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Akira Satou

Section

Research Institute of Electrical Communication

Job title

Associate Professor

Degree

博士（コンピュータ理工学）（会津大学）
修士（コンピュータ理工学）（会津大学）

researchmap

https://researchmap.jp/read0154900

J-GLOBAL ID

201101004650632852

Research History 3

2017/11 - Present

Tohoku University　Research Institute of Electrical Communication
2010/04 - 2017/10

東北大学電気通信研究所　Assistant Professor
2008/04 - 2010/03

会津大学　Assistant Lecturer

Education 2

University of Aizu　コンピュータ理工学研究科　コンピュータシステム学専攻

- 2008/03
University of Aizu　Faculty of Computer Science and Technology　ハードウェア学科

- 2003/03

Committee Memberships 10

日本光学会テラヘルツ波科学技術産学連携専門委員会　委員

2024/08 - Present
応用物理学会東北支部　幹事

2022/04 - Present
Russia-Japan-USA-Europe Symposium on Fundamental & Applied Problems in Terahertz Devices & Technologies　International Steering Committee

2016/11 - Present
電子情報通信学会マイクロ波テラヘルツ光電子技術研究専門委員会　総務幹事

2024/06 - 2026/05
電子情報通信学会エレクトロニクスソサイエティ・フォトニクス技術領域　幹事

2024/06 - 2025/05
International Conference on Solid State Devices and Materials　Member of Program Committee (Area 4)

2021/12 - 2025/03
電子情報通信学会マイクロ波テラヘルツ光電子技術研究専門委員会　幹事補佐

2022/04 - 2024/05
電子情報通信学会テラヘルツ応用システム特別研究専門委員会　副委員長

2020/06 - 2022/03
応用物理学会東北支部　庶務幹事

2020/04 - 2022/03
電子情報通信学会テラヘルツ応用システム特別研究専門委員会　幹事補佐

2019/06 - 2020/05

Show all ︎Show first 5

Professional Memberships 4

The Institute of Electronics, Information and Communication Engineers

2015/11 - Present
The Japanese Society of Applied Physics

2012/02 - Present
IEEE

2008 - Present
Applied Physics Society

2008 - Present

Research Interests 8

UTC-PD
plasmonic THz detection
optical-wireless fusion
plasmon
HEMT
graphene
プラズマ波
terahertz wave

Research Areas 4

Nanotechnology/Materials / Optical engineering and photonics /
Nanotechnology/Materials / Nanostructure physics /
Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Electronic devices and equipment /
Nanotechnology/Materials / Nano/micro-systems /

Awards 5

石田實記念財団研究奨励賞特別賞（石田實賞）

2023/10　石田實記念財団　半導体二次元プラズモンを活用した光無線融合型新原理超ブロードバンド信号処理デバイスの研究実用化
Best Poster Award

2016/08/25　IEEE NANO 2016
Outstanding Invited Talk

2014/06　RJUS TeraTech-14
研究奨励賞

2013/06　みやぎ産業科学振興基金
Young Researcher Award

2011/11　TeraNano 2011: 1st International Symposium on Terahertz Nanoscience

Papers 327

300-GHz-Band Operation of UTC-PD-Integrated HEMT Photonic Double-Mixer

Tsung-Tse Lin, Shota Horiuchi, Mitsuki Watanabe, Shinnosuke Uchigasaki, Koichi Tamura, Tetsuya Suemitsu, Taiichi Otsuji, Akira Satou

2024 49th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)　1-2　2024/09/01
Publisher: IEEE
DOI： 10.1109/irmmw-thz60956.2024.10697824 　
A fast and sensitive THz rectenna detector working with zero-bias based on the 2D Dirac-Semimetal/Insulator heterostructure

Chao Tang, Koichi Tamura, Aoi Hamada, Hiroyoshi Kudo, Shinnosuke Uchigasaki, Yuma Takida, Hiroaki Minamide, Tsung-Tse Lin, Akira Satou, Taiichi Otsuji

JSAP-Optica Joint Symposia 2024 Abstracts　18p_B2_3-18p_B2_3　2024
Publisher: Optica Publishing Group
DOI： 10.1364/jsapo.2024.18p_b2_3 　

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In this study, we developed a fast and sensitive terahertz (THz) detector using a Bi₂Se₃/h-BN heterostructure rectenna that enables detection without a cathode-anode bias. The fabrication process involved synthesizing β-Bi₂Se₃ via vapor-controlled liquid phase growth and h-BN via chemical vapor deposition [1]. The Bi₂Se₃ flake were cleaved and transferred onto a Si/SiO₂ substrate, followed by the deposition of anode electrodes and the hot transfer method to stack an h-BN flake, completing the fabrication with cathode and anode electrodes and a bow-tie antenna with metal pads. For THz detection, we employed a 0.95-THz, 500-mW-peak injection-seeded THz parametric generator (is-TPG) as the light source [2], with anode and cathode electrodes connected through a bias tee using a GSG RF probe (Fig. 1). We observed a THz photovoltage peak of 20 mV at an applied electric field of 0.25 V/nm, with a 200-ps full width at half maximum (FWHM). This resulted in a responsivity of 40 mV/W under a 50-Ω load (equivalent to 400 V/W under a 50-kΩ load) and a response time of 100 ps (equivalent to 10 Gbps) at room temperature. Remarkably, we also achieved a responsivity of 20 mV/W at zero bias with the same response speed (Fig. 2). The asymmetry in the peak photovoltage with respect to the applied bipolar electric field is attributed to the asymmetric Dirac conical dispersions of Bi₂Se₃, highlighting the potential for passive, high-speed THz detection using 2D semimetal devices.
Bi<inf>2</inf>Se<inf>3</inf>/h-BN Heterostructure Rectenna for fast and Sensitive THz Detection

Chao Tang, Koichi Tamura, Aoi Hamada, Hiroyoshi Kudo, Shinnosuke Uchigasaki, Yuma Takida, Hiroaki Minamide, Tsung Tse Lin, Akira Satou, Taiichi Otsuji

Device Research Conference - Conference Digest, DRC　2024

DOI： 10.1109/DRC61706.2024.10605270 　

ISSN： 1548-3770
Novel 3D-Rectification Mechanism of Terahertz Detection in Epitaxial Graphene Channel Transistors

Koichi Tamura, Hironobu Seki, Hiroyoshi Kudo, Shinnosuke Uchigasaki, Chao Tang, Hirokazu Fukidome, Yuma Takida, Hiroaki Minamide, Akira Satou, Taiichi Otsuji

CLEO: Science and Innovations, CLEO: S and I 2024 in Proceedings CLEO 2024, Part of Conference on Lasers and Electro-Optics　2024
Novel THz Detection Mechanism in Gate-Readout Epitaxial Graphene FET

Hiroyoshi Kudo, Koichi Tamura, Hironobu Seki, Shinnosuke Uchigasaki, Chao Tang, Hirokazu Fukidome, Yuma Takida, Hiroaki Minamide, Akira Satou, Taiichi Otsuji

International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz　2024

DOI： 10.1109/IRMMW-THz60956.2024.10697661 　

ISSN： 2162-2027

eISSN： 2162-2035
Fast and Sensitive Terahertz Detection Based on Novel Insulator/Dirac-Semimetal Heterostructures

Chao Tang, Koichi Tamura, Aoi Hamada, Hiroyoshi Kudo, Shinnosuke Uchigasaki, Yuma Takida, Hiroaki Minamide, Tsung Tse Lin, Akira Satou, Taiichi Otsuji

International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz　2024

DOI： 10.1109/IRMMW-THz60956.2024.10697591 　

ISSN： 2162-2027

eISSN： 2162-2035
THz Detection on Epitaxial Graphene FET by Photothermoelectric, Plasmonic, and Electric Field Assisting Mechanisms

Koichi Tamura, Hiroyoshi Kudo, Shinnosuke Uchigasaki, Chao Tang, Hirokazu Fukidome, Yuma Takida, Hiroaki Minamide, Akira Satou, Taiichi Otsuji

International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz　2024

DOI： 10.1109/IRMMW-THz60956.2024.10697613 　

ISSN： 2162-2027

eISSN： 2162-2035
Recent advances in the research of graphene-based 2D heterostructures for fast, sensitive terahertz detection

T. Otsuji, C. Tang, K. Tamura, A. Satou, V. Mitin, M. Shur, V. Ryzhii

Proceedings of SPIE - The International Society for Optical Engineering　13141　2024

DOI： 10.1117/12.3027799 　

ISSN： 0277-786X

eISSN： 1996-756X
Synthesis of Bi2Se3 and its application to sensitive and fast THz detection

Chao Tang, Koichi Tamura, Aoi Hamada, Hiroyoshi Kudo, Shinnosuke Uchigasaki, Yuma Takida, Hiroaki Minamide, Hirokazu Fukidome, Tsung Tse Lin, Akira Satou, Taiichi Otsuji

Proceedings of SPIE - The International Society for Optical Engineering　13141　2024

DOI： 10.1117/12.3028676 　

ISSN： 0277-786X

eISSN： 1996-756X
Novel 3D-Rectification Mechanism of Terahertz Detection in Epitaxial Graphene Channel Transistors

Koichi Tamura, Hironobu Seki, Hiroyoshi Kudo, Shinnosuke Uchigasaki, Chao Tang, Hirokazu Fukidome, Yuma Takida, Hiroaki Minamide, Akira Satou, Taiichi Otsuji

2024 Conference on Lasers and Electro-Optics, CLEO 2024　2024
Gate-readout and a 3D rectification effect for giant responsivity enhancement of asymmetric dual-grating-gate plasmonic terahertz detectors

Akira Satou, Takumi Negoro, Kenichi Narita, Tomotaka Hosotani, Koichi Tamura, Chao Tang, Tsung-Tse Lin, Paul-Etienne Retaux, Yuma Takida, Hiroaki Minamide, Tetsuya Suemitsu, Taiichi Otsuji

Nanophotonics　2023/11/09
Publisher: Walter de Gruyter GmbH
DOI： 10.1515/nanoph-2023-0256 　

ISSN： 2192-8606

eISSN： 2192-8614

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Abstract We experimentally investigated the asymmetric dual-grating-gate plasmonic terahertz (THz) detector based on an InGaAs-channel high-electron-mobility transistor (HEMT) in the gate-readout configuration. Throughout the THz pulse detection measurement on the fabricated device, we discovered a new detection mechanism called the “3D rectification effect” at the positive gate bias application, which is a cooperative effect of the plasmonic nonlinearities in the channel with the diode nonlinearity in the heterobarrier between the InGaAs channel layer and the InAlAs spacer/carrier-supply/barrier layers, resulting in a giant enhancement of the detector responsivity. We also found that an undesired long-tail waveform observed on the temporal pulse photoresponse of the device is due to trapping of carriers to the donor levels in the silicon δ-doped carrier-supply layer when they tunnel through the barrier to the gate and can be eliminated completely by introducing the so-called inverted-HEMT structure. The internal current responsivity and noise-equivalent power are estimated to be 0.49 A/W (with the equivalent voltage responsivity of 4.9 kV/W with a high output impedance of 10 kΩ) and 196 pW/√Hz at 0.8 THz. These results pave the way towards the application of the plasmonic THz detectors to beyond-5G THz wireless communication systems.
Efficient Optical-to-sub-THz Carrier Frequency Down-Conversion by UTC-PD-Integrated HEMT

Tsung-Tse Lin, Mitsuki Watanabe, Dai Nagajima, Keisuke Kasai, Masato Yoshida, Tetsuya Suemitsu, Taiichi Otsuji, Akira Satou

2023 International Topical Meeting on Microwave Photonics (MWP)　1-4　2023/10/15
Publisher: IEEE
DOI： 10.1109/mwp58203.2023.10416637 　
Utilizing High-Intensity Optical Subcarrier Signal for Conversion Gain Enhancement of a UTC-PD-Integrated HEMT Photonic Double-Mixer

T.-T. Lin, D. Nakajima, K. Nishimura, M. Watanabe, K. Kasai, M. Yoshida, T. Suemitsu, T. Otsuji, A. Satou

2023 48th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)　2023/09/17
Publisher: IEEE
DOI： 10.1109/irmmw-thz57677.2023.10299383 　
Introduction of Inverted-HEMT Structure in a Grating-Gate Plasmonic THz Detector for Drastic Improvement of the Pulse Response

K. Narita, T. Negoro, Y. Takida, H. Minamide, T. Suemitsu, T. Otsuji, A. Satou

2023 48th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)　2023/09/17
Publisher: IEEE
DOI： 10.1109/irmmw-thz57677.2023.10299025 　
Fast and Sensitive THz Detection by an Asymmetric-Dual-Grating-Gate Epitaxial-Graphene-Channel FET Due to Plasmonic and Photothermoelectric Rectification Effects

Koichi Tamura, Chao Tang, Daichi Ogiura, Kento Suwa, Hirokazu Fukidome, Yuma Takida, Hiroaki Minamide, Tetsuya Suemitsu, Taiichi Otsuji, Akira Satou

2023 Conference on Lasers and Electro-Optics, CLEO 2023　2023
Fast THz Detection by an Asymmetric-Dual-Grating-Gate Graphene-Channel FET Based on Plasmonic and Photothermoelectric Effects

Koichi Tamura, Shinnosuke Uchigasaki, Hironobu Seki, Chao Tang, Daichi Ogiura, Kento Suwa, Hirokazu Fukidome, Yuma Takida, Hiroaki Minamide, Tetsuya Suemitsu, Taiichi Otsuji, Akira Satou

International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz　2023

DOI： 10.1109/IRMMW-THz57677.2023.10299381 　

ISSN： 2162-2027

eISSN： 2162-2035
Fast and sensitive THz detection by an Asymmetric-Dual-Grating-Gate Epitaxial-Graphene-Channel FET based on plasmonic and photothermoelectric rectification effects

Koichi Tamura, Chao Tang, Daichi Ogiura, Kento Suwa, Hirokazu Fukidome, Yuma Takida, Hiroaki Minamide, Tetsuya Suemitsu, Taiichi Otsuji, Akira Satou

Proceedings of SPIE - The International Society for Optical Engineering　12683　2023

DOI： 10.1117/12.2676102 　

ISSN： 0277-786X

eISSN： 1996-756X
Conversion Gain Enhancement of a UTC-PD-Integrated HEMT Photonic Double-Mixer by High-Intensity Optical Subcarrier Signal

D. Nakajima, K. Nishimura, M. Watanabe, T. T. Lin, K. Kasai, M. Yoshida, T. Suemitsu, T. Otsuji, A. Satou

Optical Fiber Communication Conference (OFC) 2023　2023
Publisher: Optica Publishing Group
DOI： 10.1364/ofc.2023.m3d.7 　

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We experimentally investigate the effect of high-intensity subcarrier signal input to the UTC-PD-integrated HEMT working for optical-to-wireless carrier frequency down-conversion on enhancement of its double-mixing conversion gain. The fabricated UTC-PD-integrated HEMT demonstrated the linear increase in the conversion gain by up to +7 dB with increasing the subcarrier signal intensity without saturation, and the conversion gain enhancement of +6.8 dB from -51.0 dB to -44.2 dB was achieved.
Fast and sensitive terahertz detection with a current-driven epitaxial-graphene asymmetric dual-grating-gate field-effect transistor structure

Koichi Tamura, Chao Tang, Daichi Ogiura, Kento Suwa, Hirokazu Fukidome, Yuma Takida, Hiroaki Minamide, Tetsuya Suemitsu, Taiichi Otsuji, Akira Satou

APL Photonics　7　(12)　126101-126101　2022/12/01
Publisher: AIP Publishing
DOI： 10.1063/5.0122305 　

eISSN： 2378-0967

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We designed and fabricated an epitaxial-graphene-channel field-effect transistor (EG-FET) featuring an asymmetric dual-grating-gate (ADGG) structure working as a current-driven terahertz detector and experimentally demonstrated a 10 ps-order fast response time and a high responsivity of 0.3 mA/W to 0.95 Terahertz (THz) radiation incidence at room temperature. The ADGG and drain–source bias dependencies of the measured photoresponse showed a clear transition between plasmonic detection under periodic electron density modulation conditions with depleted regions and photothermoelectric (PTE) detection under entirely highly doped conditions without depleted regions. We identified the PTE detection that we observed as a new type of unipolar mechanism in which only electrons or holes contribute to rectifying THz radiation under current-driven conditions. These two detection mechanisms coexisted over a certain wide transcendent range of the applied bias voltages. The temporal photoresponses of the plasmonic and PTE detections were clearly shown to be comparably fast on the order of 10 ps, whereas the maximal photoresponsivity of the PTE detection was almost twice as high as that of the plasmonic detection under applied bias conditions. These results suggest that the ADGG-EG-FET THz detector will be promising for use in 6G- and 7G-class high-speed wireless communication systems.
Recent progress in the development of grating-gate InGaAs-channel HEMTs for fast and sensitive THz detection

Akira Satou, Taiichi Otsuji

Terahertz Emitters, Receivers, and Applications XIII　2022/09/30
Publisher: SPIE
DOI： 10.1117/12.2633618 　
Discovery of Coulomb-Drag Instability of Graphene Dirac Plasmons

V. Ryzhii, M. Ryzhii, A. Satou, V. Mitin, M.S. Shur, T. Otsuji

2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)　2022/08/28
Publisher: IEEE
DOI： 10.1109/irmmw-thz50927.2022.9966853 　
UTC-PD-Integrated HEMT for Optical-to-MMW/THz Carrier Frequency Down-Conversion: Scaling Rule of Conversion Gain on UTC-PD Mesa Size

D. Nakajima, K. Nishimura, T. Hosotani, K. Kasai, M. Yoshida, T. Suemitsu, T. Otsuji, A. Satou

2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)　2022/08/28
Publisher: IEEE
DOI： 10.1109/irmmw-thz50927.2022.9895988 　
Pulse Response of Asymmetric Dual-Grating-Gate HEMT Plasmonic THz Detector

K. Narita, T. Negoro, Y. Takida, H. Ito, H. Minamide, T. Suemitsu, T. Otsuji, A. Satou

2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)　2022/08/28
Publisher: IEEE
DOI： 10.1109/irmmw-thz50927.2022.9895931 　
Recent Advances of Grating-Gate Transistors for Fast, Sensitive, Room-Temperature Plasmonic Terahertz Detection

Akira Satou, Taiichi Otsuji

2022 IEEE Photonics Society Summer Topicals Meeting Series (SUM)　2022/07
Publisher: IEEE
DOI： 10.1109/sum53465.2022.9858286 　
Controlling the PT symmetry of Dirac plasmons in dual-grating-gate graphene THz laser transistors for ultrafast gain switching International-journal Peer-reviewed

Taiichi Otsuji, Akira Satou, Hirokazu Fukidome, Maxim Ryzhii, Victor Ryzhii, Koichi Narahara

CLEO: Conference on Lasers and Electro-Optics 2022　1　(1)　1-2　2022/05/19

DOI： 10.1364/CLEO_AT.2022.JTh3B.10 　
Graphene-based plasmonic metamaterial for terahertz laser transistors

Taiichi Otsuji, Stephane Albon Boubanga-Tombet, Akira Satou, Deepika Yadav, Hirokazu Fukidome, Takayuki Watanabe, Tetsuya Suemitsu, Alexander A. Dubinov, Vyacheslav V. Popov, Wojciech Knap, Valentin Kachorovskii, Koichi Narahara, Maxim Ryzhii, Vladimir Mitin, Michael S. Shur, Victor Ryzhii

Nanophotonics　11　(9)　1677-1696　2022/05/11
Publisher: Walter de Gruyter GmbH
DOI： 10.1515/nanoph-2021-0651 　

eISSN： 2192-8614

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Abstract This paper reviews recent advances in the research and development of graphene-based plasmonic metamaterials for terahertz (THz) laser transistors. The authors’ theoretical discovery on THz laser transistors in 2007 was realized as a distributed-feedback dual-gate graphene-channel field-effect transistor (DFB-DG-GFET) in 2018, demonstrating ∼0.1 µW single-mode emission at 5.2 THz and ∼80 µW amplified spontaneous 1–7.6 THz emission at 100 K. To realize room-temperature, dry-cell-battery operating intense THz lasing with fast direct modulation, various approaches based on graphene plasmonic metamaterials are investigated and introduced as real device implementations, including (i) replacement of the laser photonic cavity with plasmonic cavity enormously improving the THz photon field confinement with larger gain overlapping, (ii) introduction of THz amplification of stimulated emission via current-driven graphene Dirac plasmons (GDPs), and (iii) controlling the parity and time-reversal symmetry of GDPs enabling ultrafast direct gain-switch modulation. Possible real device structures and design constraints are discussed and addressed toward coherent light sources applicable to future 6G- and 7G-class THz wireless communication systems.
Ballistic Injection Terahertz Plasma Instability in Graphene n + -i-n-n + Field-Effect Transistors and Lateral Diodes

V. Ryzhii, M. Ryzhii, A. Satou, V. Mitin, M.S. Shur, T. Otsuji

Physica Status Solidi A: Appl. and Mat. Sci.　219　(1)　2100694-1-2100694-8　2022/01

DOI： 10.1002/pssa.202100694 　
Effect of Coulomb carrier drag and terahertz plasma instability in p+-p-i-n-n+ graphene tunneling transistor structures

V. Ryzhii, M. Ryzhii, A. Satou, T. Otsuji, V. Mitin, M.S. Shur

Phys. Rev. Appl.　16　064054-1-064054-10　2021/12

DOI： 10.1103/PhysRevApplied.16.064054 　
Paving the Way for Tunable Graphene Plasmonic THz Amplifiers

Stephane A. Boubanga-Tombet, Akira Satou, Deepika Yadav, Dmitro B. But, Wojciech Knap, Vyacheslav V. Popov, Ilya V. Gorbenko, Valentin Kachorovskii, Taiichi Otsuji

Frontiers in Physics　9　2021/10/04
Publisher: Frontiers Media SA
DOI： 10.3389/fphy.2021.726806 　

eISSN： 2296-424X

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This study reviews recent advances in room-temperature coherent amplification of terahertz (THz) radiation in graphene, electrically driven by a dry cell battery. Our study explores THz light–plasmon coupling, light absorption, and amplification using a current-driven graphene-based system because of its excellent room temperature electrical and optical properties. An efficient method to exploit graphene Dirac plasmons (GDPs) for light generation and amplification is introduced. This approach is based on current-driven excitation of the GDPs in a dual-grating-gate high-mobility graphene channel field-effect transistor (DGG-GFET) structure. The temporal response of the DGG-GFETs to the polarization-managed incident THz pulsation is experimentally observed by using THz time-domain spectroscopy. Their Fourier spectra of the transmitted temporal waveform through the GDPs reveals the device functions 1) resonant absorption at low drain bias voltages below the first threshold level, 2) perfect transparency between the first and the second threshold drain bias levels, and 3) resonant amplification beyond the second threshold drain bias voltage. The maximal gain of 9% is obtained by a monolayer graphene at room temperatures, which is four times higher than the quantum limit that is given when THz photons directly interact with electrons. The results pave the way toward tunable graphene plasmonic THz amplifiers.
Modal Analysis of Plasmon-Polaritons in Plasmonic THz Detector Integrated with Two-Dimensional Nano-Antennas

Yuma Sasaki, Taiichi Otsuji, Akira Satou

2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)　2021/08/29
Publisher: IEEE
DOI： 10.1109/irmmw-thz50926.2021.9567237 　
3D Rectification Effect on Plasmonic THz Detection by InP-Based Dual-Grating-Gate High-Electron-Mobility Transistor

T. Negoro, T. Hosotani, Y. Takida, H. Ito, H. Minamide, T. Otsuji, A. Satou

2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)　2021/08/29
Publisher: IEEE
DOI： 10.1109/irmmw-thz50926.2021.9567650 　
THz Emission in a Dual-Grating-Gate HEMT Promoted by the Plasmonic Boom Instability

Tomotaka Hosotani, Akira Satou, Taiichi Otsuji

2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)　2021/08/29
Publisher: IEEE
DOI： 10.1109/irmmw-thz50926.2021.9567205 　
1-THz plasmonic double-mixing in a dual-grating-gate high-electronmobility transistor International-journal Peer-reviewed

T. Hosotani, A. Satou, Y. Takida, H. Ito, H. Minamide, T. Otsuji

CLEO-EU: International Conference on Lasers and Electro-Optics Europe Tech. Dig., CC-6.2, Web-Online, June 25, 2021.　1　(1)　1-2　2021/06/25
Publisher: Optica Publishing Corp.
DOI： 10.1109/CLEO/Europe-EQEC52157.2021.9541826 　
Optical-to-Wireless Carrier Frequency Down-Conversion by UTC-PD-Integrated HEMT: Dependence of Conversion Gain on UTC-PD Mesa Size International-journal Peer-reviewed

Kazuki Nishimura, Tomotaka Hosotani, Dai Nakajima, Tetsuya Suemitsu, Katsumi Iwatsuki, Taiichi Otsuji, Akira Satou

CLEO-EU: International Conference on Lasers and Electro-Optics Europe Tech. Dig., CI-3.5, vol. 1, pp. 1-2, Web-Online, June 24, 2021.　1　(1)　1-2　2021/06/24
Publisher: Optica Publishing Corp.
DOI： 10.1109/CLEO/Europe-EQEC52157.2021.9542735 　
Fast terahertz detection by asymmetric dual-grating-gate graphene FET

Koichi Tamura, Daichi Ogiura, Kento Suwa, Hirokazu Fukidome, Akira Satou, Yuma Takida, Hiroaki Minamide, Taiichi Otsuji

2021 Device Research Conference (DRC)　2021/06/20
Publisher: IEEE
DOI： 10.1109/drc52342.2021.9467191 　
Unitraveling-Carrier-Photodiode-Integrated High-Electron-Mobility Transistor for Photonic Double-Mixing

Akira Satou, Yuya Omori, Kazuki Nishimura, Tomotaka Hosotani, Katsumi Iwatsuki, Tetsuya Suemitsu, Taiichi Otsuji

Journal of Lightwave Technology　39　(10)　3341-3349　2021/05/15
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
DOI： 10.1109/jlt.2021.3060795 　

ISSN： 0733-8724

eISSN： 1558-2213
Terahertz emission in an InGaAs-based dual-grating-gate high-electron-mobility transistor plasmonic photomixer

Tomotaka Hosotani, Akira Satou, Taiichi Otsuji

Applied Physics Express　14　(5)　051001-051001　2021/05/01
Publisher: IOP Publishing
DOI： 10.35848/1882-0786/abf02a 　

ISSN： 1882-0778

eISSN： 1882-0786
Bias voltage dependency of plasmonic instability and terahertz radiation in a dual-grating-gate high-electron-mobility transistor

Tomotaka Hosotani, Akira Satou, Taiichi Otsuji

Optics InfoBase Conference Papers　2021
Publisher: The Optical Society
Terahertz Emission in an Asymmetric Dual-Grating-Gate High-Electron Mobility Transistor Plasmonic Photomixer under dc Current Flow

Tomotaka Hosotan, Akira Satou, Taiichi Otsuji

2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)　2020/11/08
Publisher: IEEE
DOI： 10.1109/irmmw-thz46771.2020.9370536 　
Gate-Readout of Photovoltage from a Grating-Gate Plasmonic THz Detector

Takumi Negoro, Taku Saito, Tomotaka Hosotani, Taiichi Otsuji, Yuma Takida, Hiromasa Ito, Hiroaki Minamide, Akira Satou

2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)　2020/11/08
Publisher: IEEE
DOI： 10.1109/irmmw-thz46771.2020.9370627 　
Room temperature amplification of terahertz radiation by grating-gate graphene structures

S. Boubanga-Tombet, W. Knap, D. Yadav, A. Satou, D.B. But, V.V. Popov, I.V. Gorbenko, V. Kachorovskii, T. Otsuji

Phys. Rev. X　10　(3)　031004-1-031004-19　2020/07

DOI： 10.1103/PhysRevX.10.031004 　
Electrical Transport Properties of Gate Tunable Graphene Lateral Tunnel Diodes

K. Shiga, T. Komiyama, Y. Fuse, H. Fukidome, A. Satou, T. Otsuji, T. Uchino

Jpn. J. Appl. Phys.　59　(SI)　SIID03-1-SIID03-6　2020/04

DOI： 10.35848/1347-4065/ab83de 　

ISSN： 0021-4922

eISSN： 1347-4065
格子ゲート構造プラズモニックTHz検出素子におけるゲート電極からの光起電圧出力に関する検討 Peer-reviewed

根来拓海,齋藤琢,鈴木雅也,細谷友崇,末光哲也,瀧田佑馬,伊藤弘昌,南出泰亜,尾辻泰一,佐藤昭

第67回応用物理学会春季学術講演会　1　(1)　12a-B414-8　2020/03/12
光吸収層面積縮小によるUTC-PD集積HEMTの光ダブルミキシング効率向上 Peer-reviewed

西村和樹,大森雄也,細谷友崇,岩月勝美,末光哲也,尾辻泰一,佐藤昭

第67回応用物理学会春季学術講演会　1　(1)　12a-B414-7　2020/03/12
UTC-PD-integrated HEMT for optical-to-sub-terahertz carrier frequency down-conversion

A. Satou, K. Nishimura, Y. Omori, T. Hosotani, K. Iwatsuki, T. Otsuji

Proceedings of SPIE - The International Society for Optical Engineering　11390　2020
Publisher: SPIE
DOI： 10.1117/12.2557170 　

ISSN： 1996-756X 0277-786X
Terahertz gain and amplification in current-driven metasurfaces of graphene Dirac plasmons

S. A. Boubanga-Tombet, D. Yadav, A. Satou, W. Knap, V. V. Popov, T. Otsuji

Proceedings of SPIE - The International Society for Optical Engineering　11348　2020
Publisher: SPIE
DOI： 10.1117/12.2559504 　

ISSN： 1996-756X 0277-786X
光励起多層グラフェンにおける広帯域テラヘルツ光放射の観測 Peer-reviewed

込山貴大, 渡辺隆之, Sergey Morozov, Mikhail Fadeev, Vladimir Utochkin, 吹留博一, 佐藤昭, 尾辻泰一

信学技報　119　(353)　17-20　2019/12/23
格子ゲート構造プラズモニックTHzディテクタのゲート電極からの光電流出力に関する検討 Peer-reviewed

齋藤琢, 鈴木雅也, 細谷友崇, 尾辻泰一, 瀧田佑馬, 伊藤弘昌, 南出泰亜, 佐藤昭

信学技報　119　(353)　49-52　2019/12/23
Realization of the high-performance graphene transistor by controlling the interface between graphene and gate dielectric International-journal Peer-reviewed

T. Komiyama, T. Watanabe, S. Morozov, M. Fadeev, V. Utochkin, H. Fukidome, A. Satou, andT. Otsuji

RPGR2019: Recent Progress on Graphene and 2D Materials Abstracts　1　(1)　7P-40　2019/10/07
Terahertz Light Amplification and Lasing in Current-Driven Graphene-Channel Transistor Structures International-journal Invited Peer-reviewed

S. Boubanga-Tombet, D. Yadav, A. Satou, W. Knap, V.V. Popov, T. Otsuji

2D MATERIALS 2019 - International Congress on Graphene, 2D Materials and Applications Abstracts, Sochi Olympic Park, Sochi, Russia,　1　(1)　1-2　2019/09/30
Gate electrode as an putput port of a grating-gate plasmonic THz detector International-journal Peer-reviewed

Taku Saito, Masaya Suzuki, Tomotaka Hosotani, Taiichi Otsuji, Y. Takida, H. Ito, H. Minamide, Akira Satou

MTSA2019: The 5th International Symposium on Microwave/Terahertz Science and Applications Abstracts, Hanwha Resorts Haeundae Tivoli, Busan, Korea,　1　(1)　Bp1-4　2019/09/30
Terahertz plasmonic graphene-channel transistor laser International-journal Peer-reviewed

Y. Fuse, A. A. Dubinov, T. Watanabe, V. Ya. Aleshkin, S. V. Morozov, A. Satou, V. Ryzhii, T. Otsuji

MTSA2019: The 5th International Symposium on Microwave/Terahertz Science and Applications Abstracts, Hanwha Resorts Haeundae Tivoli, Busan, Korea,　1　(1)　Ap2-4　2019/09/30
Graphene for Room-Temperature Operating Terahertz Coherent Light Sources International-journal Peer-reviewed

A. Satou and T. Otsuji

MTSA2019: The 5th International Symposium on Microwave/Terahertz Science and Applications Abstracts, Hanwha Resorts Haeundae Tivoli, Busan, Korea,　1　(1)　Mo-P3-m-3　2019/09/29
UTC-PD 集積 HEMT による光ミリ波キャリア周波数下方変換 Peer-reviewed

佐藤昭, 大森雄也, 西村和樹, 細谷友崇, 岩月勝美, 末光哲也, 尾辻泰一

2019年電子情報通信学会ソサエティ大会　1　(1)　CI-2-6　2019/09/10
Terahertz emission from an asymmetric dual-grating-gate InGaAs high-electron-mobility transistor stimulated by plasmonic boom instability International-journal Peer-reviewed

T. Hosotani, T. Watanabe, A. Satou, T. Otsuji

IRMMW-THz2019: International Conference on Infrared, Millimeter, and Terahertz Waves Abstracts Book, Paris, France,　1　(1)　Th-AM-6-3-1-3　2019/09/02

DOI： 10.1109/IRMMW-THz.2019.8874584 　
Optical-to-THz frequency down-conversion utilizing two-dimensional plasmons International-journal Peer-reviewed

S. Manabe, T. Otsuji, A. Satou

IRMMW-THz2019: International Conference on Infrared, Millimeter, and Terahertz Waves Abstracts Book, Paris, France,　1　(1)　We-PM2-3-2-1-3　2019/09/02

DOI： 10.1109/IRMMW-THz.2019.8873711 　
Photonic Double-Mixing by UTC-PD-Integrated-HEMT for Optical to MMW Carrier Frequency Down-Conversion International-journal Peer-reviewed

K. Nishimura, Y. Omori, T. Hosotani, T. Suemitsu, K. Iwatsuki, T. Otsuji, A. Satou

TWHM2019: 13th Topical Workshop on Heterostructure Microelectronics Abstracts Book, Hotel Grand Terrace Toyama, Toyama, Japan,　1　(1)　6.6-2-1-2　2019/08/26
Graphene-based van der Waals heterostructures towards a new type of terahertz quantum-cascade lasers International-journal Invited Peer-reviewed

T. Watanabe, D. Yadav, S. Boubanga-Tombet, A. Satou, A.A. Dubinov, V. Ryzhii, T. Otsuj

Proc. SPIE [SPIE OPTICS+ Phootnics, Conf. OP412: Terahertz Emitters, Receivers, and Applications X, San Diego Convention Center, San Diego, CA, USA]　11124　1112406-1-7　2019/08/11

DOI： 10.1117/12.2529016 　
Current-driven plasmonic instability in graphene metasurfaces for terahertz applications International-journal Peer-reviewed

S. Boubanga-Tombet, D. Yadav, A. Satou, W. Knap, V.V. Popov, T. Otsuji

META2019: the 10th International Conference on Metamaterials, Photonic Crystals and Plasmonics　1　(1)　2A36-6　2019/07/23
Current-driven plasmonic instability in graphene metasurfaces for terahertz applications International-journal Peer-reviewed

S. Boubanga-Tombet, D. Yadav, A. Satou, W. Knap, V.V. Popov, T. Otsuji

AES2019: the 7th Advanced Electromagnetics Symposium　1　(1)　1A6-1　2019/07/23
Integration of UTC-PD structure with InGaAs HEMT for optical-to-wireless carrier frequency down-conversion International-journal Peer-reviewed

K. Nishimura, Y. Omori, T. Hosotani, T. Suemitsu, K. Iwatsuki, T. Otsuji, A. Satou

RJUSE2019: 8th Russia-Japan-USA-Europe Symposium on Fundamental & Applied Problems of Terahertz Devices & Technologies, & GDR-I FIR-LAB Workshop Dig., Nizhny Novgorod, Russia,　1　(1)　P-6-1-2　2019/07/08
Terahertz photoluminescence from narrow gap HgTe/CdHgTe heterostructures and multilayer graphene International-journal Peer-reviewed

V.V. Utochkin, S.V. Morozov, M.A. Fadeev, V.V. Rumyantsev, N.N. Mikhailov, S.A. Dvoretsky, T. Komiyama, T. Watanabe, H. Fukidome, A. Satou, T. Otsuji

RJUSE2019: 8th Russia-Japan-USA-Europe Symposium on Fundamental & Applied Problems of Terahertz Devices & Technologies, & GDR-I FIR-LAB Workshop Dig., Nizhny Novgorod, Russia,　1　(1)　P-13-1-2　2019/07/08
Terahertz light amplification stimulated by current-driven plasmon instability in graphene-channel transistors International-journal Peer-reviewed

S. Boubanga-Tombet, W. Knap, A. Satou, D. But, V.V. Popov, and T. Otsuji

GSMM: the 12th Global Symposium onMillimeter Waves　1　(1)　2019/05/22
Optical-to-millimeter-wave carrier frequency down-conversion by UTC-PD-integrated HEMT International-journal Peer-reviewed

Y. Omori, T. Hosotani, T. Otsuji, K. Iwatsuki, A. Satou

CSW: Compound Semiconductor Week Dig., Nara, Japan,　1　(1)　WeE2-4-1-2　2019/05/19
Terahertz light amplification of stimulated emission of radiation in current-injection graphene channel transistor International-journal Invited Peer-reviewed

S. Boubanga-Tombet, D. Yadav, T. Watanabe, A. Satou, W. Knap, V.V. Popov, V. Ryzhii, T. Otsuji

Proc. SPIE [SPIE International Conference on Defence+ Commercial Sensing, Conference 10982 on Micro- and Nanotechnology Sensors, Systems, and Applications XI, Baltimore Convention Center, Baltimore, Maryland, USA]　10982　109822V-1-6　2019/04/14

DOI： 10.1117/12.2520092 　
Terahertz light amplification stimulated by current-driven plasmon instability in grating-gate graphene transistor structures International-journal Invited Peer-reviewed

S. Boubanga-Tombet, W. Knap, D. Yadav, A. Satou, D. but, V.V. Popov, T. Otsuji

FGTC: French-German Terahertz Conference 2019 Dig., Kaiserslautern, Germany,　1　(1)　1　2019/04/02
Millimeter-wave photonic double-mixing by InGaAs-HEMTs for optical to wireless carrier frequency down-conversion International-journal Invited Peer-reviewed

A. Satou, Y. Omori, S. Manabe, T. Hosotani, K. Iwatsuki, T. Otsuji

The 23rd International Symposium on Nanophysics and Nanoelectronics Dig., Nizhny Novgorod, Russia,　1　(1)　1　2019/03/11
UTC-PD-integrated HEMT for optical-to-millimeter-wave carrier frequency down-conversion International-journal Peer-reviewed

Y. Omori, T. Hosotani, T. Otsuji, K. Iwatsuki, A. Satou

OFC: Optical Fiber Conference Dig., San Diego, CA, USA,　1　(1)　Th3B.5-1-3　2019/03/06

DOI： 10.1364/OFC.2019.Th3B.5 　
Introduction of 2D nanoantennas to grating-gate plasmonic THz detector for controlling Its polarization characteristics International-journal Peer-reviewed

M. Suzuki, T. Hosotani, T. Suemitsu, Y. Takida, H. Ito, H. Minamide, T. Otsuji, and A. Satou

OTST: Optical Terahertz Science and Technology Dig.　1　(1)　Tu-P-13　2019/02/12
Graphene-based 2D-heterostructures for terahertz lasers and amplifiers International-journal Invited Peer-reviewed

D. Yadav, S. Boubanga-Tombet, A. Satou, T. Tamamushi, T. Watanabe, T. Suemitsu, H. Fukidome, M. Suemitsu, A. A. Dubinov, V. V. Popov, M. Ryzhii, V. Mitin, M. S. Shur, V. Ryzhii, T. Otsuji

Proc. SPIE [SPIE Photonics West, Conference 10917: Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XII, San Fransisco, CA, USA]　10917　109170G-1-10　2019/02/05

DOI： 10.1117/12.2516494 　

ISSN： 0277-786X

eISSN： 1996-756X
横型グラフェントンネルダイオードにおけるゲート電界効果の解析 Peer-reviewed

志賀佳菜子, 菅原健太, 佐藤昭, 吹留博一, 尾辻泰一, 内野俊

第66回応用物理学会春季学術講演会　1　(1)　10a-W521-6　2019
二次元プラズモンを用いたテラヘルツ帯光-無線周波数下方変換の理論解析 Peer-reviewed

眞鍋颯也, 尾辻泰一, 佐藤昭

第66回応用物理学会春季学術講演会　1　(1)　11a-S421-7　2019
二次元ナノアンテナ導入による格子ゲート構造プラズモニックTHzディテクタの偏光特性制御 Peer-reviewed

鈴木雅也, 細谷友崇, 末光哲也, 瀧田佑馬, 伊藤弘昌, 南出泰亜, 尾辻泰一, 佐藤昭

第66回応用物理学会春季学術講演会　1　(1)　11a-S421-8　2019
格子ゲート構造プラズモニックTHzディテクタの偏光特性制御のための二次元ナノアンテナ導入 Peer-reviewed

鈴木雅也, 細谷友崇, 末光哲也, 瀧田佑馬, 伊藤弘昌, 南出泰亜, 尾辻泰一, 佐藤昭

信学技報　118　(368)　43-46　2018/12/17
Fabrication of Gate Tunable Graphene Lateral Tunnel Diodes International-journal Peer-reviewed

T. Uchino, K. Shiga, K. Sugawara, H. Fukidome, A. Satou, T. Otsuji

2018 MRS Fall Meeting Dig., Hynes Convention Center, Boston, MA, USA,　1　(1)　NM01.07.16　2018/11/27
Terahertz current-driven plasmonic lasing and amplification International-journal Invited Peer-reviewed

D. Yadav, S. Boubanga-Tombet, G. Tamamushi, T. Watanabe, A. Satou, A. Dubinov, M. Ryzhii, V. Ryzhii, T. Otsuji

WINDS 18: International Workshop on Innovative Nanoscale Devices and Systems Book of Abstracts, Westin Hapuna Beach Resort, Hawaii, USA,　1　(1)　72　2018/11/25
Photonic double-mixing by InGas-HEMTs for optical to MMW-THz carrier frequency down-conversion International-journal Invited Peer-reviewed

A. Satou, Y. Omori, S. Manabe, T. Hosotani, T. Suemitsu, T. Otsuji\\, hi

ICMNE-2018: International Conference on Nano- and Micro-Electronics Book of Abstracts, the Park-Hotel “Ershovo” in Zvenigorod, Moscow Region, Russia,　1　(1)　44　2018/10/01
Graphene-based 2D heterostructures for terahertz photonic and plasmonic light-sources applications International-journal Invited Peer-reviewed

D. Yadav, T. Watanabe, S. Boubanga-Tombet, A. Satou, V. Ryzhii, M. Ryzhii, A.A. Dubinov, W. Knap, V.V. Popov, T. Otsuji

ICMNE-2018: International Conference on Nano- and Micro-Electronics Book of Abstracts, the Park-Hotel “Ershovo” in Zvenigorod, Moscow Region, Russia,　1　(1)　42　2018/10/01
ALD-Al2O3を用いた横型グラフェントンネルダイオードの作製 Peer-reviewed

志賀佳菜子, 菅原健太, 佐藤昭, 吹留博一, 尾辻泰一, 内野俊

第79回応用物理学会秋季学術講演会　1　(1)　18p-PB3-47　2018/09/18
2D diffraction grating for controlling polarization characteristics of grating-gate plasmonic THz detector International-journal Peer-reviewed

M. Suzuki, T. Hosotani, T. Otsuji, T. Suemitsu, Y. Takida, H. Ito, H. Minamide, A. Satou

RJUSE: the 7th Russia-Japan-USA-Europe Symposium on Fundamental & Applied Problems of Terahertz Devices & Technologies Book of Abstracts, CBF Nowy Swiat, Warsaw, Poland,　1　(1)　130-131　2018/09/17
Emission and amplification of terahertz radiation using Dirac fermions and plasmons in graphene International-journal Invited Peer-reviewed

T. Otsuji, D. Yadav, S. Boubanta-Tombet, T. Watanabe, A. Satou, A.A. Dubinov, M. Ryzhii, V.V. Popov, W. Knap, V. Mitin, M.S. Shur, V. Ryzhii

RJUSE: the 7th Russia-Japan-USA-Europe Symposium on Fundamental & Applied Problems of Terahertz Devices & Technologies Book of Abstracts, CBF Nowy Swiat, Warsaw, Poland,　1　(1)　128-129　2018/09/17
Carrier frequency down-conversion from optical to MMW/THz data signal using InGaAs-HEMT International-journal Invited Peer-reviewed

A. Satou, Y. Ohmori, S. Manabe, T. Hosotani, T. Suemitsu, T. Otsuji

RJUSE: the 7th Russia-Japan-USA-Europe Symposium on Fundamental & Applied Problems of Terahertz Devices & Technologies Book of Abstracts, CBF Nowy Swiat, Warsaw, Poland,　1　(1)　70-72　2018/09/17
UTC-PD構造を集積したInP-HEMTによる光-ミリ波帯周波数下方変換 Peer-reviewed

大森雄也, 細谷友崇, 末光哲也, 尾辻泰一, 佐藤昭

2018年信学会ソサエティ大会　1　(1)　C-14-9　2018/09/11
Coupling of 2D plasmons in grating-gate plasmonic THz detector to THz wave with lateral polarization International-journal Peer-reviewed

M. Suzuki, T. Hosotani, T. Otsuji, T. Suemitsu, Y. Takida, H. Ito, H. Minamide, A. Satou

IRMMW-THz: the 43rd International Conference on Infrared, Millimeter and Terahertz Waves Dig., Nagoya, Aichi, Japan,　1　(1)　Tu-A2-1a-2-1-2　2018/09/09

DOI： 10.1109/IRMMW-THz.2018.8510281 　
Introduction of 2D Diffraction Grating into Grating-Gate Plasmonic THz Detector for Controlling Its Polarization Characteristics International-journal Peer-reviewed

M. Suzuki, T. Hosotani, T. Otsuji, T. Suemitsu, Y. Takida, H. Ito, H. Minamide, A. Satou

AWAD 2018: the 26th Asia-Pacific Workshop on Fundamentals and Applications of Advanced Semiconductor Devices Dig., Kitakyushu, Japan,　1　(1)　1-2　2018/07/02
Auger recombination in Dirac materials: A tangle of many-body effects Peer-reviewed

Georgy Alymov, Vladimir Vyurkov, Victor Ryzhii, Akira Satou, Dmitry Svintsov

Physical Review B　97　(20)　2018/05/08
Publisher: American Physical Society
DOI： 10.1103/PhysRevB.97.205411 　

ISSN： 2469-9969 2469-9950

eISSN： 2469-9969
Terahertz light emission and lasing in current-injection graphene-channel transistors International-journal Invited Peer-reviewed

D. Yadav, T. Watanabe, A. Satou, M. Ryzhii, V. Ryzhii, T. Otsuji

2nd Edition of Graphene & Semiconductors | Diamond, Graphite & Carbon Materials Conference Abstracts, Las Vegas, NV, USA, April 16-17, 2018.　1　(1)　43　2018/04/16

DOI： 10.4172/2169-0022-C3-097 　
Terahertz light-emitting graphene-channel transistor toward single-mode lasing Peer-reviewed

Deepika Yadav, Gen Tamamushi, Takayuki Watanabe, Junki Mitsushio, Youssef Tobah, Kenta Sugawara, Alexander A. Dubinov, Akira Satou, Maxim Ryzhii, Victor Ryzhii, Taiichi Otsuji

Nanophotonics　7　(4)　741-752　2018/03/28
Publisher: Walter de Gruyter GmbH
DOI： 10.1515/nanoph-2017-0106 　

ISSN： 2192-8614

eISSN： 2192-8614
Auger Recombination in Graphene with Spectral Broadening and Renormalization by Electron-Electron Interaction International-journal Peer-reviewed

A. Satou, V. Ryzhii, V. Vyurkov, G. Alymov, and D. Svintsov

PIERS: Progress in Electromagnetics Research Symposium　1　(1)　4A14-1I　2018
Optical-to-MMW carrier-frequency down-conversion by InP-HEMT

Y. Omori, T. Hosotani, T. Otsuji, K. Iwatsuki, T. Suemitsu, K. Higuma, J. Ichikawa, T. Sakamoto, N. Yamamoto, A. Satou

IEICE Technical Report　117　(ED2017-83)　41-45　2017/12/24
Terahertz light emission and lasing in graphene-based van der Waals 2D heterostructures International-journal Invited Peer-reviewed

D. Yadav, T. Watanabe, S. boubanga-Tombet, A. Satou, V. Ryzhii, T. Otsuji

WINDS17: 16: 2017 International Workshop on Innovative Nanoscale Devices and Systems Abstracts, Big Island Hawaii, USA, Nov 26 - Dec. 1, 2017.　1　(1)　S3.3.1-2　2017/11/26
High-speed pulse response of asymmetric-dual-grating-gate high-electron-mobility-transistor for plasmonic THz detection International-journal Peer-reviewed

T. Hosotani, F. Kasuya, M. Suzuki, T. Suemitsu, T. Otsuji, Y. Takida, H. Ito, H. Minamide, T. Ishibashi, M. Shimizu, A. Satou

International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz　1　(1)　IV-O2　2017/10/12
Publisher: IEEE Computer Society
DOI： 10.1109/IRMMW-THz.2017.8066947 　

ISSN： 2162-2035 2162-2027
Lens-integrated asymmetric-dual-grating-gate high-electron-mobility-transistor for plasmonic terahertz detection International-journal Peer-reviewed

Tomotaka Hosotani, Fuzuki Kasuya, Hiroki Taniguchi, Takayuki Watanabe, Tetsuya Suemitsu, Taiichi Otsuji, Tadao Ishibashi, Makoto Shimizu, Akira Satou

IEEE MTT-S International Microwave Symposium Digest　1　(1)　578-581　2017/10/04
Publisher: Institute of Electrical and Electronics Engineers Inc.
DOI： 10.1109/MWSYM.2017.8058632 　

ISSN： 0149-645X
Terahertz light emission and lasing in graphene transistors under current-injection pumping International-journal Invited Peer-reviewed

T. Otsuji, D. Yadav, T. Watanabe, S. Boubanga-Tombet, A. Satou, T. Suemitsu, V. Ryzhii, A.A. Dubinov, M. Ryzhii, V. Mitin, M.S. Shur

RJUSE TeraTech 2017: Russia-Japan-USA-Europe Symposium on Fundamental & Applied Problems of Terahertz Devices & Technologies, Rensselaer Polytechnic Institute, Troy, NY, USA, Oct. 1-5, 2017.　1　(1)　I-P2　2017/10/01
Frequency down-conversion from optical data signal to MMW IF data signal using InP-HEMT International-journal Peer-reviewed

Y. Omori, T. Hosotani, T. Suemitsu, K. Iwatsuki, T. Otsuji, A. Satou

The 24th Congress of the International Commissions for Optics Dig., Keio-Plaza Hotel, Tokyo, 21-25 Aug. 2017.　1　(1)　Tu2G-05-1-2　2017/08/21
Millimeter-Wave/Terahertz Detection and Photonic Double-Mixing By Transistors International-journal Invited Peer-reviewed

A. Satou, T. Otsuji

INFRARED REMOTE SENSING AND INSTRUMENTATION XXV　10403　104030S1-12　2017/08/06

DOI： 10.1117/12.2275531 　

ISSN： 0277-786X

eISSN： 1996-756X
Temperature-Dependent Broadening of Carrier Energy Dispersion in Graphene by Electron-Electron Interaction and Its Effect on Auger Scatterings International-journal Peer-reviewed

T. Komatsu, V. Ryzhii, T. Otsuji, D. Svintsov, A. Satou

The 20th International Conference on Electron Dynamics in Semiconductors, Optoelectronics and Nanostructures (EDISON 20) Dig., University at Buffalo, Buffalo, NY, USA, 17-21 July, 2017.　1　(1)　MoP23　2017/07/17
MMW Photonic Double-Mixing and THz Plasmonic Detection Using InP HEMTs International-journal Invited Peer-reviewed

A. Satou, T. Otsuji

Global Symposium on Lasers, Optics, and Photonics Abst., Valencia, Spain, June 19-21, 2017.　1　(1)　S1-3　2017/06/19
Numerical Characterization of Dyakonov-Shur Instability in Gated Two-Dimensional Electron Systems Peer-reviewed

Akira Satou, Koichi Narahara

Fundamental and Applied Problems of Terahertz Devices and Technologies　2017/05

DOI： 10.1142/9789813223288_0014 　

ISSN： 1793-1274
Plasmonic Enhancement of Terahertz Devices Efficiency Peer-reviewed

Vladimir Mitin, Victor Ryzhii, Maxim Ryzhii, Akira Satou, Taiichi Otsuji, Michael S. Shur

FUNDAMENTAL AND APPLIED PROBLEMS OF TERAHERTZ DEVICES AND TECHNOLOGIES　58　79-85　2017

ISSN： 1793-1274
Current-injection terahertz lasing in a distributed-feedback dual-gate graphene-channel transistor Peer-reviewed

G. Tamamushi, T. Watanabe, J. Mitsushio, A. A. Dubinov, A. Satou, T. Suemitsu, M. Ryzhii, V. Ryzhii, T. Otsuji

QUANTUM SENSING AND NANO ELECTRONICS AND PHOTONICS XIV　10111　2017

DOI： 10.1117/12.2249983 　

ISSN： 0277-786X
直列アレイ化とレンズ集積による非対称二重格子ゲート高電子移動度トランジスタのテラヘルツ波受光効率向上

細谷友崇, 糟谷文月, 谷口弘樹, 渡辺隆之, 末光哲也, 尾辻泰一, 瀧田佑馬, 伊藤弘昌, 南出泰亜, 石橋忠夫, 清水誠, 佐藤昭

IEICE Technical Report　116　(375)　23-28　2016/12/19
Publisher:
ISSN： 0913-5685
Plasmonic enhancement of terahertz devices efficiency International-journal Invited Peer-reviewed

V. Mitin, V. Ryzhii, M. Ryzhii, A. Satou, T. Otsuji, M.S. Shur

RJUSE: 5th Russia-Japan-USA-Europe Symposium on Fundamental & Applied Problems of Terahertz Devices & Technologies Tech. Dig., Sendai, Miyagi, Japan　1　(1)　102-105　2016/11/03
Array configuration and silicon-lens integration of asymmetric dual-grating-gate HEMT for improvement of light coupling efficiency International-journal Peer-reviewed

F. Kasuya, H. Taniguchi, T. Watanabe, T. Suemitsu, T. Otsuji, T. Ishibashi, M. Shimizu, Y. Takida, H. Ito, H. Minamide, A. Satou

RJUSE: 5th Russia-Japan-USA-Europe Symposium on Fundamental & Applied Problems of Terahertz Devices & Technologies　2016/10/31

DOI： 10.1109/IRMMW-THz.2016.7758755 　
InP HEMT and graphene FET for optical to sub-THz carrier frequency conversion International-journal Peer-reviewed

A. Satou, K. Sugawara, G. Tamamushi, T. Watanabe, A. Dobroiu, T. Suemitsu, H. Fukidome, M. Suemitsu, V. Ryzhii, K. Iwatsuki, S. Kuwano, J. Kani, J. Terada, T. Otsuji

RJUSE: 5th Russia-Japan-USA-Europe Symposium on Fundamental & Applied Problems of Terahertz Devices & Technologies　2016/10/31
Models for plasmonic THz detectors based on graphene split-gate FETs with lateral p-n junctions International-journal Peer-reviewed

Maxim Ryzhii, Victor Ryzhii, Akira Satou, Taiichi Otsuji, Vladimir Mitin, Michael S. Shur

International Conference on Simulation of Semiconductor Processes and Devices, SISPAD　361-364　2016/10/20
Publisher: Institute of Electrical and Electronics Engineers Inc.
DOI： 10.1109/SISPAD.2016.7605221 　
A numerical model for finite-temperature self-energy in doped graphene with electron-electron interaction International-journal Peer-reviewed

T. Komatsu, T. Otsuji, V. Ryzhii, D. Svintsov, V. Vyurkov, A. Satou

Graphene Canada: Graphene & 2D Materials International Conference and Exhibition　2016/10/18
Current injection terahertz lasing in graphene-channel field-effect transistors under population inversion International-journal Peer-reviewed

T. Watanabe, G. Tamamushi, A. A. Dubinov, A. Satou, M. Ryzhii, V. Ryzhii, T. Otsuji

ICMNE: Int. Conf. on Micro- and Nano-Electronics　2016/10/03
5.2-THz Single-Mode Lasing in Current-Injection Distributed-Feedback Dual-Gate Graphene-Channel Field-Effect Transistor International-journal Peer-reviewed

Gen Tamamushi, Takayuki Watanabe, Alexander A. Dubinov, Hiroyuki Wako, Akira Satou, Tetsuya Suemitsu, Maxim Ryzhii, Victor Ryzhii, Taiichi Otsuji

2016 41ST INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ)　2016/09/25

DOI： 10.1109/IRMMW-THz.2016.7758354 　

ISSN： 2162-2027
Array Configuration and Silicon-Lens Integration of Asymmetric Dual-Grating-Gate Plasmonic THz Detectors International-journal Peer-reviewed

F. Kasuya, H. Taniguchi, T. Watanabe, T. Suemitsu, T. Otsuji, T. Ishibashi, M. Shimizu, Y. Takida, H. Ito, H. Minamide, A. Satou

2016 41ST INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ)　2016/09/25

DOI： 10.1109/IRMMW-THz.2016.7758755 　

ISSN： 2162-2027
Numerical characterization of dyakonov-shur instability in gated two-dimensional electron systems International-journal Peer-reviewed

Akira Satou, Koichi Narahara

International Journal of High Speed Electronics and Systems　25　(3-4)　1640024-1-1640024-10　2016/09/01
Publisher: World Scientific Publishing Co. Pte Ltd
DOI： 10.1142/S0129156416400243 　

ISSN： 0129-1564
Plasmonic enhancement of terahertz devices efficiency International-journal Peer-reviewed

Vladimir Mitin, Victor Ryzhii, Maxim Ryzhii, Akira Satou, Taiichi Otsuji, Michael S. Shur

International Journal of High Speed Electronics and Systems　25　(3-4)　1640019-1-1640019-7　2016/09/01
Publisher: World Scientific Publishing Co. Pte Ltd
DOI： 10.1142/S012915641640019X 　

ISSN： 0129-1564
Broadband Characteristics of Ultrahigh Responsivity of Asymmetric Dual-Grating-Gate Plasmonic Terahertz Detectors International-journal Peer-reviewed

Fuzuki Kasuya, Tetsuya Kawasaki, Shinya Hatakeyama, Stephane Boubanga Tombet, Tetsuya Suemitsu, Taiichi Otsuji, Guillaume Ducournau, Dominique Coquillat, Wojciech Knap, Yuma Takida, Hiromasa Ito, Hiroaki Minamide, Denis V. Fateev, Vyacheslav V. Popov, Yahya M. Meziani, Akira Satou

2015 40TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER AND TERAHERTZ WAVES (IRMMW-THZ)　2016/08/26

DOI： 10.1109/IRMMW-THz.2015.7327926 　

ISSN： 2162-2027
Nanostructured Asymmetric Dual-Grating-Gate Plasmonic THz Detectors: Enhancement of External Coupling Efficiency by Array Configuration and Silicon-Lens Integration International-journal Peer-reviewed

F. Kasuya, H. Taniguchi, T. Watanabe, T. Suemitsu, T. Otsuji, Y. Takida, H. Ito, H. Minamide, T. Ishibashi, M. Shimizu, A. Satou

2016 IEEE 16TH INTERNATIONAL CONFERENCE ON NANOTECHNOLOGY (IEEE-NANO)　116-118　2016/08/23

DOI： 10.1109/NANO.2016.7751467 　
Terahertz emission and detection in graphene-based heterostructures International-journal Peer-reviewed

S. Boubanga Tombet, D. Yadav, G. Tamamushi, T. Watanabe, A. A. Dubinov, A. Satou, T. Suemitsu, M. Ryzhii, V. Ryzhii, T. Otsuji

Global Graphene Forum 2016　2016/08/23
Graphene-based van der Waals heterostuctrue plasmonic metamaterials for terahertrz device applications International-journal Peer-reviewed

T. Otsuji, D. Svintsov, A. Dubinov, D. Yadav, S. Boubanga Tombet, T. Watanabe, A. Satou, V. Ryzhii, V. Mitin, M.S. Shur

META 2016: 7th International Conference on Metamaterials, Photonic Crystals and Plasmonics　2016/07/25
Resonant plasmonic terahertz detection in graphene split-gate field-effect transistors with lateral p-n junctions International-journal Peer-reviewed

V. Ryzhii, M. Ryzhii, M. S. Shur, V. Mitin, A. Satou, T. Otsuji

JOURNAL OF PHYSICS D-APPLIED PHYSICS　49　(31)　315103-1-315103-14　2016/07/11

DOI： 10.1088/0022-3727/49/31/315103 　

ISSN： 0022-3727

eISSN： 1361-6463
A fitting model for extraction of intrinsic transistor parameters in graphene FETs International-journal Peer-reviewed

J. Mitsushio, G. Tamamushi, K. Sugawara, A. Satou, T. Suemitsu, H. Fukidome, M. Suemitsu, T. Otsuji

AWAD 2016: Asia-Pacific Workshop on Fundamentals and Applications of Advanced Semiconductor Devices　2016/07/04
Sub-THz Photonic Double-Mixing Conversion Using Transistors International-journal Peer-reviewed

A. Satou, K. Sugawara, G. Tamamushi, T. Watanabe, A. Dobroiu, T. Suemitsu, H. Fukidome, M. Suemitsu, V. Ryzhii, K. Iwatsuki, S. Kuwano, J. Kani, J. Terada, T. Otsuji

AWAD 2016: Asia-Pacific Workshop on Fundamentals and Applications of Advanced Semiconductor Devices　2016/07/04
Observation of Spontaneous Terahertz Emission from Optically Pumped Monolayer Intrinsic Graphene International-journal Peer-reviewed

Takayuki Watanabe, Hiroyuki Wako, Akira Satou, Alexander A. Dubinov, Kenji Kawahara, Hiroki Ago, Victor Ryzhii, Taiichi Otsuji

2016 COMPOUND SEMICONDUCTOR WEEK (CSW) INCLUDES 28TH INTERNATIONAL CONFERENCE ON INDIUM PHOSPHIDE & RELATED MATERIALS (IPRM) & 43RD INTERNATIONAL SYMPOSIUM ON COMPOUND SEMICONDUCTORS (ISCS)　12p-P4-35　2016/06/26
Extraction of Intrinsic and Extrinsic Parameters of Graphene Field-Effect Transistor from Its Asymmetric I-V Characteristic International-journal Peer-reviewed

Akira Satou, Gen Tamamushi, Kenta Sugawara, Junki Mitsushio, Victor Ryzhii, Taiichi Otsuji

2016 COMPOUND SEMICONDUCTOR WEEK (CSW) INCLUDES 28TH INTERNATIONAL CONFERENCE ON INDIUM PHOSPHIDE & RELATED MATERIALS (IPRM) & 43RD INTERNATIONAL SYMPOSIUM ON COMPOUND SEMICONDUCTORS (ISCS)　2016/06/26

DOI： 10.1109/ICIPRM.2016.7528701 　
A Fitting Model for Asymmetric I-V Characteristics of Graphene FETs for Extraction of Intrinsic Mobilities International-journal Peer-reviewed

Akira Satou, Gen Tamamushi, Kenta Sugawara, Junki Mitsushio, Victor Ryzhii, Taiichi Otsuji

IEEE TRANSACTIONS ON ELECTRON DEVICES　63　(8)　3300-3306　2016/06/22

DOI： 10.1109/TED.2016.2578325 　

ISSN： 0018-9383

eISSN： 1557-9646
Single-Mode Terahertz Emission from Current-Injection Graphene-Channel Transistor under Population Inversion International-journal Peer-reviewed

Gen Tamamushi, Takayuki Watanabe, Alexander A. Dubinov, Junki Mitsushio, Hiroyuki Wako, Akira Satou, Tetsuya Suemitsu, Hirokazu Fukidome, Maki Suemitsu, Maxim Ryzhii, Victor Ryzhii, Taiichi Otsuji

2016 74TH ANNUAL DEVICE RESEARCH CONFERENCE (DRC)　225-226　2016/06/21

DOI： 10.1109/DRC.2016.7548491 　
Giant plasmon instability in a dual-grating-gate graphene field-effect transistor International-journal Peer-reviewed

Y. Koseki, V. Ryzhii, T. Otsuji, V. V. Popov, A. Satou

PHYSICAL REVIEW B　93　(24)　245408-1-245408-5　2016/06/10

DOI： 10.1103/PhysRevB.93.245408 　

ISSN： 2469-9950

eISSN： 2469-9969
Current-Injection Terahertz Lasing in Distributed-Feedback Dual-Gate Graphene-Channel Field-Effect Transistor International-journal Peer-reviewed

Gen Tamamushi, Takayuki Watanabe, Alexander A. Dubinov, Hiroyuki Wako, Akira Satou, Tetsuya Suemitsu, Maxim Ryzhii, Victor Ryzhii, Taiichi Otsuji

2016 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)　SM3L.7　2016/06/06

DOI： 10.1364/CLEO_SI.2016.SM3L.7 　

ISSN： 2160-9020
Emission and detection of terahertz radiation in graphene-based van der Waals heterostuctrues International-journal Peer-reviewed

T. Otsuji, S. A. Boubanga-Tombet, T. Watanabe, D. Yadav, A. Satou, A. A. Dubinov, D. Svintsov, M. Ryzhii, V. Mitin, M.S. Shur, V. Ryzhii

EMN Meeting on Terahertz　2016/05/14
Plasmonic THz devices based on InP HEMTs and Graphene FETs International-journal Peer-reviewed

A. Satou, T. Watanabe, T. Suemitsu, V. Ryzhii, D. Fateev, V. V. Popov, T. Otsuji

EMN Meeting on Terahertz　2016/05/14
Cooperative promotion of plasma instabilities for emission of terahertz radiation in an asymmetric dual-grating-gate graphene-channel FET International-journal Peer-reviewed

Akira Satou, Yuki Koseki, Takayuki Watanabe, Vyacheslav V. Popov, Victor Ryzhii, Taiichi Otsuji

TERAHERTZ PHYSICS, DEVICES, AND SYSTEMS X: ADVANCED APPLICATIONS IN INDUSTRY AND DEFENSE　9856　2016/04/17

DOI： 10.1117/12.2227438 　

ISSN： 0277-786X
有限温度でのグラフェン内電子間相互作用によるエネルギー分散補正の計算モデル構築

小松竜大, 尾辻泰一, Victor Ryzhii, Dmitry Svintsov, Vladimir Vyurkov, 佐藤昭

第63回応用物理学会春季学術講演会予稿集　2016/03/19
グラフェンFETにおける真性トランジスタパラメータ抽出用モデルの評価

満塩純希, 玉虫元, 菅原健太, 佐藤昭, 末光哲也, 吹留博一, 末光眞希, 尾辻泰一

第63回応用物理学会春季学術講演会予稿集　63rd　2016/03/19
非対称二重格子ゲート・プラズモニックTHz波検出器のアレイ化と超半球シリコンレンズ集積による受光効率向上

谷口弘樹, 糟谷文月, 渡辺隆之, 末光哲也, 尾辻泰一, 瀧田佑馬, 伊藤弘昌, 南出泰亜, 石橋忠夫, 清水誠, 佐藤昭

第63回応用物理学会春季学術講演会予稿集　2016/03/19
THz devices based on plasmons in 2D electron systems International-journal Invited Peer-reviewed

A. Satou, T. Watanabe, T. Suemitsu, V. Ryzhii, D. Fateev, V. V. Popov, T. Otsuji

XX International Symposium “Nanophysics & Nanoelectronics　2016/03/14
Graphene-based van der Waals heterostructures for emission and detection of terahertz radiation Peer-reviewed

Taiichi Otsuji, Alexander Dubinov, VladimirYa Aleshkin, Dmitry Svintsov, Maxim Ryzhii, Stephane Boubanga Tombet, Deepika Yadav, Akira Satou, Vladimir Mitin, Michael S. Shur, Victor Ryzhii

TERAHERTZ PHYSICS, DEVICES, AND SYSTEMS X: ADVANCED APPLICATIONS IN INDUSTRY AND DEFENSE　9856　2016

DOI： 10.1117/12.2225257 　

ISSN： 0277-786X
Models for Plasmonic THz Detectors Based on Graphene Split-Gate FETs with Lateral p-n Junctions Peer-reviewed

Maxim Ryzhii, Victor Ryzhii, Akira Satou, Taiichi Otsuji, Vladimir Mitin, Michael S. Shur

2016 INTERNATIONAL CONFERENCE ON SIMULATION OF SEMICONDUCTOR PROCESSES AND DEVICES (SISPAD)　361-364　2016

ISSN： 1946-1569
グラフェンチャネルFETにおける真性パラメータの抽出

玉虫元, 菅原健太, 佐藤昭, 田島圭一郎, 吹留博一, 末光眞希, 尾辻泰一

IEICE Technical Report　114　(387)　63-68　2015/12/21
非対称性指数向上とアレイ化による非対称二重格子ゲートHEMTの検出感度向上

糟谷文月, 川﨑鉄哉, 渡辺隆之, Stephane Boubanga Tombet, 末光哲也, 尾辻泰一, 瀧田佑馬, 伊藤弘昌, 南出泰亜, 佐藤昭

2015年電子情報通信学会総合大会予稿集　2015/09/09
Terahertz wave generation using graphene and compound semiconductor nano-heterostructures International-journal Invited Peer-reviewed

Taiichi Otsuji, Victor Ryzhii, Stephane Boubanga Tombet, Akira Satou, Maxim Ryzhii, Vyacheslav V. Popov, Wojciech Knap, Vladimir Mitin, Michael Shur

Nanoscale Materials and Devices for Electronics, Photonics and Solar Energy　237-261　2015/08/26
Publisher: Springer International Publishing
DOI： 10.1007/978-3-319-18633-7_7 　
Emission and detection of terahertz radiation using two-dimensional plasmonic metamaterials International-journal Invited Peer-reviewed

T. Otsuji, A. Satou, S.A. Boubanga Tombet, V. Ryzhii, V.V. Popov, V. Mitin, M.S. Shur

The 6th International Conference on Metamaterials, Photonic Crystals and Plasmonics Proceedings　1319-1320　2015/08/04
Plasmonic terahertz emitters and detectors for sensing and wireless communications, International-journal Invited Peer-reviewed

T. Otsuji, A. Satou, S. Boubanga-Tombet, T. Watanabe, G. Ducournau, Y.M. Meziani, W. Knap, V.V. Popov

Proc. PIERS 2015 in Prague　2247-2253　2015/07/06
Computational study of plasmon instabilities in dual-grating-gate graphene transistor International-journal Peer-reviewed

A. Satou, Y. Koseki, V. Ryzhii, V. V. Popov, T. Otsuji

EDISON 19: 19th International Conference on Electron Dynamics in Semiconductors, Optoelectronics, and Nanostructures　2015/06/29
Computational study of graphene plasmons: damping mechanisms and instabilities International-journal Invited Peer-reviewed

A. Satou, Y. Koseki, V. Ryzhii, V. V. Popov, T. Otsuji

RJUS TeraTech-2015: The 4th Russia-Japan-USA Symposium: The Fundamental & Applied Problems of Terahertz Devices & Technologies　102-104　2015/06/09
Terahertz wave generation using graphene and III-V semiconductor heterostructures International-journal Invited Peer-reviewed

T. Otsuji, S. Boubanga-Tombet, A. Satou, T. Watanabe, V. Ryzhii, M. Ryzhii, V. V. Popov, A. A. Dubinov, V. Mitin, M. Shur

RJUS TeraTech-2015: The 4th Russia-Japan-USA Symposium: The Fundamental & Applied Problems of Terahertz Devices & Technologies　2015/06/09
Graphene Active Plasmonics for Terahertz Device Applications International-journal Invited Peer-reviewed

Taiichi Otsuji, Alexander Dubinov, Maxim Ryzhii, Stephane Boubanga Tombet, Akira Satou, Vladimir Mitin, Michael S. Shur, Victor Ryzhii

Prof. SPIE　9476　94760Y-1-94760Y-11　2015/05/22

DOI： 10.1117/12.2185118 　

ISSN： 0277-786X
非対称二重格子ゲート構造を有するグラフェントランジスタにおけるプラズマ不安定性

小関勇気, Victor Ryzhii, 尾辻泰一, Viacheslav V. Popov, 佐藤昭

第62回応用物理学会春季学術講演会予稿集　2015/03/12
非対称二重格子ゲートHEMTによるテラヘルツ波検出の周波数特性

佐藤昭, Stephane Boubanga Tombet, 渡辺隆之, 川﨑鉄哉, 糟谷文月, 末光哲也, Denis V. Fateev, Vyacheslav V. Popov, 南出泰亜, 伊藤弘昌, Dominique Coquillat, Wojciech Knap, Guillaume Ducournau, Yahya M. Meziani, 尾辻泰一

第62回応用物理学会春季学術講演会予稿集　2015/03/12
Terahertz photocurrents generated in two-dimensional electron systems by non-centrosymmetric plasmon modes International-journal Peer-reviewed

V.V. Popov, D.V. Fateev, A. Satou, S.A. Boubanga-Tombet, Y. Kurita, T. Watanabe, T. Otsuji

OTST: Int. Conf. on Optical Teraherz Science and Technology, PS3-1, San Diego, CA, USA, 8-13 March 2015.　PS3　1　2015/03/11
超高速テラヘルツ無線を支える光電子デバイス技術の動向 Invited

佐藤昭, 尾辻泰一

2015年電子情報通信学会総合大会予稿集　2015/03/10
Geometrical dependences of ultrahigh responsivity and its broadband characteristics of InP-based asymmetric dual-grating-gate high-electron-mobility transistors International-journal Peer-reviewed

A. Satou, T. Kawasaki, S. Hatakeyama, S. Boubanga Tombet, T. Suemitsu, G. Ducournau, D. Coquillat, W. Knap, D. V. Fateev, V. V. Popov, Y. M. Meziani, T. Otsuji

OTST 2015: Optical Terahertz Science and Technology 2015　P9　2015/03/08
Room-Temperature, Zero-Bias Plasmonic THz Detection by Asymmetric Dual-Grating-Gate HEMT International-journal Peer-reviewed

T. Watanabe, T. Kawasaki, A. Satou, S. Boubanga Tombet, T. Suemitsu, G. Ducournau, D. Coquillat, W. Knap, H. Minamide, H. Ito, V. V. Popov, Y. M. Meziani, T. Otsuji

TERAHERTZ, RF, MILLIMETER, AND SUBMILLIMETER-WAVE TECHNOLOGY AND APPLICATIONS VIII　9362　255　2015/02/11

DOI： 10.1117/12.2079184 　

ISSN： 0277-786X
Active guiding of Dirac plasmons in graphene International-journal Peer-reviewed

Mikhail Yu. Morozov, Artur R. Davoyan, Ilya M. Moiseenko, Akira Satou, Taiichi Otsuji, Vyacheslav V. Popov

APPLIED PHYSICS LETTERS　106　(6)　061105-1-061105-5　2015/02/01

DOI： 10.1063/1.4907644 　

ISSN： 0003-6951

eISSN： 1077-3118
Effects of carrier-carrier scattering on population inversion in graphene under pulse photoexcitation Peer-reviewed

Akira Satou, Victor Ryzhii, Taiichi Otsuji

INTERNATIONAL SCIENTIFIC SEMINARS ON "FUNDAMENTAL AND APPLIED PROBLEMS OF PHOTONICS AND CONDENSED MATTER PHYSICS"　584　2015

DOI： 10.1088/1742-6596/584/1/012018 　

ISSN： 1742-6588
Recent advances in the research toward graphene-based terahertz lasers International-journal Invited Peer-reviewed

Taiichi Otsuji, Akira Satou, Takayuki Watanabe, Stephane A. Boubanga-Tombet, Maxim Ryzhii, Alexander Dubinov, Vyacheslav V. Popov, Vladimir Mitin, Michael Shur, Victor Ryzhii

Proceedings of SPIE - The International Society for Optical Engineering　9382　(1)　2015
Publisher: SPIE
DOI： 10.1117/12.2079411 　

ISSN： 1996-756X 0277-786X
非対称二重格子ゲート高電子移動度トランジスタを用いたプラズモニックテラヘルツ検出の広帯域特性

佐藤昭, Stephane Boubanga Tombet, 渡辺隆之, 川﨑鉄哉, 末光哲也, Denis V. Fateev, Vyacheslav V. Popov, 南出泰亜, 伊藤弘昌, Dominique Coquillat, Wojciech Knap, Guillaume Ducournau, 尾辻泰一

IEICE Technical Report　114　(387)　63-68　2014/12/22
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

More details Close

We compare the measured broadband characteristics of the responsivity of asymmetric dual-grating-gate high-electron-mobility transistors in the terahertz range and theoretically predicted characteristics. Using the hydrodynamic model, we show that the plasmonic drag and ratchet effects originating from hydrodynamic nonlinearities of plasmons take place due to the asymmetric placement of the grating gates, and we derive the analytical expressions of DC photocurrents generated by these effects. We show that the photocurrent due to the plasmonic drag effect is dominant in the low-frequency range, whereas the photocurrent due to the plasmonic ratchet effect is dominant in the high-frequency range. We demonstrate that the measured broadband characteristic of the responsivity agrees well with the theory.
THz detection using a dual-grating-gate plasmonic detector International-journal Peer-reviewed

S. Boubanga Tombet, A. Satou, V. V. Popov, T. Otsuji

TeraNano V: THz detection using a dual-grating-gate plasmonic detector　Th-11-4　2014/12/01
Graphene active plasmonics for new types of terahertz lasers International-journal Peer-reviewed

Taiichi Otsuji, Akira Satou, Stephane Boubanga Tombet, Alexander A. Dubinov, Vyacheslav V. Popov, Victor Ryzhii, Michael S. Shur

International Journal of High Speed Electronics and Systems　23　1450016-1-17　2014/11/08
Publisher: World Scientific Publishing Co. Pte Ltd
DOI： 10.1142/S0129156414500165 　

ISSN： 0129-1564
Giant Terahertz Gain by Excitation of Surface Plasmon Polaritons in Optically Pumped Graphene International-journal Invited Peer-reviewed

Taiichi Otsuji, Takayuki Watanabe, Stephane Boubanga Tombet, Akira Satou, Alexander A. Dubinov, Vladimir Ya. Aleshkin, Vladimir Mitin, Victor Ryzhii

TERAHERTZ PHYSICS, DEVICES, AND SYSTEMS VIII: ADVANCED APPLICATIONS IN INDUSTRY AND DEFENSE　9102　(1)　A4.05　2014/09/25

DOI： 10.1117/12.2055376 　

ISSN： 0277-786X
Graphene vertical hot-electron terahertz detectors International-journal Peer-reviewed

V. Ryzhii, A. Satou, T. Otsuji, M. Ryzhii, V. Mitin, M. S. Shur

JOURNAL OF APPLIED PHYSICS　116　(11)　114504-1-114504-9　2014/09/17

DOI： 10.1063/1.4895738 　

ISSN： 0021-8979

eISSN： 1089-7550
Detection of Terahertz and Mid-Infrared radiations by InP-Based Asymmetric Dual-Grating-Gate HEMTs International-journal Peer-reviewed

D. Coquillat, P. Zagrajek, N. Dyakonova, K. Chrzanowski, J. Marczewski, Y. Kurita, A. Satou, K. Kobayashi, S. Boubanga Tombet, V. V. Popov, T. Suemitsu, T. Otsuji, W. Knap

2014 39TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ)　2014/09/15

DOI： 10.1109/IRMMW-THz.2014.6956522 　

ISSN： 2162-2027
Carrier-carrier scattering and negative dynamic conductivity in pumped graphene International-journal Peer-reviewed

Dmitry Svintsov, Victor Ryzhii, Akira Satou, Taiichi Otsuji, Vladimir Vyurkov

OPTICS EXPRESS　22　(17)　19873-19886　2014/08/11

DOI： 10.1364/OE.22.019873 　

ISSN： 1094-4087
Effects of carrier-carrier scattering on graphene terahertz/photonic devices International-journal Peer-reviewed

A. Satou, V. Ryzhii, V. Mitin, F. T. Vasko, T. Otsuji

ICPS 2014: 2014 International Symposium on Physics of Semiconductors　2962216　2014/08/10
Damping mechanism of terahertz plasmons in graphene on heavily-doped substrate International-journal Peer-reviewed

Y. Koseki, A. Satou, V. Ryzhii, V. Vyurkov, T. Otsuji

ICPS 2014: 2014 International Symposium on Physics of Semiconductors　2965517　2014/08/10
Current-driven detection of terahertz radiation using a dual-grating-gate plasmonic detector International-journal Peer-reviewed

S. Boubanga-Tombet, Y. Tanimoto, A. Satou, T. Suemitsu, Y. Wang, H. Minamide, H. Ito, D. V. Fateev, V. V. Popov, T. Otsuji

APPLIED PHYSICS LETTERS　104　(26)　262104-1-262104-4　2014/07/01

DOI： 10.1063/1.4886763 　

ISSN： 0003-6951

eISSN： 1077-3118
Ultrahigh sensitive sub-THz plasmonic detector based on asymmetric dual-grating-gate HEMT International-journal Invited Peer-reviewed

A. Satou, Y. Kurita, G. Ducournau, D. Coquillat, K. Kobayashi, S. Boubanga Tombet, Y. M. Meziani, V. V. Popov, W. Knap, T. Suemitsu, T. Otsuji

RJUS TeraTech-2014: The 3rd Russia-Japan-USA Symposium: The Fundamental & Applied Problems of Terahertz Devices & Technologies　21-23　2014/06/18
Damping mechanism of terahertz plasmons in graphene on heavily-doped substrate International-journal Peer-reviewed

Y. Koseki, A. Satou, V. Ryzhii, V. Vyurkov, T. Otsuji

q　48-50　2014/06/18
Damping mechanism of terahertz plasmons in graphene on heavily doped substrate International-journal Peer-reviewed

A. Satou, Y. Koseki, V. Ryzhii, V. Vyurkov, T. Otsuji

JOURNAL OF APPLIED PHYSICS　115　(10)　104501-1-104501-7　2014/03/14

DOI： 10.1063/1.4867971 　

ISSN： 0021-8979

eISSN： 1089-7550
Emission and detection of terahertz radiation using two-dimensional plasmons in semiconductor nanoheterostructures for nondestructive evaluations Peer-reviewed

Taiichi Otsuji, Takayuki Watanabe, Stephane Albon Boubanga Tombet, Akira Satou, Victor Ryzhii, Vyacheslav Popov, Wojciech Knap

OPTICAL ENGINEERING　53　(3)　2014/03

DOI： 10.1117/1.OE.53.3.031206 　

ISSN： 0091-3286

eISSN： 1560-2303
Graphene Active Plasmonics and their Applications to Terahertz Lasers and Sensors International-journal Peer-reviewed

Taiichi Otsuji, Akira Satou, Takayuki Watanabe, Alexander Dubinov, Vyacheslav Popov, Stephane Albon Boubanga Tombet, Vladimir Mitin, Victor Ryzhii

QUANTUM SENSING AND NANOPHOTONIC DEVICES XI　8993　8993-80　2014/02/01

DOI： 10.1117/12.2042328 　

ISSN： 0277-786X
Gain enhancement effect of surface plasmon polaritons on terahertz stimulated emission in optically pumped monolayer graphene

Tetsuya Kawasaki, Takayuki Watanabe, Tetsuya Fukushima, Yuhei Yabe, Stephane Albon Boubanga Tombet, Akira Satou, Alexander A. Dubinov, Vladimir Ya Aleshkin, Vladimir Mitin, Victor Ryzhii, Taiichi Otsuji

Optics InfoBase Conference Papers　2014
Publisher: Optical Society of America (OSA)
DOI： 10.1364/cleo_si.2014.sf2f.4 　

ISSN： 2162-2701
Plasma resonant terahertz photomixers based on double graphene layer structures Peer-reviewed

Maxim Ryzhii, Michael S. Shur, Vladimir Mitin, Akira Satou, Victor Ryzhii, Taiichi Otsuji

2ND RUSSIA-JAPAN-USA SYMPOSIUM ON THE FUNDAMENTAL AND APPLIED PROBLEMS OF TERAHERTZ DEVICES AND TECHNOLOGIES (RJUS TERATECH - 2013)　486　2014

DOI： 10.1088/1742-6596/486/1/012032 　

ISSN： 1742-6588
Graphene Plasmonic Heterostructures for Terahertz Device Applications Peer-reviewed

Taiichi Otsuji, Akira Satou, Stephane Boubanga Tombet, Victor Ryzhii, Vyacheslav V. Popov, Michael S. Shur

2014 INTERNATIONAL CONFERENCE LASER OPTICS　2014
Graphene Plasmonic Heterostructures for New Types of Terahertz Lasers Peer-reviewed

Taiichi Otsuji, Victor Ryzhii, Stephane Albon Boubanga Tombet, Takayuki Watanabe, Akira Satou, Maxim Ryzhii, Alexander Dubinov, Vladimir Ya. Aleshkin, Vyacheslav Popov, Vladimir Mitin, Michael Shur

TERAHERTZ EMITTERS, RECEIVERS, AND APPLICATIONS V　9199　2014

DOI： 10.1117/12.2061510 　

ISSN： 0277-786X
Frequency dispersion and damping mechanisms of terahertz plasmons in graphene transistor structures International-journal Peer-reviewed

Akira Satou, V. Ryzhii, Vladimir V. Mitin, Fedir T. Vasko, Taiichi Otsuji

Journal of Physics: Conference Series　486　(1)　Mo1-5　2014
Publisher: Institute of Physics Publishing
DOI： 10.1088/1742-6596/486/1/012029 　

ISSN： 1742-6596 1742-6588
Graphene surface emitting terahertz laser: Diffusion pumping concept International-journal Peer-reviewed

Arthur R. Davoyan, Mikhail Yu. Morozov, Vyacheslav V. Popov, Akira Satou, Taiichi Otsuji

APPLIED PHYSICS LETTERS　103　(25)　251102　2013/12/17

DOI： 10.1063/1.4850522 　

ISSN： 0003-6951

eISSN： 1077-3118
Transient stimulated emission from multi-split-gated graphene structure International-journal Peer-reviewed

A. Satou, F. T. Vasko, T. Otsuji, V. V. Mitin

JOURNAL OF PHYSICS D-APPLIED PHYSICS　47　(5)　55103　2013/12/01

DOI： 10.1088/0022-3727/47/5/055103 　

ISSN： 0022-3727

eISSN： 1361-6463
Ultrahigh sensitive non-resonant and resonant terahertz detection by asymmetric dual-grating gate HEMTs International-journal Invited Peer-reviewed

Y. Kurita, G. Ducournau, D. Coquillat, K. Kobayashi, A. Satou, Y.M. Meziani, V.V. Popov, W. Knap, T. Suemitsu, T. Otsuji

SSDM: International Conf. on Solid State Devices and Materials　2013/09/26
Terahertz population inversion in optically pumped graphene: dependence on pumping photon energy International-journal Peer-reviewed

A. Satou, Y. Kurita, V. Ryzhii, T. Otsuji

2013 JSAP-MRS Joint Symposia Symposium C: dvanced Nano Carbon Devices and Materials　19p-M8-9　2013/09/19
Damping of terahertz plasmons in graphene by heavily-doped substrate International-journal Peer-reviewed

A. Satou, Y. Koseki, V. Ryzhii, T. Otsuji

RPGR2013: Recent Progress on Graphene Research　12p-P4-31　2013/09/12
Concepts of plasmonic terahertz devices based on double-graphene layer structures International-journal Peer-reviewed

V. Ryzhii, A. Satou, T. Otsuji, M. Ryzhii, V. Mitin, M. S. Shur

RPGR2013: Recent Progress on Graphene Research　10p-A3-O1　2013/09/10
Resonant plasmonic terahertz photomixing in double-graphene layer structures International-journal Peer-reviewed

V. Ryzhii, T. Otsuji, A. Satou, M. Ryzhii, V. Mitin, M.S. Shur

EDISON: The 18th International Conference on Electron Dynamics in Semiconductors, Optoelectronics and Nanostructures　Mo1-4　2013/07/22
Dynamic effects in double graphene-layer structures with inter-layer resonant-tunnelling negative conductivity International-journal Peer-reviewed

V. Ryzhii, A. Satou, T. Otsuji, M. Ryzhii, V. Mitin, M. S. Shur

JOURNAL OF PHYSICS D-APPLIED PHYSICS　46　(31)　315107　2013/07/12

DOI： 10.1088/0022-3727/46/31/315107 　

ISSN： 0022-3727
The gain enhancement effect of surface plasmon polaritons on terahertz stimulated emission in optically pumped monolayer graphene Peer-reviewed

Takayuki Watanabe, Tetsuya Fukushima, Yuhei Yabe, Stephane Albon Boubanga Tombet, Akira Satou, Alexander A. Dubinov, Vladimir Ya Aleshkin, Vladimir Mitin, Victor Ryzhii, Taiichi Otsuji

NEW JOURNAL OF PHYSICS　15　2013/07

DOI： 10.1088/1367-2630/15/7/075003 　

ISSN： 1367-2630
Gain Enhancement Effect of Surface Plasmon Polaritons on Terahertz Stimulated Emission in Optically Pumped Monolayer Graphene International-journal Peer-reviewed

Tetsuya Kawasaki, Takayuki Watanabe, Tetsuya Fukushima, Yuhei Yabe, Stephane Albon Boubanga Tombet, Akira Satou, Alexander A. Dubinov, Vladimir Ya Aleshkin, Vladimir Mitin, Victor Ryzhii, Taiichi Otsuji

2014 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)　1　(1)　SF2F-4　2013/07/01

ISSN： 2160-9020
Challenges to create graphene terahertz lasers International-journal Invited Peer-reviewed

Taiichi Otsuji, Akira Satou, Maxim Ryzhii, Vyachaslav Popov, Vladimir Mitin, Victor Ryzhii

2ND RUSSIA-JAPAN-USA SYMPOSIUM ON THE FUNDAMENTAL AND APPLIED PROBLEMS OF TERAHERTZ DEVICES AND TECHNOLOGIES (RJUS TERATECH - 2013)　486　p. 659　2013/06/27

DOI： 10.1088/1742-6596/486/1/012007 　

ISSN： 1742-6588
Observation of Terahertz Resonant Absorption in Graphene Micro-Ribbon Arrays International-journal Peer-reviewed

Takayuki Watanabe, Tetsuya Fukushima, Paul A. Russel, Akira Satou, Daniel M. Mittleman, Junichiro Kono, Taiichi Otsuji

2013 CONFERENCE ON LASERS AND ELECTRO-OPTICS PACIFIC RIM (CLEO-PR)　WC4-2　2013/06/26
Ultrahigh sensitive sub-terahertz detection by InP-based asymmetric dual-grating-gate high-electron-mobility transistors and their broadband characteristics International-journal Peer-reviewed

Y. Kurita, G. Ducournau, D. Coquillat, A. Satou, K. Kobayashi, S. Boubanga Tombet, Y. M. Meziani, V. V. Popov, W. Knap, T. Suemitsu, T. Otsuji

APPLIED PHYSICS LETTERS　104　(25)　251114-1-255114-4　2013/06/25

DOI： 10.1063/1.4885499 　

ISSN： 0003-6951

eISSN： 1077-3118
Plasmonic Terahertz Monochromatic Coherent Emission from an Asymmetric Chirped Dual-Grating-Gate InP-HEMT with a Photonic Vertical Cavity International-journal Peer-reviewed

Takayuki Watanabe, Yuki Kurita, Akira Satou, Tetsuya Suemitsu, Wojciech Knap, Viacheslav V. Popov, Taiichi Otsuji

2013 71ST ANNUAL DEVICE RESEARCH CONFERENCE (DRC)　129-+　2013/06/24

ISSN： 1548-3770
Frequency dispersion and damping mechanisms of terahertz plasmons in graphene transistor structure International-journal Peer-reviewed

A. Satou, V. Ryzhii, E.T. Vasko, V.V. Mitin, T. Otsuji

CLEO: Conference on Lasers and Electrooptics Dig　JTh2A.33　2013/06/13
Double injection in graphene p-i-n structures International-journal Peer-reviewed

V. Ryzhii, I. Semenikhin, M. Ryzhii, D. Svintsov, V. Vyurkov, A. Satou, T. Otsuji

JOURNAL OF APPLIED PHYSICS　113　(24)　244505　2013/06/01

DOI： 10.1063/1.4812494 　

ISSN： 0021-8979

eISSN： 1089-7550
Plasmonic Terahertz Monochromatic Coherent Emission from an Asymmetric Chirped Dual-Grating-Gate InP-HEMT with Highly Asymmetric Resonant Cavities International-journal Peer-reviewed

T. Watanabe, A. Satou, T. Suemitsu, W. Knap, V.V. Popov, T. Otsuji

ISCS: Int. Symp. on Coumpound Semiconductors　TuC4-5　2013/05/21
Terahertz photomixing using plasma resonances in double-graphene layer structures International-journal Peer-reviewed

V. Ryzhii, M. Ryzhii, V. Mitin, M. S. Shur, A. Satou, T. Otsuji

JOURNAL OF APPLIED PHYSICS　113　(17)　174506　2013/05/13

DOI： 10.1063/1.4804063 　

ISSN： 0021-8979

eISSN： 1089-7550
Emission and Detection of Terahertz Radiation Using Two Dimensional Plasmons in Semiconductor Nano-Heterostructures for Nondestructive Evaluations International-journal Invited Peer-reviewed

Taiichi Otsuji, Takayuki Watanabe, Stephane Albon Boubanga Tombet, Akira Satou, Victor Ryzhii, Vyacheslav Popov, Wojciech Knap

MICRO- AND NANOTECHNOLOGY SENSORS, SYSTEMS, AND APPLICATIONS V　8725　8725-13　2013/05/03

DOI： 10.1117/12.2015089 　

ISSN： 0277-786X
Graphene Active Plasmonic Metamaterials for New Types of Terahertz Lasers International-journal Invited Peer-reviewed

Taiichi Otsuji, Takayuki Watanabe, Akira Satou, Vyacheslav Popov, Victor Ryzhii

TERAHERTZ PHYSICS, DEVICES, AND SYSTEMS VII: ADVANCED APPLICATIONS IN INDUSTRY AND DEFENSE　8716　8716-24　2013/04/29

DOI： 10.1117/12.2019717 　

ISSN： 0277-786X
Threshold of terahertz population inversion and negative dynamic conductivity in graphene under pulse photoexcitation International-journal Peer-reviewed

A. Satou, V. Ryzhii, Y. Kurita, T. Otsuji

JOURNAL OF APPLIED PHYSICS　113　(14)　143108　2013/04/13

DOI： 10.1063/1.4801916 　

ISSN： 0021-8979

eISSN： 1089-7550
Plasmonic terahertz monochromatic coherent emission from an asymmetric chirped dual-grating-gate InAlAs/InGaAs/InP HEMT with highly asymmetric resonant cavities International-journal Peer-reviewed

T. Watanabe, A. Satou, T. Suemitsu, W. Knap, V. Popov, T. Otsuji

OTST: International Conference on Optical Terahertz Science and Technology　Th3-26　2013/04/04
Terahertz population inversion and negative dynamic conductivity in optically pumped graphene: dependence on pumping photon energy International-journal Peer-reviewed

Akira Satou, Yuuki Kurita, Taiichi Otsuji, Victor Ryzhii

OTST: International Conference on Optical Terahertz Science and Technology　W3B-6　2013/04/02
Terahertz-Wave Generation Using Graphene -toward the Creation of Graphene Injection Lasers International-journal Invited Peer-reviewed

T. Otsuji, A. Satou, S. A. Boubanga Tombet, M. Ryzhii, V. Ryzhii

INTERNATIONAL CONFERENCE MICRO- AND NANO-ELECTRONICS 2012　8700　L2-02　2013/04/01

DOI： 10.1117/12.2017063 　

ISSN： 0277-786X
Instability-driven plasmonic terahertz monochromatic coherent emission from an asymmetric dual-grading gate HEMT with a resonant-enhanced cavity structure

T. Watanabe, T. Fukushima, Y. Kurita, A. Satou, T. Suemitsu, T. Otsuji

60th JSAP Spring Meeting, Kanagawa, Mar. 27-30　28p-D1-9　2013/03/27
Terahertz monochromatic coherent emission from an asymmetric chirped dual-grating-gate InP-HEMT with a photonic vertical cavity Peer-reviewed

Takayuki Watanabe, Yuki Kurita, Akira Satou, Tetsuya Suemitsu, Wojciech Knap, Viacheslav V. Popov, Taiichi Otsuji

International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz　2013

DOI： 10.1109/IRMMW-THz.2013.6665894 　

ISSN： 2162-2027 2162-2035
Plasmonic Terahertz Monochromatic Coherent Emission from an Asymmetric Chirped Dual-Grating-Gate InP-HEMT with a Photonic Vertical Cavity Peer-reviewed

Takayuki Watanabe, Akira Satou, Tetsuya Suemitsu, Wojciech Knap, Viacheslav V. Popov, Taiichi Otsuji

2013 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)　2013

ISSN： 2160-9020
Terahertz light amplification by stimulated emission of radiation in optically pumped graphene International-journal Invited Peer-reviewed

Taiichi Otsuji, Stephane Boubanga Tombet, Akira Satou, S. Chan, Victor Ryzhii

Materials Research Society Symposium Proceedings　1451　169-177　2013

DOI： 10.1557/opl.2012.1108 　

ISSN： 0272-9172
Terahertz-wave generation using graphene: Toward new types of terahertz lasers International-journal Invited Peer-reviewed

Taiichi Otsuji, Stephane Boubanga Tombet, Akira Satou, Maxim Ryzhii, Victor Ryzhii

IEEE Journal on Selected Topics in Quantum Electronics　19　(1)　2013

DOI： 10.1109/JSTQE.2012.2208734 　

ISSN： 1077-260X
Graphene terahertz lasers: Injection versus optical pumping International-journal Invited Peer-reviewed

Taiichi Otsuji, Akira Satou, Maxim Ryzhii, Vladimir Mitin, Victor Ryzhii

Materials Research Society Symposium Proceedings　1505　168-179　2013
Publisher: Materials Research Society
DOI： 10.1557/opl.2013.523 　

ISSN： 0272-9172
Terahertz-wave generation using graphene: Toward new types of terahertz lasers International-journal Invited Peer-reviewed

Taiichi Otsuji, Stephane Boubanga Tombet, Akira Satou, Maxim Ryzhii, Victor Ryzhii

IEEE Journal on Selected Topics in Quantum Electronics　19　(1)　8400209　2013

DOI： 10.1109/JSTQE.2012.2208734 　

ISSN： 1077-260X
Emission and detection of terahertz radiation using two-dimensional electrons in III-V semiconductors and graphene International-journal Peer-reviewed

Taiichi Otsuji, Takayuki Watanabe, Stephane A. Boubanga Tombet, Akira Satou, Wojciech M. Knap, Vyacheslav V. Popov, Maxim Ryzhii, Victor Ryzhii

IEEE Transactions on Terahertz Science and Technology　3　(1)　63-71　2013

DOI： 10.1109/TTHZ.2012.2235911 　

ISSN： 2156-342X
Numerical simulation of terahertz plasmons in gated graphene structures International-journal Peer-reviewed

A. Satou, V. Ryzhii, F. T. Vasko, V. V. Mitin, T. Otsuji

Proceedings of SPIE - The International Society for Optical Engineering　8624　862412　2013

DOI： 10.1117/12.2003611 　

ISSN： 0277-786X
Numerical simulation of terahertz plasmons in gated graphene structures International-journal Peer-reviewed

A. Satou, V. Ryzhii, F. T. Vasko, V. V. Mitin, T. Otsuji

Proceedings of SPIE - The International Society for Optical Engineering　8624　862412　2013

DOI： 10.1117/12.2003611 　

ISSN： 0277-786X
Graphene terahertz lasers: Injection versus optical pumping International-journal Invited Peer-reviewed

Taiichi Otsuji, Akira Satou, Maxim Ryzhii, Vladimir Mitin, Victor Ryzhii

Materials Research Society Symposium Proceedings　1505　168-179　2013
Publisher: Materials Research Society
DOI： 10.1557/opl.2013.523 　

ISSN： 0272-9172
Numerical simulation of terahertz plasmons in gated graphene structures International-journal Peer-reviewed

A. Satou, V. Ryzhii, F. T. Vasko, V. V. Mitin, T. Otsuji

Proceedings of SPIE - The International Society for Optical Engineering　8624　P17　2013

DOI： 10.1117/12.2003611 　

ISSN： 0277-786X
Graphene active plasmonics for superradiant terahertz lasing International-journal Peer-reviewed

T. Otsuji, T. Watanabe, S.A. Boubanga Tombet, A. Satou, A. A. Dubinov, V. Popov, V. Ryzhii

International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz　2013

DOI： 10.1109/IRMMW-THz.2013.6665848 　

ISSN： 2162-2027 2162-2035
Dependency of negative dynamic conductivity on momentum relaxation time in optically pumped graphene International-journal Peer-reviewed

Y. Kurita, A. Satou, T. Watanabe, T. Fukushima, S. Boubanga Tombet, S. Chan, V. Ryzhii, T. Otsuji

FTT: Frontiers in Terahertz Technology　P1.15　2012/12/28
Measurement of the field distribution of THz photon echo pulses in an electro-optic crystal International-journal Peer-reviewed

Y. Yabe, T. Fukushima, T. Watanabe, A. Satou, T. Otsuji

TeraNano III: 3rd Int'l Symp. on Terahertz Nanoscience　P.22　2012/12/12
THz population inversion in graphene under pulse excitation: dependence on pumping photon energy International-journal Peer-reviewed

Y. Kurita, A. Satou, T. Watanabe, T. Fukushima, V. Ryzhii, T. Otsuji

TeraNano III: 3rd Int'l Symp. on Terahertz Nanoscience　P.12　2012/12/12
Study on THz negative dynamic conductivity in optically pumped graphene International-journal Peer-reviewed

K. Kojima, M. Ryzhii, V. Mitin, A. Satou, V. Ryzhii, T. Otsuji

TeraNano III: 3rd Int'l Symp. on Terahertz Nanoscience　P.9　2012/12/12
Numerical study of plasmons in gated graphene structures International-journal Peer-reviewed

A. Satou, T. Otsuji, F.T. Vasko, V.V. Mitin, V. Ryzhii

TeraNano III: 3rd Int'l Symp. on Terahertz Nanoscience　2012/12/11
Graphene materials and devices in terahertz science and technology International-journal Invited Peer-reviewed

Taiichi Otsuji, Stephane Albon Boubanga Tombet, Akira Satou, Hirokazu Fukidome, Maki Suemitsu, Eiichi Sano, Vyacheslav Popov, Maxim Ryzhii, Victor Ryzhii

MRS BULLETIN　37　(12)　1235-1243　2012/12/01

DOI： 10.1557/mrs.2012.241 　

ISSN： 0883-7694
Terahertz-wave generation using graphene towards new types of terahertz lasers International-journal Invited Peer-reviewed

T. Otsuji, A. Satou, M. Ryzhii, V. Ryzhii

ISGD: International Symposium on Graphene Devices　IT-08　2012/11/06

DOI： 10.1109/JPROC.2013.2260113 　
Instability-driven terahertz emission and injection locking behavior in an asymmetric dual-grating-gate HEMT with a vertical cavity structure International-journal Peer-reviewed

T. Watanabe, T. Fukushima, Y. Kurita, A. Satou, T. Otsuji

ICMNE: Int. Conf. on Micro and Nanoelectronics　P1-43　2012/10/03
Theoretical study of terahertz plasma instability in asymmetric double-grating gate transistor structures International-journal Peer-reviewed

A. Satou, H. Shida, T. Otsuji, V.V. Popov

ICMNE: Int. Conf. on Micro and Nanoelectronics　O1-05　2012/10/03
Study on optimum design of T-gates in InGaAs HEMTs by electrostatic field analysis

T. Yoshida, A. Satou, T. Otsuji, T. Suemitsu

73rd JSAP Fall Meeting, Matsuyama, Japan, Sep. 11-14　11a-PA5-4　2012/09/11
Graphene-based devices in terahertz science and technology International-journal Invited Peer-reviewed

T. Otsuji, S. A. Boubanga Tombet, A. Satou, H. Fukidome, M. Suemitsu, E. Sano, V. Popov, M. Ryzhii, V. Ryzhii

JOURNAL OF PHYSICS D-APPLIED PHYSICS　45　(30)　303001　2012/07/13

DOI： 10.1088/0022-3727/45/30/303001 　

ISSN： 0022-3727
Toward the creation of terahertz graphene lasers: injection vs. optical pumping International-journal Invited Peer-reviewed

T. Otsuji, A. Satou, M. Ryzhii, V. Ryzhii

TeraNano 2012: 2nd Int. Symp on Terahertz Nanoscience　2012/07/05
Instability-driven terahertz emission and injection locking behavior in an asymmetric dual-grating gate HEMT with a vertical cavity structure International-journal Peer-reviewed

T. Watanabe, T. Fukushima, Y. Kurita, A. Satou, T. Otsuji

TeraNano 2012: 2nd Int. Symp on Terahertz Nanoscience　2012/07/04
Relationship between momentum relaxation time and negative dynamic conductivity in optically pumped graphene International-journal Peer-reviewed

Y. Kurita, T. Watanabe, T. Fukushima, S. B. Tombet, A. Satou, V. Ryzhii, T. Otsuji, S. Chan

TeraNano 2012: 2nd Int. Symp on Terahertz Nanoscience　2012/07/04
Simulation of terahertz plasmons in graphene and heterostructure two-dimensional electron gas International-journal Peer-reviewed

A. Satou, H. Shida, T. Otsuji, V. Ryzhii

TeraNano 2012: 2nd Int. Symp on Terahertz Nanoscience　2012/07/04
Spectroscopic Study on Ultrafast Carrier Dynamics and Terahertz Amplified Stimulated Emission in Optically Pumped Graphene International-journal Peer-reviewed

Taiichi Otsuji, Stephane Boubanga-Tombet, Akira Satou, Maki Suemitsu, Victor Ryzhii

JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES　33　(8)　825-838　2012/06/03

DOI： 10.1007/s10762-012-9908-8 　

ISSN： 1866-6892

eISSN： 1866-6906
Ultrahigh sensitive plasmonic terahertz detectors based on an asymmetric dual-grating gate HEMT structure International-journal Invited Peer-reviewed

Taiichi Otsuji, Stephane Boubanga-Tombet, Takayuki Watanabe, Yudai Tanimoto, Akira Satou, Tetsuya Suemitsu, Yuye Wang, Hiroaki Minamide, Hiromasa Ito, Yahya Moubarak Meziani, Dominique Coquillat, Wojciech Knap, Denis Fateev, Viacheslav Popov

Proc. SPIE　8363　(83630)　1-8　2012/05/09

DOI： 10.1117/12.919978 　

ISSN： 0277-786X
Population inversion and terahertz lasing in graphene Invited Peer-reviewed

V. V. Mitin, V. Ryzhii, M. Ryzhii, A. Satou, T. Otsuji

Proc. of SPIE (SPIE Defense Security and Sensing, Conference 8373: Micro- and Nanotechnology Sensors, Systems, and Applications IV, Paper 8373-81, April 23-27, 2012.)　8373　(1)　837328-1-14　2012/04/27

DOI： 10.1117/12.918662 　
Emission and detection of terahertz dadiation using two-dimensional electrons in III-V semiconductors and graphene International-journal Invited Peer-reviewed

T. Otsuji, T. Watanabe, S.A. Boubanga Tombet, A. Satou, W. Knap, V.V. Popov, M. Ryzhii, V. Ryzhii

ISST: the 23rd International Symposium on Space Terahertz Technology Proc., Tokyo, April 2-4, 2012.　1　(1)　I-4-1-4　2012/04/03
Terahertz Negative Dynamic Conductivity in Optically Pumped Graphene International-journal Invited Peer-reviewed

A. Satou, T. Otsuji, V. Ryzhii, F. T. Vasko

PROCEEDINGS OF PROGRESS IN ELECTROMAGNETICS RESEARCH SYMPOSIUM (PIERS 2012)　1　(1)　486-490　2012/03/27

ISSN： 1559-9450
Ultrafast carrier dynamics and terahertz emission in optically pumped graphene at room temperature International-journal Peer-reviewed

S. Boubanga-Tombet, S. Chan, T. Watanabe, A. Satou, V. Ryzhii, T. Otsuji

PHYSICAL REVIEW B　85　(3)　035443-1-035443-6　2012/01/26

DOI： 10.1103/PhysRevB.85.035443 　

ISSN： 1098-0121

eISSN： 1550-235X
Terahertz-wave generation using graphene International-journal Invited Peer-reviewed

Taiichi Otsuji, Stephane Boubanga Tombet, Akira Satou, Maxim Ryzhii, Victor Ryzhii

Materials Research Society Symposium Proceedings　1437　(1)　36-47　2012

DOI： 10.1557/opl.2012.1186 　

ISSN： 0272-9172
Terahertz wave generation using graphene-Toward the creation of terahertz graphene injection lasers International-journal Peer-reviewed

T. Otsuji, S. Boubanga Tombet, A. Satou, V. Ryzhii, M. Ryzhii

2012 Lester Eastman Conference on High Performance Devices, LEC 2012　1　(1)　GRA2-2　2012

DOI： 10.1109/lec.2012.6410968 　
Graphene-based electro-optical modulator: Concept and analysis International-journal Peer-reviewed

V. Ryzhii, A. Satou, T. Otsuji, S. O. Yurchenko, M. Ryzhii, N. Ryabova, M. S. Shur

IMFEDK 2012 - 2012 International Meeting for Future of Electron Devices, Kansai　44-45　2012

DOI： 10.1109/IMFEDK.2012.6218573 　
Terahertz Injection-Locked Oscillation in Plasmon-Resonant Transistors International-journal Peer-reviewed

Y. Tanimoto, T. Watanabe, A. Satou, T. Otsuji

International TeraNano &GDRI Workshop Extended Abstract　1　(1)　28P-15　2011/11/28
Observation of Terahertz 2D-Plasmon Modes in a Graphene Ribbon Array International-journal Peer-reviewed

T. Watanabe, T. Fukushima, S. Boubanga Tombet, A. Satou, T. Otsuji, S. Chan, V. Ryzhii, V. Popov

International TeraNano &GDRI Workshop Extended Abstract　1　(1)　28P-04　2011/11/28
Observation of Stimulated Emission from Optically Pumped Graphene by UsingTerahertz Photon Echoes International-journal Peer-reviewed

T. Fukushima, T. Watanabe, S. B. Tombet, A. Satou, T. Otsuji

International TeraNano &GDRI Workshop Extended Abstract　1　(1)　28P-03-23　2011/11/28
Publisher: Organizing Committee of Tohoku-Section Joint Convention of Institutes of Electrical and Information Engineers, Japan
DOI： 10.11528/tsjc.2011.0_23 　
Population Inversion in Optically Pumped Graphene: Effect of Carrier-Carrier Scattering," International TeraNano &GDRI Workshop Extended Abstract International-journal Peer-reviewed

A. Satou, T. Otsuji, V. Ryzhii, F. T. Vasko

International TeraNano &GDRI Workshop Extended Abstract　1　(1)　24P-18　2011/11/24
Threshold of terahertz wave amplificaion from optically pumped graphene International-journal Invited Peer-reviewed

A. Satou, S. A. Boubanga Tombet, T. Otsuji, V. Ryzhii

ACSIN 2011: 11th International Conference on Atomically Controlled Surfaces, Interfaces and Nanostructures, carb18, St. Petersburg, Russia, Oct. 4, 2011.　1　(1)　Carb18　2011/10/04

DOI： 10.1088/0953-8984/23/14/145302 　
Stimulated Terahertz Emission from Optically Pumped Graphene International-journal Peer-reviewed

S. Boubanga Tombet, A. Satou, T. Otsuji, V. Ryzhii

2011 36TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ)　1　(1)　W4B.3　2011/10/03

DOI： 10.1109/irmmw-THz.2011.6105193 　

ISSN： 2162-2027
Concepts of Terahertz and Infrared Devices Based on Graphene Structures International-journal Invited Peer-reviewed

V. Ryzhii, M. Ryzhii, A. A. Dubinov, V. Ya. Aleshkin, V. Mitin, M. S. Shur, A. Satou, S. Boubanga Tombet, T. Otsuji

2011 36TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ)　1　(1)　Tu3C.1　2011/10/03

DOI： 10.1109/irmmw-THz.2011.6105062 　

ISSN： 2162-2027
Effect of Heating and Cooling of Photogenerated Electron-Hole Plasma in Optically Pumped Graphene on Population Inversion International-journal Peer-reviewed

Victor Ryzhii, Maxim Ryzhii, Vladimir Mitin, Akira Satou, Taiichi Otsuji

JAPANESE JOURNAL OF APPLIED PHYSICS　50　(9)　094001-1-094001-9　2011/09/20

DOI： 10.1143/JJAP.50.094001 　

ISSN： 0021-4922

eISSN： 1347-4065
Modeling of short-gate and drain-induced barrier lowering effects in graphene bilayer field-effect transistors: weak nonlocality approximation International-journal Peer-reviewed

M.Ryzhii, V.Mitin, A.Satou, T.Otsuji, V.Ryzhii

SISPAD: 2011 International Conference on Simulation of Semiconductor Processes and Devices Digest　1　(1)　P22　2011/09/09
Nonequilibrium carriers and phonons in optically excited graphene: heating and cooling International-journal Peer-reviewed

V. Ryzhii, M. Ryzhii, A. Satou, T. Otsuji, V. Mitin

EDISON17: 17th International Conference on Electron Dynamics in Semiconductors, Optoelectronics and Nanostructures　1　(1)　P2.8　2011/08/11
Optical Excitation of Graphene, Population Inversion, and Terahertz Lasing International-journal Invited Peer-reviewed

V. Ryzhii, M. Ryzhii, A. Satou, T. Otsuji, V. Mitin

15TH INTERNATIONAL CONFERENCE ON NARROW GAP SYSTEMS (NGS15)　1416　26-30　2011/08/01

DOI： 10.1063/1.3671689 　

ISSN： 0094-243X
The effect of carrier-carrier scattering on population inversion in optically pumped graphene International-journal Peer-reviewed

A. Satou, T. Otsuji, V. Ryzhii, F.T. Vasko

EP2DS-19: the 19th international conference on Electronic Properties of Two-Dimensional Electron Systems　2011/07/27
Theoretical Study of Population Inversion in Graphene under Pulse Excitation International-journal Peer-reviewed

Akira Satou, Taiichi Otsuji, Victor Ryzhii

JAPANESE JOURNAL OF APPLIED PHYSICS　50　(7)　070116-1-070116-4　2011/07/20

DOI： 10.1143/JJAP.50.070116 　

ISSN： 0021-4922

eISSN： 1347-4065
Threshold Behavior of Stimulated Terahertz Emission from Optically Pumped Graphene International-journal Peer-reviewed

A. Satou, S. Boubanga-Tombet, V. Ryzhii, T. Otsuji

12th Int. Conf. Science & Application of Nanotubes, Sattelite Symp. on Graphene Technology: Production, Assembly and Applications Abstract　1　(1)　173　2011/07/16

DOI： 10.1088/0953-8984/23/14/145302 　
Amplified Stimulated Terahertz Emission from Optically Pumped Graphene International-journal Peer-reviewed

Taiichi Otsuji, Stephane Boubanga Tombet, Akira Satou, Victor Ryzhii

2011 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)　2011/05/01

ISSN： 2160-9020
Terahertz light amplification by stimulated emission of radiation from optically pumped graphene International-journal Invited Peer-reviewed

Taiichi Otsuji, Stephane A. Boubanga Tombet, Silvia Chan, Akira Satou, Victor Ryzhii

TERAHERTZ PHYSICS, DEVICES, AND SYSTEMS V: ADVANCE APPLICATIONS IN INDUSTRY AND DEFENSE　8023　802304-1-802304-7　2011/04/24

DOI： 10.1117/12.887946 　

ISSN： 0277-786X
二次元プラズモンおよびグラフェンによるテラヘルツ波発生 Invited

尾辻泰一, 佐藤昭, 末光哲也, Maxim Ryzhii, Victor Ryzhii

春季第58回応用物理学関係連合講演会予稿集　1　(1)　26p-BX - 3　2011/03/26
反射型電気光学サンプリングによるテラヘルツフォトンエコーの観測

福嶋哲也, 谷本雄大, 渡辺隆之, Stephene Boubanga Tombe, 佐藤昭, 尾辻泰一

春季第58回応用物理学関係連合講演会予稿集　1　(1)　25p-KF - 1　2011/03/25
Analytical device model for graphene bilayer field-effect transistors using weak nonlocality approximation International-journal Peer-reviewed

V. Ryzhii, M. Ryzhii, A. Satou, T. Otsuji, V. Mitin

JOURNAL OF APPLIED PHYSICS　109　(6)　2011/03/21

DOI： 10.1063/1.3560921 　

ISSN： 0021-8979
Amplified Stimulated Terahertz Emission from Optically Pumped Graphene International-journal Invited Peer-reviewed

T. Otsuji, S. A. Boubanga Tombet, S. Chan, T. Watanabe, A. Satou, V. Ryzhii

PIERS 2011 MARRAKESH: PROGRESS IN ELECTROMAGNETICS RESEARCH SYMPOSIUM　7　(4)　517-519　2011/03/20

ISSN： 1559-9450
Study of threshold behavior of stimulated terahertz emission from optically pumped graphene International-journal Peer-reviewed

A. Satou, S. A. Boubanga Tombet, T. Otsuji, V. Ryzhii

OTST: Int. Conf. on Optical Terahertz Science and Technology Dig.　1　(1)　TuA3　2011/03/15

DOI： 10.1088/0953-8984/23/14/145302 　
Study of Threshold Behavior of Stimulated Terahertz Emission International-journal Peer-reviewed

A. Satou, S. Albon Boubanga Tombet, T. Otsuji

OTST2011: the International Workshop on Optical Terahertz Science and Technology　2011/03/13
Study of Threshold Behavior of Stimulated Terahertz Emission from Optically Pumped Graphene International-journal Peer-reviewed

A. Satou, S. Albon Boubanga Tombet, T. Otsuji, V. Ryzhii

OTST2011: the International Workshop on Optical Terahertz Science and Technology　1　(1)　2011/03/13
Concepts of graphene-based terahertz and infrared devices International-journal Peer-reviewed

V.Ryzhii, M.Ryzhii, N.Ryabova, A.A.Dubinov, V.Ya.Aleshkin, V.Mitin, A.Satou, T.Otsuji

FNST: in Nanoscale Science and Technology Workshop　1　(1)　P-14　2011/01/05
Terahertz light amplification of stimulated emission of radiation in optically pumped graphene International-journal Invited Peer-reviewed

T. Otsuji, S. A. Boubanga Tombet, S. Chan, T. Watanabe, A. Satou, M. Ryzhii, V. Ryzhii

2011 30th URSI General Assembly and Scientific Symposium, URSIGASS 2011　1　(1)　DAF1.7　2011

DOI： 10.1109/URSIGASS.2011.6050613 　
Stimulated terahertz emission from optically pumped graphene International-journal Peer-reviewed

S. Boubanga Tombet, A. Satou, T. Otsuji, V. Ryzhii

IRMMW-THz 2011 - 36th International Conference on Infrared, Millimeter, and Terahertz Waves　2011

DOI： 10.1109/irmmw-THz.2011.6105193 　
光励起グラフェンの非平衡キャリア緩和過程とテラヘルツ帯における反転分布

佐藤昭, ヴィクトールリズィー, ステファンボウバンガ-トムベット, 尾辻泰一

IEICE Technical Report　110　(342)　31-34　2010/12/24
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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We study theoretically the population inversion in terahertz (THz) frequency in intrinsic graphene under optical pulse excitation. We develop the theoretical model of carrier relaxation dynamics based on the quasi-classical Boltzmann equation taking into account the quasi-equilibration by the carrier-carrier (CC) scattering and the energy relaxation and recombination by the intra and interband optical phonon (OP) scattering. Using the model developed, we demonstrate that the population inversion can be achieved under the pulse excitation, due to the imbalance between the energy relaxation by the intraband OP emission and the recombination by the interband OP emission.
Coherent and Tunable Terahertz Emission from Nano-metric Field Effect Transistor at Room Temperature

S. Boubanga-Tombet, A. Satou, V. Ryzhii, T. Otsuji

IEICE Technical Report　110　(342)　35-39　2010/12/24
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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We report on reflective electro-optic sampling measurements of TeraHertz emission from nanometer-gate-length InGaAs-based high electron mobility transistors. The room temperature coherent gate-voltage tunable emission is demonstrated. We establish that the physical mechanism of the coherent TeraHertz emission is related to the plasma waves driven by simultaneous current and optical excitation. A significant shift of the plasma frequency and the narrowing of the emission with increasing channel's current are observed and explained as due to the increase of the carriers' density and drift velocity.
Theoretical study of population inversion in graphene under pulse excitation International-journal Peer-reviewed

A. Satou, T. Otsuji, V. Ryzhii

ISGD: Int. Symp. Graphene Devices Tech. Dig.　1　(1)　T4-14　2010/10/28
Terahertz stimulated emission from optically pumped graphene International-journal Peer-reviewed

S. Boubanga-Tombet, S. Chan, A. Satou, T. Watanabe, T. Otsuji

ISGD: Int. Symp. Graphene Devices Tech. Dig.　1　(1)　T3-05　2010/10/28
Amplified stimulated terahertz emission at room temperature from optically pumped graphene International-journal Peer-reviewed

S. Boubanga Tombet, S. Chan, A. Satou, T. Watanabe, V. Ryzhii, T. Otsuji

EOS Annual Meeting Digest　1　(1)　TOM2_4011_10　2010/10/27
Logic inverting operations using Epitaxial Graphene-on-Silicon Field Effect Transistors International-journal

Amine El Moutaouakil, Hyun-Chul Kang, Hiroyuki Handa, Susumu Takabayashi, Akira Satou, Hirokazu Fukidome, Tetsuya Suemitsu, Eiichi Sano, Maki Suemitsu, Taiichi Otsuji

Proceedings of the 3rd Student Organizing International Mini-Conference on Information Electronics Systems　2010/10/19
Emission of Terahertz Radiation from Two-Dimensional Electron Systems in Semiconductor Nano- and Hetero-Structures International-journal Peer-reviewed

Taiichi Otsuji, Takayuki Watanabe, Amine El Moutaouakil, Hiromi Karasawa, Tsuneyoshi Komori, Akira Satou, Tetsuya Suemitsu, Maki Suemitsu, Eiichi Sano, Wojciech Knap, Victor Ryzhii

JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES　32　(5)　629-645　2010/09/25

DOI： 10.1007/s10762-010-9714-0 　

ISSN： 1866-6892

eISSN： 1866-6906
Observation of Amplified Stimulated Terahertz Emission from Optically Pumped Heteroepitaxial Graphene-on-Silicon Materials International-journal Invited Peer-reviewed

Hiromi Karasawa, Tsuneyoshi Komori, Takayuki Watanabe, Akira Satou, Hirokazu Fukidome, Maki Suemitsu, Victor Ryzhii, Taiichi Otsuji

JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES　32　(5)　655-665　2010/09/25

DOI： 10.1007/s10762-010-9677-1 　

ISSN： 1866-6892

eISSN： 1866-6906
Study of hot carriers in optically pumped graphene International-journal Peer-reviewed

A. Satou, T. Otsuji, V. Ryzhii

SSDM: International Conference on Solide State Devices and Materials Digest　1　(1)　882-883　2010/09/22
グラフェンによるTHz波源 Invited

佐藤昭, 尾辻泰一, リズィーヴィクトール

信学会ソサエティ大会予稿集　1　(1)　CI-2-5　2010/09/14
Graphene-Based Terahertz Devices: Concepts and Characteristics Peer-reviewed

V. Ryzhii, M. Ryzhii, A. Satou, N. Ryabova, T. Otsuji, V. Mitin, F. T. Vasko, A. A. Dubinov, V. Y. Aleshkin, M. S. Shur

Future Trends in Microelectronics: From Nanophotonics to Sensors and Energy　293-306　2010/08/18
Publisher: John Wiley and Sons
DOI： 10.1002/9780470649343.ch25 　
Observation of Amplified Stimulated Terahertz Emission in Optically Pumped Epitaxial Graphene Heterostructures International-journal Peer-reviewed

Hiromi Karasawa, Takayuki Watanabe, Taiichi Otsuji, Maxim Ryzhii, Akira Satou, Victor Ryzhii

2010 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) AND QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE (QELS)　1　(1)　CMP3　2010/05/17
Stimulated Terahertz Emission from Optically Pumped Epitaxial Graphene-on-Si Heterostructures International-journal Invited

T. Otsuji, H. Karasawa, T. Komori, T. Watanabe, M. Suemitsu, A. Satou, V. Ryzhii

PIERS 2010 XI'AN: PROGRESS IN ELECTROMAGNETICS RESEARCH SYMPOSIUM PROCEEDINGS, VOLS 1 AND 2　1　(1)　756-+　2010/03/23

ISSN： 1559-9450
Terahertz lasing in optically pumped epitaxial multiple graphene structures: Concept and feasibility of realization International-journal Peer-reviewed

A. Satou, M. Ryzhii, N. Ryabova, V. Ryzhii, T. Otsuji, A. Dubinov, V. Ya. Aleshkin

TeraTech''09: International Workshop on Terahertz Technology　1　(1)　1P21　2009/11/30
Feasibility of terahertz lasing in optically pumped epitaxial multiple graphene layer structures International-journal Peer-reviewed

V. Ryzhii, M. Ryzhii, A. Satou, T. Otsuji, A. A. Dubinov, V. Ya. Aleshkin

JOURNAL OF APPLIED PHYSICS　106　(8)　084507-1-6　2009/10/22

DOI： 10.1063/1.3247541 　

ISSN： 0021-8979

eISSN： 1089-7550
Self-Excitation of Terahertz Plasma Oscillations in Optically Pumped Graphene International-journal Peer-reviewed

V. Ryzhii, M. Ryzhii, A. Satou, A. El Moutaouakil, T. Otsuji

Int. Conf. on Solid State Devices and Materials (SSDM), Sendai, Japan　1232-1233　2009/10/07
Self-excitation of terahertz plasma oscillations in optically pumped graphene-based heterostructures International-journal Peer-reviewed

V. Ryzhii, M. Ryzhii, A. Satou, El. -M. Amine, T. Otsuji

8th Topical Workshop on Heterostructure Microelectronics (TWHM) Abstracts　1　(1)　Fr-B6-1-2　2009/08/28
Damping of plasma waves in two-dimensional electron systems due to contacts International-journal Peer-reviewed

Akira Satou, Victor Ryzhii, Vladimir Mitin, Nizami Vagidov

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS　246　(9)　2146-2149　2009/08/24

DOI： 10.1002/pssb.200945269 　

ISSN： 0370-1972
Terahertz/far-infrared lasing by utilization of population inversion in graphene under optical pumping International-journal Peer-reviewed

A. Satou, V. Ryzhii, E.T. Vasko, T. Otsuji, V.Yu. Aleshkin, A.A. Dubinov

The 18th International Conference on Electronic Properties of Two-Dimensional Systems (EP2DS-18) Abstract　1　(1)　123-123　2009/07/19
Numerical Simulation of Plasma Waves in High-Electron-Mobility Transistors Using Kinetic Transport Model International-journal Peer-reviewed

Akira Satou, Victor Ryzhii, Nizami Vagidov, Vladimir Mitin

IWCE-13: 2009 13TH INTERNATIONAL WORKSHOP ON COMPUTATIONAL ELECTRONICS　1　(1)　208-+　2009/05/27

DOI： 10.1109/IWCE.2009.5091133 　
Device model for graphene bilayer field-effect transistor International-journal Peer-reviewed

V. Ryzhii, M. Ryzhii, A. Satou, T. Otsuji, N. Kirova

JOURNAL OF APPLIED PHYSICS　105　(10)　104510-1-9　2009/05/09

DOI： 10.1063/1.3131686 　

ISSN： 0021-8979
Graphene under optical pumping: nonequlibrium distributions, population inversion, and terahertz lasing International-journal Peer-reviewed

A. Satou, M. Ryzhii, F. T. Vasko, T. Otsuji, V. Ryzhii

PHYSICS AND SIMULATION OF OPTOELECTRONIC DEVICES XVII　7211　721119　2009/01/24

DOI： 10.1117/12.807794 　

ISSN： 0277-786X
Population inversion and negative dynamic conductivity in optically pumped graphene Peer-reviewed

A. Satou, F. T. Vasko, T. Otsuji, V. Ryzhii

2009 INTERNATIONAL CONFERENCE ON SIMULATION OF SEMICONDUCTOR PROCESSES AND DEVICES　261-+　2009

ISSN： 1946-1569
High-frequency properties of a graphene nanoribbon field-effect transistor International-journal Peer-reviewed

M. Ryzhii, A. Satou, V. Ryzhii, T. Otsuji

JOURNAL OF APPLIED PHYSICS　104　(11)　114505-1-114505-6　2008/12/04

DOI： 10.1063/1.3029715 　

ISSN： 0021-8979
Graphene nanoribbon field-effect transistor: device model and characteristics International-journal Peer-reviewed

V. Ryzhii, M. Ryzhii, A. Satou, T. Otsuji

NMDC 2008: The IEEE Nanotechnology Materials and Devices Conference　1　(1)　62-62　2008/10/20
Nonequilibrium carriers in intrinsic graphene under interband photoexcitation International-journal Peer-reviewed

A. Satou, F. T. Vasko, V. Ryzhii

PHYSICAL REVIEW B　78　(11)　115431-1-115431-6　2008/09/25

DOI： 10.1103/PhysRevB.78.115431 　

ISSN： 1098-0121

eISSN： 1550-235X
Dynamic characteristics of graphene nanoribbon field-effect transistors International-journal Invited Peer-reviewed

M. Ryzhii, A. Satou, T. Otsuji, V. Ryzhii

Ext. Abst. of the 2008 Int. Conf. on Solid State Device and Materials　2008/09/24

DOI： 10.1109/ISCAS.2008.4541381 　
Effect of Contacts on Terahertz Plasma Resonances in Two-Dimensional Electron Systems International-journal Peer-reviewed

Akira Satou, Victor Ryzhii, Nizami Vagidov, Vladimir Mitin, Taiichi Otsuji

SISPAD: 2008 INTERNATIONAL CONFERENCE ON SIMULATION OF SEMICONDUCTOR PROCESSES AND DEVICES　1　(1)　197-+　2008/09/09

DOI： 10.1109/SISPAD.2008.4648271 　
Mechanism of self-excitation of terahertz plasma oscillations in periodically double-gated electron channels International-journal Peer-reviewed

V. Ryzhii, A. Satou, M. Ryzhii, T. Otsuji, M. S. Shur

JOURNAL OF PHYSICS-CONDENSED MATTER　20　(38)　384207-1-384207-6　2008/08/21

DOI： 10.1088/0953-8984/20/38/384207 　

ISSN： 0953-8984
Analysis of resonant detection of terahertz radiation in high-electron mobility transistor with a nanostring/carbon nanotube as the mechanically floating gate International-journal Peer-reviewed

V. G. Leiman, M. Ryzhii, A. Satou, N. Ryabova, V. Ryzhii, T. Otsuji, M. S. Shur

JOURNAL OF APPLIED PHYSICS　104　(2)　024514-1-024514-7　2008/07/28

DOI： 10.1063/1.2957589 　

ISSN： 0021-8979

eISSN： 1089-7550
Current-voltage characteristics of a graphene-nanoribbon field-effect transistor International-journal Peer-reviewed

V. Ryzhii, M. Ryzhii, A. Satou, T. Otsuji

JOURNAL OF APPLIED PHYSICS　103　(9)　094510-1-094510-9　2008/05/08

DOI： 10.1063/1.2917284 　

ISSN： 0021-8979
Broadband terahertz emission from dual-grating gate HEMT's -mechanism and emission spectral profile International-journal Peer-reviewed

T. Nishimura, H. Handa, H. Tsuda, T. Suemitsu, Y. M. Meziani, W. Knap, T. Otsuji, E. Sano, V. Ryzhii, A. Satou, V. V. Popov, D. Coquillat, F. Teppe

Device Research Conference - Conference Digest, DRC　263-264　2008

DOI： 10.1109/DRC.2008.4800831 　

ISSN： 1548-3770
Plasma mechanisms of resonant terahertz detection in a two-dimensional electron channel with split gates International-journal Peer-reviewed

V. Ryzhii, A. Satou, T. Otsuji, M. S. Shur

JOURNAL OF APPLIED PHYSICS　103　(1)　014504-1-014504-6　2008/01/01

DOI： 10.1063/1.2828173 　

ISSN： 0021-8979
Plasma effect and new concept of terahertz devices based on graphene heterostructures International-journal Peer-reviewed

V. Ryzhii, M. Ryzhii, A. Satou, T. Otsuji

Proc. Advanced Workshop on Forntiers in Electronics (WOFE)　15-19　2007/12/16

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Cozumel, Mexico
Plasma waves in graphene-based heterostructures and their terahertz device applications International-journal Invited Peer-reviewed

Victor Ryzhii, Akira Satou, Maxim Ryzhii, Fedir Vasko, Taiichi Otsuji

2007 INTERNATIONAL SEMICONDUCTOR DEVICE RESEARCH SYMPOSIUM, VOLS 1 AND 2　1　(1)　547-547　2007/12/14

DOI： 10.1109/ISDRS.2007.4422510 　
Plasma waves in two-dimensional electron systems and their applications International-journal Peer-reviewed

Victor Ryzhii, Irina Khmyrova, Maxim Ryzhii, Akira Satou, Taiichi Otsuji, Vladimir Mitin, Michael S. Shur

International Journal of High Speed Electronics and Systems　17　(3)　521-538　2007/09

DOI： 10.1142/S0129156407004710 　

ISSN： 0129-1564
Resonant terahertz detection antenna utilizing plasma oscillations in lateral schottky diode International-journal Peer-reviewed

Akira Satou, Victor Ryzhii, Taiichi Otsuji, Michael S. Shur

International Journal of High Speed Electronics and Systems　17　(3)　539-546　2007/09

DOI： 10.1142/S0129156407004722 　

ISSN： 0129-1564
Modeling of resonant terahertz detector with two-dimensional electron gas and lateral Schottky junction International-journal Peer-reviewed

N. Vagidov, A. Satou, V. Ryzhii, V. Mitin

APS March Meeting　1　(1)　U39.00008　2007/03/05
Excitation of two-dimensional plasmon polaritons by an incident electromagnetic wave at a contact International-journal Peer-reviewed

A. Satou, S. A. Mikhailov

PHYSICAL REVIEW B　75　(4)　045328-1-045328-6　2007/01/17

DOI： 10.1103/PhysRevB.75.045328 　

ISSN： 1098-0121
Plasma waves in two-dimensional electron-hole system in gated graphene heterostructures International-journal Peer-reviewed

V. Ryzhii, A. Satou, T. Otsuji

JOURNAL OF APPLIED PHYSICS　101　(2)　024509-1-024509-5　2007/01/01

DOI： 10.1063/1.2426904 　

ISSN： 0021-8979
Plasma-wave effects in transistors and their terahertz applications

V. Ryzhii, A. Satou

IEICE Technical Report　105　(629)　29-37　2006/12/24
Resonant terahertz detectors utilizing plasma oscillations in heterostructures with two-dimensional gated/ungated electron channel and Schottky drain/source contact

A. Satou, N. Vagidov, V. Ryzhii

IEICE Technical Report　106　(403)　77-82　2006/12/24
Terahertz plasma waves in two-dimensional electron systems and their applications International-journal Peer-reviewed

V. Ryzhii, I. Kymyrova, M. Ryzhii, A. Satou, T. Otsuji, V. Mitin, M. S. Shur

Tera- and Nano-Devices: Physics and Modeling　50-51　2006/10/01

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通研インポート200703
Resonant terahertz detection antenna utilizing plasma oscillations in lateral Schottky diode International-journal Peer-reviewed

A. Satou, V. Ryzhii, T. Otsuji, M. S. Shur

IWTND 2006: International Workshop ""Tera- and Nano-Devices: Physics and Modeling""　1　(1)　2006/10/01
Resonant detectors of terahertz radiation based on two-dimensional electron systems with lateral Schottky junction International-journal Peer-reviewed

V. Ryzhii, A. Satou, T. Otsuji, M. S. Shur

IRMMW-THz2006: Joint 31st International Conference on Infrared and Millimeter Waves and 14th International Conference on Terahertz Electronics　1　(1)　532-532　2006/09/18
Resonant terahertz detection based on high-electron-mobility transistor with Schottky source/drain contact International-journal Peer-reviewed

A. Satou, V. Ryzhii, T. Otsuji, M. S. Shur

SSDM 2006: 2006 International Conference on Solid State Devices and Materials　1　(1)　30-31　2006/09/12
Spectra of standing and traveling plasma waves in two-dimensional electron channels International-journal Peer-reviewed

Akira Satou, Alexander Chaplik, Victor Ryzhii, Michael S. Shur

PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES　34　(1月2日)　417-420　2006/08/01

DOI： 10.1016/j.physe.2006.03.101 　

ISSN： 1386-9477
Plasma instability and terahertz generation in HEMTs due to electron transit-time effect International-journal Peer-reviewed

Victor Ryzhii, Akira Satou, Michael S. Shur

IEICE TRANSACTIONS ON ELECTRONICS　E89C　(7)　1012-1019　2006/07/01

DOI： 10.1093/ietele/e89-c.7.1012 　

ISSN： 0916-8524

eISSN： 1745-1353
Resonant terahertz detectors with lateral Schottky junctions International-journal Peer-reviewed

A. Satou, V. Ryzhii, T. Otsuji, M. S. Shur

AWAD2006: 2006 Asia-Pacific Workshop on Fundamental and Application of Advanced Semiconductor Devices　1　(1)　285-289　2006/07/01
Plasma effects in lateral Schottky junction terahertz detector: Models and characteristics International-journal Peer-reviewed

V. Ryzhii, A. Satou, M. S. Shur

IWCE-11: International workshop on computational electronics　1　(1)　333-334　2006/05/25
Plasma oscillations in high-electron-mobility transistors with recessed gate International-journal Peer-reviewed

Ryzhii\\, V, A Satou, W Knap, MS Shur

JOURNAL OF APPLIED PHYSICS　99　(8)　084507-1-084507-5　2006/05/04

DOI： 10.1063/1.2191628 　

ISSN： 0021-8979
Plasma effects in lateral Schottky junction tunneling transit-time terahertz oscillator International-journal Peer-reviewed

V. Ryzhii, A. Satou, I. Khmyrova, M. Ryzhii, T. Otsuji, V. Mitin, M. S. Shur

Seventh International Conference on New Phenomena in Mesoscopic Structures and Fifth International Conference on Surfaces and Interfaces of Mesoscopic Devices, 2005　38　228-233　2006/04/01

DOI： 10.1088/1742-6596/38/1/055 　

ISSN： 1742-6588
Plasma oscillations in two-dimensional electron channel with nonideally conducting side contacts International-journal Peer-reviewed

A Satou, Ryzhii\\, V, A Chaplik

JOURNAL OF APPLIED PHYSICS　98　(3)　034502-1-034502-5　2005/08/05

DOI： 10.1063/1.1993756 　

ISSN： 0021-8979
Transit-time mechanism of plasma instability in high electron mobility transistors Peer-reviewed

Victor Ryzhii, Akira Satou, Michael S. Shur

Physica Status Solidi (A) Applications and Materials Science　202　(10)　R113-R115　2005/08

DOI： 10.1002/pssa.200521018 　

ISSN： 1862-6300 1862-6319
Transit-time mechanism of plasma instability in high electron mobility transistors International-journal Peer-reviewed

Ryzhii\\, V, A Satou, MS Shur

PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE　202　(10)　R113-R115　2005/07/12

DOI： 10.1002/pssa.200521018 　

ISSN： 0031-8965
Spectrum of plasma oscillations in slot diode with two-dimensional electron channel International-journal Peer-reviewed

A Satou, Khmyrova\\, I, A Chaplik, Ryzhii\\, V, M Shur

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS　44　(4B)　2592-2595　2005/04/21

DOI： 10.1143/JJAP.44.2592 　

ISSN： 0021-4922
Plasma oscillations in a slot diode structure with a two-dimensional electron channel International-journal Peer-reviewed

Ryzhii\\, V, A Satou, Khmyrova\\, I, A Chaplik, MS Shur

JOURNAL OF APPLIED PHYSICS　96　(12)　7625-7628　2004/12/02

DOI： 10.1063/1.1803931 　

ISSN： 0021-8979
Plasma oscillations in terahertz photomixing high-electron-mobility transistor structure on p(+)-substrate International-journal Peer-reviewed

A Satou, Vyurkov\\, V, Khmyrova\\, I

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS　43　(4B)　L566-L568　2004/04/02

DOI： 10.1143/JJAP.43.L566 　

ISSN： 0021-4922
Characteristics of a terahertz photomixer based on a high-electron mobility transistor structure with optical input through the ungated regions International-journal Peer-reviewed

A Satou, Ryzhii\\, V, Khmyrova\\, I, M Ryzhii, MS Shur

JOURNAL OF APPLIED PHYSICS　95　(4)　2084-2089　2004/01/30

DOI： 10.1063/1.1641953 　

ISSN： 0021-8979
Electric-field breakdown of absolute negative conductivity and supersonic streams in two-dimensional electron systems with zero resistance/conductance states International-journal Peer-reviewed

Ryzhii\\, V, A Satou

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　72　(11)　2718-2721　2003/11/15

DOI： 10.1143/JPSJ.72.2718 　

ISSN： 0031-9015
Plasma and transit-time mechanisms of the terahertz radiation detection in high-electron-mobility transistors International-journal Peer-reviewed

A. Satou, J. Khmyrova, V. Ryzhii, M. S. Shur

Semiconductor Science and Technology　18　(6)　460-469　2003/06

DOI： 10.1088/0268-1242/18/6/312 　

ISSN： 0268-1242
Admittance of a slot diode with a two-dimensional electron channel International-journal Peer-reviewed

Ryzhii, V, A Satou, MS Shur

JOURNAL OF APPLIED PHYSICS　93　(12)　10041-10045　2003/05/30

DOI： 10.1063/1.1577405 　

ISSN： 0021-8979

eISSN： 1089-7550
Device model for three-terminal lateral p-n junction quantum well lasers International-journal Peer-reviewed

Ryzhii, V, A Satou, Khmyrova, I, T Ikegami, PO Vaccaro, K Kubota, JMZ Ocampo, T Aida

PHYSICS AND SIMULATION OF OPTOELECTRONIC DEVICES XI　4986　132-141　2003/04/01

DOI： 10.1117/12.473056 　

ISSN： 0277-786X
Analytical and computer models of terahertz HEMT-photomixer International-journal Peer-reviewed

Ryzhii, V, A Satou, Khmyrova, I, M Ryzhii, T Otsuji, M Shur

MICROWAVE AND TERAHERTZ PHOTONICS　5466　210-217　2003/04/01

DOI： 10.1117/12.548948 　

ISSN： 0277-786X
Modeling of the excitation of terahertz plasma oscillations in a HEMT by ultrashort optical pulses Peer-reviewed

M. Ryzhii, A. Satou, I. Khmyrova, V. Vyurkov, V. Ryzhii, M. S. Shur

Proceedings of the IEEE/LEOS 3rd International Conference on Numerical Simulation of Semiconductor Optoelectronic Devices, NUSOD 2003　2003-　84-85　2003
Publisher: Institute of Electrical and Electronics Engineers Inc.
DOI： 10.1109/NUSOD.2003.1259058 　
Plasma mechanism of terahertz photomixing in high-electron mobility transistor under interband photoexcitation International-journal Peer-reviewed

Ryzhii, V, Khmyrova, I, A Satou, PO Vaccaro, T Aida, M Shur

JOURNAL OF APPLIED PHYSICS　92　(10)　5756-5760　2002/10/31

DOI： 10.1063/1.1510596 　

ISSN： 0021-8979
Performance analysis of lateral p-n junction laser-transistor International-journal Peer-reviewed

Ryzhii, V, A Satou, Khmyrova, I, T Ikegami, K Kubota, PO Vaccaro, JMZ Ocampo, T Aida

JOURNAL OF APPLIED PHYSICS　92　(8)　4459-4464　2002/07/24

DOI： 10.1063/1.1507813 　

ISSN： 0021-8979
Excitation of plasma oscillations and terahertz photomixing in high-electron mobility transistor Peer-reviewed

V. Ryzhii, A. Satou, I. Khmyrova, P. O. Vaccaro, T. Aida, M. Shur

2002 International Topical Meeting on Microwave Photonics, MWP 2002 - Technical Digest　321-324　2002
Publisher: Institute of Electrical and Electronics Engineers Inc.
DOI： 10.1109/MWP.2002.1158928

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Misc. 24

In-situ observation of graphene crystallinity in the device process by the backside-Raman spectroscopy

関宏信, 田村紘一, TANG Chao, 吹留博一, 佐藤昭, 尾辻泰一

応用物理学会春季学術講演会講演予稿集(CD-ROM)　70th　2023

ISSN： 2436-7613
Development of a high sensitivity biochemical sensor using SERS effect

HENG Y., 斉藤紫音, 平井龍太朗, 熊谷龍馬, 葛西重信, 吹留博一, 佐藤昭, 尾辻泰一, 内野俊

応用物理学会春季学術講演会講演予稿集(CD-ROM)　70th　2023

ISSN： 2436-7613
Photothermoelectric fast THz detection by unipolar operation of Graphene FETs

田村紘一, TANG Chao, 荻浦大地, 諏訪健斗, 吹留博一, 佐藤昭, 瀧田佑馬, 南出泰亜, 末光哲也, 尾辻泰一

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　83rd　2022

ISSN： 2758-4704
Hetero growth of graphene deposited to h-BN/SiC surfaces

小濱路生, 米窪和輝, 杉野秀明, 渡邊一世, 菅原大樹, TANG Chao, 佐藤昭, 尾辻泰一, 吹留博一

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　83rd　2022

ISSN： 2758-4704
Surface-enhanced Raman scattering on Ag/mica substrates with a nanohole structure

HENG Y., 斉藤紫音, 平井龍太朗, 吹留博一, 佐藤昭, 尾辻泰一, 内野俊

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　83rd　2022

ISSN： 2758-4704
Recent Progress in Carrier Down-Conversion Devices Between Optical Communication and Beyond 5G Wireless Communication

佐藤昭, 佐藤昭, 中嶋大, 中嶋大, 西村和樹, 西村和樹, 細谷友崇, 細谷友崇, 細谷友崇, 岩月勝美, 末光哲也, 末光哲也, 葛西恵介, 葛西恵介, 吉田真人, 吉田真人, 尾辻泰一, 尾辻泰一

電子情報通信学会技術研究報告(Web)　121　(309(ED2021 48-61))　2021

ISSN： 2432-6380
非対称二重格子ゲートを有するグラフェントランジスタにおけるプラズモン不安定性とそのテラヘルツ光源応用

荻浦大地, 佐藤昭, 吹留博一, 尾辻泰一

応用物理学会東北支部学術講演会(CD-ROM)　75th　2020
Process development and crystal quality evaluation of graphene/h-BN van der Waals stacked nanocapacitors by transfer/-stack method

菅原大樹, 諏訪健斗, 吹留博一, DELGADO-NOTARIO Juan Antonio, DELGADO-NOTARIO Juan Antonio, 佐藤昭, 尾辻泰一

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　81st　2020
単層グラフェンによる表面増強ラマン分光法(SERS)の高性能化

志賀佳菜子, 今井健介, 草野光希, 吹留博一, 佐藤昭, 尾辻泰一, 内野俊

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　80th　2019
Observation of Broadband THz Emission from Near-IR Laser-Pumped Multilayer Graphene

込山貴大, 渡辺隆之, MOROZOV Sergey, FADEEV Mikhail, UTOCHKIN Vladimir, 吹留博一, 佐藤昭, 尾辻泰一

電子情報通信学会技術研究報告　119　(353(ED2019 76-92))　2019

ISSN： 0913-5685
Electrical Characteristics of Gate Tunable Lateral Graphene Tunnel Diodes

SHIGA K., SUGAWARA K., FUKIDOME H., SATOU A., OTSUJI T., UCHINO T.

電気関係学会東北支部連合大会講演論文集(CD-ROM)　2018　2018
Sub-Terahertz/Terahertz Devices Based on Two-Dimensional Plasmons in Transistor Structures

40　(24)　25-32　2016/08
Publisher: 映像情報メディア学会
ISSN： 1342-6893
Sub-Terahertz/Terahertz Devices Based on Two-Dimensional Plasmons in Transistor Structures

116　(173)　25-32　2016/08/01
Publisher: 電子情報通信学会
ISSN： 0913-5685
Extraction of intrinsic parameter in graphene-channel FET

玉虫元, 菅原健太, 佐藤昭, 田島圭一郎, 吹留博一, 末光眞希, 尾辻泰一

電子情報通信学会技術研究報告　115　(387(ED2015 91-111))　2015

ISSN： 0913-5685
Terahertz Wave Generation Using Plasmonic Metamaterials

24　(1)　48-56　2014/08
Publisher: 日本赤外線学会
ISSN： 0916-7900
グラフェン中プラズモンのＴＨｚ波デバイスへの応用

Akira Satou, Otsuji Taiichi

Journal of the Imaging Society of Japan　53　(1)　53-60　2014
Publisher: The Imaging Society of Japan
DOI： 10.11370/isj.53.53 　

ISSN： 1344-4425
Ultrahigh Sensitive and Frequency-Tunable Terahertz Detection by Asymmetric Dual-Grating-Gate HEMTs

Kawasaki Tetsuya, Hatakeyama Shinya, Kurita Yuki, Ducournau Guillaume, Coquillat Dominique, Kobayashi Kengo, Satou Akira, Meziani Yahya M., Popov Vyacheslav. V., Knap Wojciech, Suemitsu Tetsuya, Otsuji Taiichi

IEICE technical report. Electron devices　113　(357)　97-100　2013/12/16
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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We report on ultrahigh sensitive and frequency-tunable terahertz (THz) detectors by our original asymmetric dual-grating gate high electron mobility transistors (A-DGG HEMTs) based on hydrodynamic nonlinearities of two-dimensional (2D) plasmons. We obtained the record-breaking responsivities exceeding 20 kV/W at 200 GHz and 292 GHz at room temperature by contributing nonlinear rectification response and excellent coupling efficiency provided by the structure. In addition, we successfully observed the resonant-type behavior at a cryogenic temperature. This indicates the potentiality of frequency-tunable ultrahigh-sensitive THz detection.
ED2013-106 Novel concepts and technology for terahertz device application using graphene

RYZHII Victor, SATOU Akira, RYZHII Maxim, OTSUJI Taiichi

IEICE technical report. Electron devices　113　(357)　91-96　2013/12/16
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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Recent progress in study on terahertz device applications using graphene will be reviewed. The device concepts exploiting the unique features of optoelectronic properties of graphene are introduced with theoretical manifestations of their advantageous performances and functionalities. Some technological importances with proof-of-concept experiments as well as future trends are also addressed.
Numerical study of terahertz two-dimensional plasmons in graphene

SATOU Akira, RYZHII Victor, MITIN Vladimir, VASKO Fedir, OTSUJI Taiichi

113　(26)　15-20　2013/05/10
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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We develop a numerical model for simulation of plasmons in graphene with grating-gate structures, based on the Boltzmann equation and self-consistent Poisson equation. Using the model, we study the effect of coupling between plasmons in gated and ungated regions on the frequency tenability by the gate voltage and the damping of plasmons by carrier scattering.
CI-1-3 Graphene terahertz lasers and photonic device applications

Otsuji Taiichi, Satou Akira, Ryzhii Maxim, Sano Eiichi, Suemitsu Maki, Ryzhii Victor

Proceedings of the IEICE General Conference　2013　(1)　"SS-5"-"SS-6"　2013/03/05
Publisher: The Institute of Electronics, Information and Communication Engineers
Terahertz Population Inversion in Graphene by Optical Pulse Excitation

SATOU Akira, RYZHII Victor, KURITA Yuki, OTSUJI Taiichi

IEICE technical report. Electron devices　112　(364)　29-33　2012/12/17
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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We theoretically studied the nonequilibrium carrier relaxation dynamics and the terahertz population inversion in intrinsic graphene excited by optical pulse. Using the model which takes into account the quasi-equilibration by carrier-carrier scattering, energy relaxation and recombination by optical-phonon emission, and the Pauli blocking of optical pulse absorption, we analyzed the dependence of the achievement of the population inversion on the photon energy of the pulse. It was shown that the threshold pulse fluence required for the population inversion is reduced as the photon energy of the pulse becomes lower, due to the dependence of the photoabsorption by graphene on the photon energy and to the reduction of the carrier heating effect by the photoexcited carriers.
Plasma Instablity in Two-Dinmensional Electron Gas in Double-Grating-Gate HEMT

SATOU Akira, SHIDA Hiromi, POPOV Viacheslav V., OTSUJI Taiichi

IEICE technical report. EMD　112　(181)　1-4　2012/08/16
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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We develop a theoretical model for the eigen-modes of plasma waves in two-dimensional electron gas in double-grating-gate HEMT structures, and we report on a novel plasma instability by DC current injection.
CI-2-5 THz source using graphene

Satou Akira, Otusji Taiichi, Ryzhii Victor

Proceedings of the Society Conference of IEICE　2010　(2)　"SS-23"-"SS-24"　2010/08/31
Publisher: The Institute of Electronics, Information and Communication Engineers
Resonant terahertz detectors with lateral Schottky junctions (AWAD2006)

SATOU Akira, RYZHII Victor, OTSUJI Taiichi, SHUR Michael S.

IEICE technical report　106　(138)　285-290　2006/07/03
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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We propose a detector of terahertz (THz) radiation based on a high-electron mobility transistor (HEMT) with a lateral Schottky junction (LSJ) as the drain contact. The HEMT channel serves as a resonant cavity for the plasma oscillations induces by incoming THz radiation. Using the developed device model, we demonstrate that at the frequencies of THz radiation coinciding with the plasma resonant frequencies, the amplitude of the ac potential drop across the LSJ and, therefore, the rectified component of the current used for the detection can be resonantly large. This can result in the responsivity of the LSJ-HEMT detector under consideration significantly exceeding the responsivity of the standard Schottky detectors. The characteristics of LSJ-HEMT detectors are compared with those of LSJ-diode detectors with ungated channels.

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Books and Other Publications 2

グラフェンの最先端技術と拡がる応用 ―グラフェンの材料科学、成長・合成技術、各種デバイス応用―

佐藤昭

フロンティア出版　2012/07/25
グラフェンが拓く材料の新領域―物性・作製法から実用化まで―

佐藤昭

エヌ・ティー・エス　2012/06

Presentations 211

Conversion Gain Enhancement of a UTC-PD-Integrated HEMT Photonic Double-Mixer by High-Intensity Optical Subcarrier Signal International-presentation

Dai Nakajima, Kazuki Nishimura, Mitsuki Watanabe, Tsung-Tse Lin, Keisuke Kasai, Masato Yoshida, Tetsuya Suemitsu, Taiichi Otsuji, Akira Satou

OFC: Optical Fiber Communication Conference 2023　2023/03/06
光サブキャリア信号高強度化によるUTC-PD集積HEMT光ダブルミキサ変換利得の向上

渡邊光貴, 中嶋大, 林宗澤, 西村和樹, 尾辻泰一, 末光哲也, 葛西恵介, 吉田真人, 佐藤昭

電子情報通信学会エレクトロニクスソサエティ電子デバイス研究会(ED)・マイクロ波テラヘルツ光電子技術研究会(MWPTHz)共催電子デバイス研究会　2022/12/19
Drastic Improvement on Pulse Response of Grating-Gate Plasmonic THz Detector by Introduction of Inverted-HEMT Structure International-presentation

K. Narita, D. Nakajima, T. Suemitsu, Y. Takida, H. Minamide, T. Otsuji, A. Satou

FTT: the 3rd International Symposium on Frontiers in THz Technology　2022/11/18
Unipolar photothermoelectric THz detection assisted by Coulomb drift/diffusion of Dirac fermions in asymmetric dual-grating-gate graphene FETs International-presentation

K. Tamura, C. Tang, D. Ogiura, K. Suwa, H. Fukidome, Y. Takida, H. Minamide, T. Suemitsu, T. Otsuji, A. Satou

RPGR: Recent Progress on Graphene and related 2D materials Research International Conference　2022/11/16
Optical-to-MMW/THz Carrier Frequency Down-Conversion by UTC-PD-Integrated HEMT: the Scaling Rule of Conversion Gain on UTC-PD Mesa Size International-presentation

D. Nakajima, K. Nishimura, T. Hosotani, K. Kasai, M. Yoshida, T. Suemitsu, T. Otsuji, A. Satou

SSDM: International Conference on Solid State Devices and Materials　2022/09/28
逆HEMT構造導入による非対称二重格子ゲートHEMTテラヘルツ検出素子のパルス応答におけるテール波形の解消

成田健一, 根来拓海, 瀧田佑馬, 伊藤弘昌, 南出泰亜, 尾辻泰一, 佐藤昭

第83回応用物理学会秋季学術講演会　2022/09/21
UTC-PD-Integrated HEMT For Optical-to-MMW/THz Carrier Frequency Down-Conversion: Scaling Rule Of Conversion Gain On UTC-PD Mesa Size International-presentation

D. Nakajima, K. Nishimura, T. Hosotani, K. Kasai, M. Yoshida, T. Suemitsu, T. Otsuji, A. Satou

IRMMW-THz: the 47th International Conference on Infrared, Millimeter, and Terahertz Waves　2022/08/29
Pulse Response of Asymmetric Dual-Grating-Gate HEMT Plasmonic THz Detector International-presentation

Kenichi Narita, Takumi Negoro, Yuma Takida, Hiromasa Ito, Hiroaki Minamide, Tetsuya Suemitsu, Taiichi Otsuji, Akira Satou

IRMMW-THz: the 47th International Conference on Infrared, Millimeter, and Terahertz Waves　2022/09/01
Recent Advances of Grating-Gate Transistors for Fast, Sensitive, Room-Temperature Plasmonic Terahertz Detection International-presentation Invited

A. Satou, T. Otsuji

SUM: 2022 IEEE Photonics Society Summer Topicals Meeting Series　2022/07/13
Plasmon-polariton excitation and hydrodynamic rectification effects in plasmonic terahertz detector with two-dimensional diffraction grating structure International-presentation

Y. Sasaki, T. Otsuji, A. Satou

OTST 2022: The 9th International Conference on Optical Terahertz Science and Technology　2022/06/20
格子ゲート構造プラズモニックTHz検出素子におけるゲート電極からの光起電圧出力に関する検討

根来拓海,齋藤琢,鈴木雅也,細谷友崇,末光哲也,瀧田佑馬,伊藤弘昌,南出泰亜,尾辻泰一,佐藤昭

第67回応用物理学会春季学術講演会　2020/03/12
光吸収層面積縮小によるUTC-PD集積HEMTの光ダブルミキシング効率向上

西村和樹,大森雄也,細谷友崇,岩月勝美,末光哲也,尾辻泰一,佐藤昭

第67回応用物理学会春季学術講演会　2020/03/12
格子ゲート構造プラズモニックTHzディテクタのゲート電極からの光電流出力に関する検討

齋藤琢, 鈴木雅也, 細谷友崇, 尾辻泰一, 瀧田佑馬, 伊藤弘昌, 南出泰亜, 佐藤昭

テラヘルツ応用システム時限研究専門委員会(THz)共催電子デバイス研究会　2019/12/24
Sub-terahertz opt-electronics device technologies for B5G mobile communications networks International-presentation Invited

A. Satou, K. Iwatsuki, and T. Otsuji

ITRI-Tohoku University B5G Workshop 2019　2019/12/18
UTC-PD集積HEMTによる光-サブテラヘルツ波キャリア周波数下方変換

西村和樹,大森雄也,細谷友崇,岩月勝美,末光哲也,尾辻泰一,佐藤昭

シンポジウム「テラヘルツ科学の最先端V」　2019/11/29
Gate electrode as an putput port of a grating-gate plasmonic THz detector International-presentation

Taku Saito, Masaya Suzuki, Tomotaka Hosotani, Taiichi Otsuji, Y. Takida, H. Ito, H. Minamide, and Akira Satou

MTSA2019: The 5th International Symposium on Microwave/Terahertz Science and Applications　2019/09/30
UTC-PD 集積 HEMT による光ミリ波キャリア周波数下方変換 Invited

佐藤昭, 大森雄也, 西村和樹, 細谷友崇, 岩月勝美, 末光哲也, 尾辻泰一

2019年電子情報通信学会ソサエティ大会　2019/09/10
Optical-to-THz frequency down-conversion utilizing two-dimensional plasmons International-presentation

S. Manabe, T. Otsuji, and A. Satou

IRMMW-THz 2019: 44th International Conference on Infrared, Millimeter, and Terahertz Waves　2019/09/04
Photonic Double-Mixing by UTC-PD-Integrated-HEMT for Optical to MMW Carrier Frequency Down-Conversion International-presentation

K. Nishimura, Y. Omori, T. Hosotani, T. Suemitsu, K. Iwatsuki, T. Otsuji, A. Satou

TWHM2019: 13th Topical Workshop on Heterostructure Microelectronics　2019/08/27
Integration of UTC-PD structure with InGaAs HEMT for optical-to-wireless carrier frequency down-conversion International-presentation

K. Nishimura, Y. Omori, T. Hosotani, T. Suemitsu, K. Iwatsuki, T. Otsuji, and A. Satou

RJUSE2019: 8th Russia-Japan-USA-Europe Symposium on Fundamental & Applied Problems of Terahertz Devices & Technologies & GDR-I FIR-LAB Workshop　2019/07/09
Optical-to-millimeter-wave carrier frequency down-conversion by UTC-PD-integrated HEMT International-presentation

Y. Omori, T. Hosotani, T. Otsuji, K. Iwatsuki, and A. Satou

CSW: Compound Semiconductor Week　2019/05/22
Introduction of 2D nanoantennas to grating-gate plasmonic THz detector for controlling Its polarization characteristics International-presentation

M. Suzuki, T. Hosotani, T. Suemitsu, Y. Takida, H. Ito, H. Minamide, T. Otsuji, and A. Satou

OTST: Optical Terahertz Science and Technology　2019/03/12
Millimeter-wave photonic double-mixing by InGaAs-HEMTs for optical to wireless carrier frequency down-conversion International-presentation Invited

A. Satou, Y. Omori, S. Manabe, T. Hosotani, K. Iwatsuki, and T. Otsuji

The 23rd International Symposium on Nanophysics and Nanoelectronics　2019/03/12
二次元プラズモンを用いたテラヘルツ帯光-無線周波数下方変換の理論解析

眞鍋颯也, 尾辻泰一, 佐藤昭

第66回応用物理学会春季学術講演会　2019/03/11
二次元ナノアンテナ導入による格子ゲート構造プラズモニックTHzディテクタの偏光特性制御

鈴木雅也, 細谷友崇, 末光哲也, 瀧田佑馬, 伊藤弘昌, 南出泰亜, 尾辻泰一, 佐藤昭

第66回応用物理学会春季学術講演会　2019/03/11
UTC-PD-integrated HEMT for optical-to-millimeter-wave carrier frequency down-conversion International-presentation

Y. Omori, T. Hosotani, T. Otsuji, K. Iwatsuki, and A. Satou

OFC: Optical Fiber Conference　2019/03/07
格子ゲート構造プラズモニックTHzディテクタの偏光特性制御のための二次元ナノアンテナ導入

鈴木雅也, 細谷友崇, 末光哲也, 瀧田佑馬, 伊藤弘昌, 南出泰亜, 尾辻泰一, 佐藤昭

201８年電子情報通信学会電子デバイス研究会　2018/12/18
Photonic double-mixing by InGas-HEMTs for optical to MMW-THz carrier frequency down-conversion International-presentation Invited

A. Satou, Y. Omori, S. Manabe, T. Hosotani, T. Suemitsu, and T. Otsuji

ICMNE-2018: International Conference on Nano- and Micro-Electronics　2018/10/02
Carrier frequency down-conversion from optical to MMW/THz data signal using InGaAs-HEMT International-presentation Invited

A. Satou, Y. Ohmori, S. Manabe, T. Hosotani, T. Suemitsu, and T. Otsuji

RJUSE: the 7th Russia-Japan-USA-Europe Symposium on Fundamental & Applied Problems of Terahertz Devices & Technologies　2018/09/19
2D diffraction grating for controlling polarization characteristics of grating-gate plasmonic THz detector International-presentation

M. Suzuki, T. Hosotani, T. Otsuji, T. Suemitsu, Y. Takida, H. Ito, H. Minamide, and A. Satou

RJUSE: the 7th Russia-Japan-USA-Europe Symposium on Fundamental & Applied Problems of Terahertz Devices & Technologies　2018/09/19
UTC-PD構造を集積したInP-HEMTによる光-ミリ波帯周波数下方変換

大森雄也, 細谷友崇, 末光哲也, 尾辻泰一, 佐藤昭

201８年電子情報通信学会ソサエティ大会　2018/09/12
Coupling of 2D plasmons in grating-gate plasmonic THz detector to THz wave with lateral polarization International-presentation

M. Suzuki, T. Hosotani, T. Otsuji, T. Suemitsu, Y. Takida, H. Ito, H. Minamide, and A. Satou

IRMMW-THz: the 43rd International Conference on Infrared, Millimeter and Terahertz Waves　2018/09/11
THz devices based on transistors incorporated with 2D plasmonic metamaterial structures International-presentation Invited

A. Satou, M. Suzuki, T. hosotani, Y. Takida, H. Ito, H. Minamide, T. Suemitsu, and T. Otsuji

A3 Metamaterials Forum 2018　2018/08/14
Introduction of 2D Diffraction Grating into Grating-Gate Plasmonic THz Detector for Controlling Its Polarization Characteristics International-presentation

M. Suzuki, T. Hosotani, T. Otsuji1, T. Suemitsu, Y. Takida, H. Ito, H. Minamide, and A. Satou

AWAD 2018: the 26th Asia-Pacific Workshop on Fundamentals and Applications of Advanced Semiconductor Devices　2018/07/02
InP-HEMTによる光－ミリ波帯キャリア周波数下方変換

大森雄也,細谷友崇,尾辻泰一,岩月勝美,末光哲也,日隈薫,市川潤一郎,坂本高秀,山本直克,佐藤昭

電子通信情報学会2017年ED研究会　2017/12/19
Carrier-frequency down-conversion from optical data signal to MMW/THz data signal by using InP-HEMT International-presentation

Y. Omori, T. Hosotani, T. Suemitsu, K. Iwatsuki, T. Otsuji, K. Higuma, J. Ichikawa, T. Sakamoto, N. Yamamoto, and A. Satou

ISPOC 2017: International Symposium on Photonics and Optical Communications 2017　2017/10/25
High-Speed Response of Asymmetric-Dual-Grating-Gate Plasmonic THz Detector International-presentation

T. Hosotani, F. Kasuya, M. Suzuki, T. Suemitsu, T. Otsuji, Y. Takida, H. Ito, H. Minamide, T. Ishibashi, M. Shimizu, and A. Satou

RJUSE TeraTech-2017: 6th Russia-Japan-USA-Europe Symposium on Fundamental & Applied Problems of Terahertz Devices & Technologies　2017/10/03
InP-HEMTを用いたASK/BPSK光データ信号のミリ波帯IFデータ信号へのキャリア周波数下方変換

大森雄也,細谷友崇,末光哲也,尾辻泰一,岩月勝美,日隈薫,市川潤一郎, 坂本高秀,山本直克,佐藤昭

電子通信情報学会2017年ソサイエティ大会　2017/09/12
非対称二重格子ゲートHEMTの赤外光吸収特性とプラズモニックTHzフォトミキシング特性

鈴木雅也,細谷友崇,尾辻泰一,佐藤昭

第78回応用物理学会秋季学術講演会　2017/09/06
High-Speed Pulse Response of Asymmetric-Dual-Grating-Gate High-Electron-Mobility-Transistor for Plasmonic THz Detection International-presentation

T. Hosotani, F. Kasuya, M. Suzuki, T. Suemitsu, T. Otsuji, Y. Takida, H. Ito, H. Minamide, T. Ishibashi, M. Shimizu, and A. Satou

IRMMW-THz 2017: 42nd International Conference on Infrared, Millimeter, and Terahertz Waves　2017/08/28
Frequency Down-Conversion from Optical Data Signal to MMW IF Data Signal Using InP-HEMT International-presentation

Y. Omori, T. Hosotani, T. Suemitsu, K. Iwatsuki, T. Otsuji, and A. Satou

The 24th Congress of the International Commission for Optics　2017/08/22
Millimeter-Wave/Terahertz Detection and Photonic Double-Mixing By Transistors International-presentation Invited

A. Satou and T. Otsuji

SPIE Optics+Photonics　2017/08/08
Temperature-Dependent Broadening of Carrier Energy Dispersion in Graphene by Electron-Electron Interaction and Its Effect on Auger Scatterings International-presentation

T. Komatsu, V. Ryzhii, T. Otsuji, D. Svintsov, and A. Satou

EDISON 20: The 20th International Conference on Electron Dynamics in Semiconductors, Optoelectronics and Nanostructures　2017/07/17
MMW Photonic Double-Mixing and THz Plasmonic Detection Using InP HEMTs International-presentation Invited

A. Satou

Global Summit on Laser Optics and Photonics 2017　2017/06/19
Lens-integrated asymmetric-dual-grating- gate high-electron-mobility-transistor for plasmonic terahertz detection International-presentation

T. Hosotani, F. Kasuya, H. Taniguchi, T. Watanabe, T. Suemitsu, T. Otsuji, T. Ishibashi, M. Shimizu, and A. Satou

IMS-2017: 2017 International Microwave Symposium　2017/06/06
直列アレイ化とレンズ集積による非対称二重格子ゲート高電子移動度トランジスタのテラヘルツ波受光効率向上

細谷友崇, 糟谷文月, 谷口弘樹, 渡辺隆之, 末光哲也, 尾辻泰一, 瀧田佑馬, 伊藤弘昌, 南出泰亜, 石橋忠夫, 清水誠, 佐藤昭

信学会電子デバイス研究会　2016/12/19
Array configuration and silicon-lens integration of asymmetric dual-grating-gate HEMT for improvement of light coupling efficiency International-presentation

F. Kasuya, H. Taniguchi, T. Watanabe, T. Suemitsu, T. Otsuji, T. Ishibashi, M. Shimizu, Y. Takida, H. Ito, H. Minamide, A. Satou

RJUSE: 5th Russia-Japan-USA-Europe Symposium on Fundamental & Applied Problems of Terahertz Devices & Technologies　2016/10/31
InP HEMT and graphene FET for optical to sub-THz carrier frequency conversion International-presentation

A. Satou, K. Sugawara, G. Tamamushi, T. Watanabe, A. Dobroiu, T. Suemitsu, H. Fukidome, M. Suemitsu, V. Ryzhii, K. Iwatsuki, S. Kuwano, J. Kani, J. Terada, T. Otsuji

RJUSE: 5th Russia-Japan-USA-Europe Symposium on Fundamental & Applied Problems of Terahertz Devices & Technologies　2016/11/01
A numerical model for finite-temperature self-energy in doped graphene with electron-electron interaction International-presentation

T. Komatsu, T. Otsuji, V. Ryzhii, D. Svintsov, V. Vyurkov, A. Satou

Graphene Canada: Graphene & 2D Materials International Conference and Exhibition　2016/10/18
Array configuration and silicon-lens integration of asymmetric dual-grating-gate plasmonic THz detectors International-presentation

F. Kasuya, H. Taniguchi, T. Watanabe, T. Suemitsu, T. Otsuji, T. Ishibashi, M. Shimizu, Y. Takida, H. Ito, H. Minamide, A. Satou

IRMMW-THz: 41st International Conference on Infrared, Millimeter and Terahertz Waves　2016/09/25
Nanostructured asymmetric dual-grating-gate plasmonic THz detectors: enhancement of external coupling efficiency by array configuration and silicon-lens integration International-presentation

F. Kasuya, H. Taniguchi, T. Watanabe, T. Suemitsu, T. Otsuji, Y. Takida, H. Ito, H. Minamide, T. Ishibashi, M. Shimizu, A. Satou

IEEE NANO 2016: the 2016 IEEE 16th International Conference on Nanotechnology　2016/08/22
A fitting model for extraction of intrinsic transistor parameters in graphene FETs International-presentation

J. Mitsushio, G. Tamamushi, K. Sugawara, A. Satou, T. Suemitsu, H. Fukidome, M. Suemitsu, T. Otsuji

AWAD 2016: Asia-Pacific Workshop on Fundamentals and Applications of Advanced Semiconductor Devices　2016/07/04
Sub-THz Photonic Double-Mixing Conversion Using Transistors International-presentation

A. Satou, K. Sugawara, G. Tamamushi, T. Watanabe, A. Dobroiu, T. Suemitsu, H. Fukidome, M. Suemitsu, V. Ryzhii, K. Iwatsuki, S. Kuwano, J. Kani, J. Terada, T. Otsuji

AWAD 2016: Asia-Pacific Workshop on Fundamentals and Applications of Advanced Semiconductor Devices　2016/07/04
Extraction of intrinsic and extrinsic parameters of graphene field-effect transistor from Its asymmetric I-V characteristic International-presentation

A. Satou, G. Tamamushi, K. Sugawara, J. Mitsushio, V. Ryzhii, T. Otsuji

CSW: Conpound Semiconductor Week 2016, a joint venue for the 43rd International Symposium on Compound Semiconductors (ISCS) and the 28th International Conference on Indium Phosphide and Related Materials (IPRM)　2016/06/26
Plasmonic THz devices based on InP HEMTs and Graphene FETs International-presentation Invited

A. Satou, T. Watanabe, T. Suemitsu, V. Ryzhii, D. Fateev, V. V. Popov, T. Otsuji

EMN Meeting on Terahertz　2016/05/14
Cooperative promotion of plasma instabilities for emission of terahertz radiation in an asymmetric dual-grating gate graphene-channel FET International-presentation

A. Satou, Y. Koseki, T. Watanabe, V. V. Popov, V. Ryzhii, T. Otsuji

SPIE DCS: Int. Conf. on Defense + Commercial Sensing, Conference 9856 on Terahertz Physics, Devices, and Systems X: Advanced Applications in Industry and Defense　2016/04/17
有限温度でのグラフェン内電子間相互作用によるエネルギー分散補正の計算モデル構築

小松竜大, 尾辻泰一, Victor Ryzhii, Dmitry Svintsov, Vladimir Vyurkov, 佐藤昭

第63回応用物理学会春季学術講演会　2016/03/19
グラフェンFETにおける真性トランジスタパラメータ抽出用モデルの評価

満塩純希, 玉虫元, 菅原健太, 佐藤昭, 末光哲也, 吹留博一, 末光眞希, 尾辻泰一

第63回応用物理学会春季学術講演会　2016/03/19
非対称二重格子ゲート・プラズモニックTHz波検出器のアレイ化と超半球シリコンレンズ集積による受光効率向上

谷口弘樹, 糟谷文月, 渡辺隆之, 末光哲也, 尾辻泰一, 瀧田佑馬, 伊藤弘昌, 南出泰亜, 石橋忠夫, 清水誠, 佐藤昭

第63回応用物理学会春季学術講演会　2016/03/19
THz devices based on plasmons in 2D electron systems International-presentation Invited

A. Satou, T. Watanabe, T. Suemitsu, V. Ryzhii, D. Fateev, V. V. Popov, T. Otsuji

XX International Symposium “Nanophysics & Nanoelectronics　2016/03/14
グラフェンチャネルFETにおける真性パラメータの抽出

玉虫元, 菅原健太, 佐藤昭, 田島圭一郎, 吹留博一, 末光眞希, 尾辻泰一

電気通信情報学会2015年電子デバイス研究会　2015/12/21
非対称性指数向上とアレイ化による非対称二重格子ゲートHEMTの検出感度向上

糟谷文月, 川﨑鉄哉, 渡辺隆之, Stephane Boubanga Tombet, 末光哲也, 尾辻泰一, 瀧田佑馬, 伊藤弘昌, 南出泰亜, 佐藤昭

2015年電子情報通信学会ソサイエティ大会　2015/09/08
Broadband characteristics of ultrahigh responsivity of asymmetric dual-grating-gate plasmonic terahertz detectors International-presentation

F. Kasuya, T. Kawasaki, S. Hatakeyama, S. Boubanga Tombet, T. Suemitsu, T. Otsuji, G. Ducournau, D. Coquillat, Wojciech Knap, Y. Takida, H. Ito, H. Minamide, D. V. Fateev, V. V. Popov, Y. M. Meziani, A. Satou

40th International Conference on Infrared, Millimeter and Terahertz Waves　2015/08/23
Computational study of plasmon instabilities in dual-grating-gate graphene transistor International-presentation

A. Satou, Y. Koseki, V. Ryzhii, V. V. Popov, T. Otsuji

EDISON 19: 19th International Conference on Electron Dynamics in Semiconductors, Optoelectronics, and Nanostructures　2015/06/29
Computational study of graphene plasmons: damping mechanisms and instabilities International-presentation Invited

A. Satou, Y. Koseki, V. Ryzhii, V. V. Popov, T. Otsuji

RJUS TeraTech-2015: The 4th Russia-Japan-USA Symposium: The Fundamental & Applied Problems of Terahertz Devices & Technologies　2015/06/09
非対称二重格子ゲート構造を有するグラフェントランジスタにおけるプラズマ不安定性

小関勇気, Victor Ryzhii, 尾辻泰一, Viacheslav V. Popov, 佐藤昭

第62回応用物理学会春季学術講演会　2015/03/12
非対称二重格子ゲートHEMTによるテラヘルツ波検出の周波数特性

佐藤昭, Stephane Boubanga Tombet, 渡辺隆之, 川﨑鉄哉, 糟谷文月, 末光哲也, Denis V. Fateev, Vyacheslav V. Popov, 南出泰亜, 伊藤弘昌, Dominique Coquillat, Wojciech Knap, Guillaume Ducournau, Yahya M. Meziani, 尾辻泰一

第62回応用物理学会春季学術講演会　2015/03/12
超高速テラヘルツ無線を支える光電子デバイス技術の動向 Invited

佐藤昭, 尾辻泰一

2015年電子情報通信学会総合大会　2015/03/10
Geometrical dependences of ultrahigh responsivity and its broadband characteristics of InP-based asymmetric dual-grating-gate high-electron-mobility transistors International-presentation

A. Satou, T. Kawasaki, S. Hatakeyama, S. Boubanga Tombet, T. Suemitsu, G. Ducournau, D. Coquillat, W. Knap, D. V. Fateev, V. V. Popov, Y. M. Meziani, T. Otsuji

OTST 2015: Optical Terahertz Science and Technology 2015　2015/03/08
Room-Temperature, Zero-Bias Plasmonic THz Detection by Asymmetric Dual-Grating-Gate HEMT International-presentation

T. Watanabe, A. Satou, S. Boubanga Tombet, T. Suemitsu, G. Ducournau, D. Coquillat, W. Knap, H. Minamide, H. Ito, V. V. Popov, Y. M. Meziani, T. Otsuji

Photonics West 2015　2015/02/07
非対称二重格子ゲート高電子移動度トランジスタを用いたプラズモニックテラヘルツ検出の広帯域特性

佐藤昭, Stephane Boubanga Tombet, 渡辺隆之, 川﨑鉄哉, 末光哲也, Denis V. Fateev, Vyacheslav V. Popov, 南出泰亜, 伊藤弘昌, Dominique Coquillat, Wojciech Knap, Guillaume Ducournau, 尾辻泰一

電気通信情報学会2014年電子デバイス研究会　2014/12/23
Effects of carrier-carrier scattering on graphene terahertz/photonic devices International-presentation

A. Satou, V. Ryzhii, V. Mitin, F. T. Vasko, T. Otsuji

ICPS 2014: Effects of carrier-carrier scattering on graphene terahertz/photonic devices　2014/08/10
Damping mechanism of terahertz plasmons in graphene on heavily-doped substrate International-presentation

Y. Koseki, A. Satou, V. Ryzhii, V. Vyurkov, T. Otsuji

ICPS 2014: Effects of carrier-carrier scattering on graphene terahertz/photonic devices　2014/08/10
Damping mechanism of terahertz plasmons in graphene on heavily-doped substrate International-presentation

Y. Koseki, A. Satou, V. Ryzhii, V. Vyurkov, T. Otsuji

RJUS TeraTech-2014: The 3rd Russia-Japan-USA Symposium: The Fundamental & Applied Problems of Terahertz Devices & Technologies　2014/06/18
Ultrahigh sensitive sub-THz plasmonic detector based on asymmetric dual-grating-gate HEMT International-presentation Invited

A. Satou, Y. Kurita, G. Ducournau, D. Coquillat, K. Kobayashi, S. Boubanga Tombet, Y. M. Meziani, V. V. Popov, W. Knap, T. Suemitsu, T. Otsuji

RJUS TeraTech-2014: The 3rd Russia-Japan-USA Symposium: The Fundamental & Applied Problems of Terahertz Devices & Technologies　2014/06/18
Kinetic transport model with carrier-carrier scattering for graphene terahertz/photonic device simulation International-presentation

A. Satou, V. Ryzhii, V. Mitin, F. T. Vasko, T. Otsuji

IWCE 2014: International Workshop on Computational Electronics　2014/06/03
グラフェンテラヘルツプラズモンのドープ基板表面プラズモンとの結合による減衰の解析

小関勇気, 佐藤昭, V. Ryzhii, V. Vyurkov, 尾辻泰一

第61回応用物理学会春季学術講演会　2014/03/17
二次元プラズモンのTHz波デバイス応用 Invited

佐藤昭, V. Ryzhii, 尾辻泰一

応用電子物性分科会研究例会　2013/10/01
Damping of terahertz plasmons in graphene by heavily-doped substrate International-presentation

A. Satou, Y. Koseki, V. Ryzhii, T. Otsuji

RPGR 2013: Recent Progress on Graphene Research　2013/09/09
Simulation of terahertz plasmons in graphene with grating-gate structures International-presentation

A. Satou, V. Ryzhii, F. T. Vasko, V. V. Mitin, T. Otsuji

SISPAD 2013: The International Conference on Simulation of emiconductor Processes and Devices　2013/09/03
Frequency dispersion and damping mechanisms of terahertz plasmons in graphene transistor structures International-presentation

A. Satou, V. Ryzhii, F. T. Vasko, V. V. Mitin, T. Otsuji

EDISON 18: 18th International Conference on Electron Dynamics in Semiconductors, Optoelectronics, and Nanostructures　2013/07/22
Frequency dispersion and damping mechanisms of terahertz plasmons in graphene transistor structures International-presentation

A. Satou, V. Ryzhii, F. T. Vasko, V. V. Mitin, T. Otsuji

CLEO 2013: Conference on Lasers and Electro-Optics　2013/06/09
Frequency dispersion and damping mechanisms of THz plasmons in graphene transistor structures International-presentation Invited

A. Satou

RJUS TeraTech-2013: The 2nd Russia-Japan-USA Symposium: The Fundamental & Applied Problems of Terahertz Devices & Technologies　2013/06/03
グラフェンにおけるテラヘルツ二次元プラズモンのシミュレーションによる解析

佐藤昭, V. Ryzhii, V. V. Mitin, F. T. Vasko, 尾辻泰一

電気通信情報学会2013年エレクトロニクスシミュレーション研究会　2013/05/10
グラフェンを用いたテラヘルツ波素子応用 Invited

佐藤昭

日本真空学会2013年5月研究例会・日本表面科学会第77回表面科学研究会　2013/05/09
Graphene terahertz lasers: injection versus optical pumping International-presentation

A. Satou, V. Ryzhii, T. Otsuji, M. Ryzhii, V. Mitin, M. Shur

GSMM 2013: 6th Global Symposium on Millimeter-Waves 2013　2013/04/21
Terahertz population inversion and negative dynamic conductivity in optically pumped graphene: dependence on pumping photon energy International-presentation

A. Satou, Y. Kurita, T. Otsuji, V. Ryzhii

OTST 2013: Optical Terahertz Science and Technology 2013　2013/04/01
グラフェンにおけるテラヘルツ二次元プラズモンの周波数分散および減衰機構

佐藤昭, ヴィクトールリズィー, ウラジミールミチン, フェデールバスコ, 尾辻泰一

第60回応用物理学会春季学術講演会　2013/03/29
Numerical simulation of terahertz plasmons in gated graphene structures International-presentation

A. Satou, T. Otsuji, F. T. Vasko, V. V. Mitin, V. Ryzhii

Photonics West 2013　2013/02/02
光パルス励起によるグラフェン内テラヘルツ反転分布形成

佐藤昭, ヴィクトールリズィー, 栗田裕記, 尾辻泰一

電子通信情報学会2012年電子デバイス研究会　2012/12/17
Simulation of terahertz plasmons in graphene and heterostructure two-dimensional electron gas International-presentation

A. Satou, H. Shida, V. Ryzhii, T. Otsuji, V. V. Popov

TeraNano 2012: 2nd International Symposium on Terahertz Nanoscience　2012/12/10
Numerical study of plasmons in gated graphene structures International-presentation

A. Satou, T. Otsuji, F. T. Vasko, V. V. Mitin, V. Ryzhii

TeraNano III: 3rd International Symposium on Terahertz Nanoscience　2012/12/10
Theoretical study of terahertz plasma instability in asymmetric double-grating-gate transistor structures International-presentation

A. Satou, H. Shida, T. Otsuji, V. V. Popov

ICMNE 2012: International Conference on Micro- and Nano-Electronics　2012/10/01
二重格子ゲートＨＥＭT内二次元電子ガスにおけるプラズマ不安定性

佐藤昭, 志田広海, Viacheslav V. Popov, 尾辻泰一

電子通信情報学会2012年レーザー量子エレクトロニクス研究会　2012/08/23
Plasma instability of two-dimensional electron gas in double-grating-gate transistor structure International-presentation

A. Satou, H. Shida, T. Otsuji, V. V. Popov

IWCE 2012: International Workshop on Computational Electronics　2012/05/22
Terahertz negative dynamic conductivity in optically pumped graphene International-presentation

A. Satou, T. Otsuji, V. Ryzhii, F. T. Vasko

PIERS 2012: Progress In Electromagnetics Research Symposium　2012/03/27
二重格子ゲートトランジスタ構造における二次元プラズマ不安定性

佐藤昭, 志田広海, Viacheslav V. Popov, 尾辻泰一

第59回応用物理学会春季学術講演会　2012/03/15
Population inversion in optically pumped graphene: effect of carrier-carrier scattering International-presentation

A. Satou, T. Otsuji, V. Ryzhii, F. T. Vasko

TeraNano 2011: 1st International Symposium on Terahertz Nanoscience　2011/11/24
Threshold of terahertz wave amplification from optically pumped graphene International-presentation Invited

A. Satou, S. Boubanga-Tombet, T. Otsuji, V. Ryzhii

ACSIN-2011: 11th International Conference on Atomically Controlled Surfaces　2011/10/02
The effect of carrier-carrier scattering on population inversion in optically pumped graphene International-presentation

A. Satou, T. Otsuji, V. Ryzhii, F. T. Vasko

EP2DS-19: Electronic Properties of Two-Dimensional Systems　2011/07/25
Threshold behavior of stimulated terahertz emission from optically pumped graphene International-presentation

A. Satou, S. Boubanga-Tombet, V. Ryzhii, T. Otsuji

NT 2011: Nanotube 2011　2011/07/15
Stimulated terahertz emission from optically pumped graphene and its threshold behavior International-presentation

A. Satou, S. A. Boubanga Tombet, T. Otsuji, V. Ryzhii

Graphene 2011　2011/04/11
光学励起グラフェンの非平衡キャリア緩和過程とテラヘルツ帯における反転分布

佐藤昭, ヴィクトールリズィー, ステファンボウバンガ・トムベット, 尾辻泰一

電子通信情報学会2010年電子デバイス研究会　2010/12/16
Theoretical study of population inversion in graphene under pulse excitation International-presentation

A. Satou, T. Otsuji, V. Ryzhii

ISGD 2010: International Symposium on Graphene Devices　2010/10/27
Study of hot carriers in optically pumped graphene International-presentation

A. Satou, T. Otsuji, V. Ryzhii

SSDM 2010: International Conference on Solid State Devices and Materials　2010/09/22
グラフェンによるテラヘルツ波光源 Invited

佐藤昭, 尾辻泰一, ヴィクトールリズィー

電気通信情報学会2010年ソサイエティ大会　2010/09/14
Terahertz lasing in optically pumped epitaxial multiple graphene International-presentation

M. Ryzhii, N. Ryabova, V. Ryzhii, T. Otsuji, A. Dubinov, V. Ya

TeraTech'09 (International Workshop on Terahertz Technology)　2009/11/30
Terahertz/far-infrared lasing by utilization of population inversion in graphene under optical pumping International-presentation

V. Ryzhii, F. T. Vasko, T. Otsuji, V. Ya. Aleshkin, A. A. Dubinov

EP2DS 18 (International Conference on Electronic Properties of Two-Dimensional Systems)　2009/07/19
Numerical simulation of plasma waves in high-electron-mobility transistors using kinetic transport model International-presentation

A. Satou, V. Ryzhii, N. Vagidov, V. Mitin

IWCE-13 (International Workshop on Computational Electronics)　2009/05/27
Graphene under optical pumping: nonequilibrium distributions, population inversion, and terahertz lasing International-presentation

A. Satou, V. Ryzhii, M. Ryzhii, F. T. Vasko, T. Otsuji

SPIE Photonics West 2009　2009/01/24
Effect of contacts on THz plasma resonances in two-dimensional systems International-presentation

A. Satou, V. Ryzhii, N. Vagidov, V. Mitin, T. Otsuji

SISPAD 2008 (International Conference on Simulation of Semiconductor Processes and Devices)　2008
Plasma waves in graphene heterostructures and their terahertz device applications International-presentation Invited

A. Satou, V. Ryzhii, M. Ryzhii, F. T. Vasko, T. Otsuji

ISDRS 2007 (International Semiconductor Device Research Symposium)　2007/12/12

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Modeling of resonant terahertz detector with two-dimensional electron gas and lateral Schottky junction International-presentation

A. Satou, N. Vagidov, V. Ryzhii, V. Mitin

APS March Meeting　2007
ヘテロ構造ゲート／アンゲート型二次元電子チャネル内プラズマ振動とドレイン／ソースショットキー接合を用いた共鳴テラヘルツ波検出器

A. Satou, N. Vagidov, V. Ryzhii

電子情報通信学会電子デバイス研究会　2006/12/08
Resonant terahertz detection antenna utilizing plasma oscillations in lateral Schottky diode International-presentation

A. Satou, V. Ryzhii, T. Otsuji, M. S. Shur

IWTND 2006 (International Workshop “Tera- and Nano-Devices: Physics and Modeling”)　2006/10/16
Resonant detectors of terahertz radiation based on two-dimensional electron systems with lateral Schottky junction International-presentation

A. Satou, V. Ryzhii, T. Otsuji, M. S. Shur

IRMMW-THz2006 (Joint 31st International Conference on Infrared and Millimeter Waves and 14th International Conference on Terahertz Electronics)　2006/09/18
Resonant terahertz detection based on high-electron-mobility transistor with Schottky source/drain contact International-presentation

A. Satou, V. Ryzhii, T. Otsuji, M. S. Shur

SSDM 2006 (International Conference on Solid State Devices and Materials)　2006/09/12
Plasma effects in lateral Schottky junction terahertz detector: Models and characteristics International-presentation

A. Satou, V. Ryzhii, M. S. Shur

IWCE-11 (International workshop on computational electronics)　2006/05/25
Resonant terahertz detectors with lateral Schottky junctions International-presentation

A. Satou, V. Ryzhii, T. Otsuji, M. S. Shur

AWAD2006 (Asia-Pacific Workshop on Fundamental and Application of Advanced Semiconductor Devices)　2006
Spectra of standing and traveling waves in two-dimensional electron channels International-presentation

A. Satou, A. Chaplik, V. Ryzhii, M. S. Shur

EP2DS-16 (International Conference on Electronic Properties of Two-Dimensional Systems)　2005/07/10
ラマン分光法の裏面適用によるプロセス中のグラフェン膜質評価

関宏信,田村紘一, 唐超,吹留博一,佐藤昭,尾辻泰一

第70回応用物理学会春季学術講演会　2023/03/17
A distributed model of the asymmetric-gated graphene Coulomb-drag-effect transistor for terahertz applications International-presentation

C. Tang, K. Tamura, A. Satou, V. Ryzhii, T. Otsuji

RPGR: Recent Progress on Graphene and related 2D materials Research International Conference　2022/11/14
Single-asymmetric-gated graphene field-effect transistor for terahertz applications International-presentation

Chao Tang, Koichi Tamura, Akira Satou, Victor Ryzhii, Taiichi Otsuji

SSDM: International Conference on Solid State Devices and Materials　2022/09/27
グラフェンFETにおけるユニポーラ動作による光熱電型高速テラヘルツ検出の実現

田村紘一, 唐超, 荻浦大地, 諏訪健斗, 吹留博一, 佐藤昭, 瀧田佑馬, 南出泰亜, 末光哲也, 尾辻泰一

第83回応用物理学会秋季学術講演会　2022/09/21
SiC表面におけるh-BNへのグラフェンヘテロ成長

小濱路生, 米窪和輝, 杉野秀明, 渡邊一世, 菅原大樹, 唐超, 佐藤昭, 尾辻泰一, 吹留博一

第83回応用物理学会秋季学術講演会　2022/09/21
Asymmetric FET structure on graphene for terahertz applications International-presentation

C. Tang, K. Tamura, A. Satou, V. Ryzhii, T. Otsuji

TWHM: Topical Workshop on Heterostructure Microelectronics　2022/08/30
Recent advances in the research of graphene plasmonic terahertz laser transistors International-presentation Invited

T. Otsuji, A. Satou, S.A. Boubanga-Tombet, H. Fukidome, M. Ryzhii, K. Narahara, V. Mitin, M.S. Shur, V. Ryzhii

the 241st ECS Meeting　2022/05/29
Controlling the PT symmetry of Dirac plasmons in dual-grating-gate graphene THz laser transistors for ultrafast gain switching International-presentation

Taiichi Otsuji, Akira Satou, Hirokazu Fukidome, Maxim Ryzhii, Victor Ryzhii, Koichi Narahara

CLEO: Conference on Lasers and Electro-Optics 2022　2022/05/15
非対称二重格子ゲートHEMTテラヘルツ検出素子のパルス応答

根来拓海, 成田健一, 瀧田佑馬, 伊藤弘昌, 南出泰亜, 尾辻泰一, 佐藤昭

第69回応用物理学会春季学術講演会　2022/03/25
光サブキャリア信号高強度化によるUTC-PD集積HEMTの光ダブルミキシング変換利得向上

中嶋大, 西村和樹, 岩月勝美, 末光哲也, 尾辻泰一, 葛西恵介, 吉田真人, 佐藤昭

信学総全大　2022/03/17
Graphene-based plasmonic metamaterial for terahertz laser transistors International-presentation Invited

T. Otsuji, S. Boubanga-Tombet, A. Satou, D. Yadav, V. Ryzhii, M. Ryzhii, A.A. Dubinov, V.V. Popov, W. Knap, V. Kachorovskii, K. Narahara, V. Mitin, M.S. Shur

XXVI International Symposium on Nanophysics and Nanoelectronics
Controlling the parity and time-reversal symmetry of non-Hermitian graphene Dirac plasmons and its application to terahertz lasers International-presentation

T. Otsuji, A. Satou, H. Fukidome, M. Ryzhii, V. Ryzhii, K. Narahara

WINDS: the Workshop on Innovative Nanoscale Devices and Systems Abstracts Booklet
High Speed Terahertz Detection by an Asymmetric Dual-Grating-Gate Graphene FET International-presentation

K. Tamura, D. Ogiura, K. Suwa, H. Fukidome, A. Satou, Y. Takida, H. Minamide, T. Otsuji

RJUSE-TeraTech2021: 9th Russia-Japan-USA-Europe Symposium on Fundamental & Applied Problems of Terahertz Devices & Technologies Tech. Dig
Giant enhancement of photovoltage from InP-based dual-grating-gate HEMT plasmonic THz detector due to 3D rectification effect International-presentation

T. Negoro, T. Hosotani, Y. Takida, H. Ito, H. Minamide, T. Otsuji, A. Satou

RJUSE-TeraTech2021: 9th Russia-Japan-USA-Europe Symposium on Fundamental & Applied Problems of Terahertz Devices & Technologies Tech. Dig
Model analysis of 2D plasmon-polariton in plasmonic THz detectors with 2D diffraction grating structure International-presentation

Y. Sasaki, T. Otsuji, A. Satou

RJUSE-TeraTech2021: 9th Russia-Japan-USA-Europe Symposium on Fundamental & Applied Problems of Terahertz Devices & Technologies Tech. Dig
Scaling rule of double-mixing conversion gain of UTC-PD-integrated HEMT on UTC-PD mesa size International-presentation

D. Nakajima, K. Nishimura, Y. Omori, T. Hosotani, T. Suemitsu, K. Iwatsuki, T. Otsuji, A. Satou

RJUSE-TeraTech2021: 9th Russia-Japan-USA-Europe Symposium on Fundamental & Applied Problems of Terahertz Devices & Technologies Tech. Dig
Controlling the PT symmetry of graphene Dirac plasmons and its application to terahertz laser transistors International-presentation Invited

T. Otsuji, A. Satou, V. Ryzhii, H. Fukidome, M. Ryzhii, K. Narahara

ICMNE: the 14th International Conference on Micro- and Nanoelectronics 2021
Fast terahertz detection in an asymmetric dual-grating-gate epitaxial graphene-channel FET International-presentation

D. Ogiura, A. Satou, H. Fukidome, T. Otsuji

RPGR: Recent Progress on Graphene and 2D materials Research Conference 2021 Proceedings
UTC-PD 集積 HEMT 光ダブルミキサへの格子状ソース電極の導入

中嶋大, 西村和樹, 大森雄也, 細谷友崇, 岩月勝美, 末光哲也, 尾辻泰一, 佐藤昭

信学会ソサエティ大会講演予稿集
二重格子ゲート・プラズモニックTHzディテクタにおける三次元整流効果

佐藤昭, 根来拓海, 細谷友崇, 瀧田佑馬, 伊藤弘昌, 南出泰亜, 尾辻泰一

第82回応用物理学会秋季学術講演会
3D rectification effect in InP-HEMT-based grating-gate plasmonic THz detector International-presentation

A. Satou, T. Hosotani, T. Negoro, Y. Takida, H. Ito, H. Minamide, T. Otsuji

URSI-GASS: the XXXIV General Assembly and Scientific Symposium (GASS) of the International Union of Radio Science
THz emission in a dual-grating-gate HEMT promoted by the plasmonic boom instability International-presentation

T. Hosotani, A. Satou, T. Otsuji

IRMMW-THz: the 46th International Conference on Infrared, Millimeter and Terahertz Waves Proc
3D rectification effect on plasmonic THz detection by InP-based dual-grating-gate high-electron-mobility transistor International-presentation

T. Negoro, T. Hosotani, Y. Takida, H. Ito, H. Minamide, T. Otsuji, A. Satou

IRMMW-THz: the 46th International Conference on Infrared, Millimeter and Terahertz Waves Proc
THz detection by an asymmetric dual-grating-gate graphene FET International-presentation

K. Tamura, D. Ogiura, K. Suwa, H. Fukidome, A. Satou, Y. Takida, H. Minamide, T. Otsuji

IRMMW-THz: the 46th International Conference on Infrared, Millimeter and Terahertz Waves Proc
Modal Analysis Of Plasmon-Polaritons In Plasmonic THz Detector Integrated With Two-Dimensional Nano-Antennas International-presentation

Y. Sasaki, T. Otsuji, A. Satou

IRMMW-THz: the 46th International Conference on Infrared, Millimeter and Terahertz Waves Proc
Controlling the parity and time-reversal symmetry of graphene Dirac plasmons and its application to terahertz lasers International-presentation Invited

T. Otsuji, A. Satou, V. Ryzhii, H. Fukidome, K. Narahara

AAAFM-UCLA2021: International Conference on Advances in Functional Materials Abstract Book
1-THz plasmonic double-mixing in a dual-grating-gate high-electron mobility transistor International-presentation

T. Hosotani, A. Satou, Y. Takida, H. Ito, H. Minamide, T. Otsuji

CLEO-EU: International Conference on Lasers and Electro-Optics Europe Tech. Dig
Optical-to-Wireless Carrier Frequency Down-Conversion by UTC-PD-Integrated HEMT: Dependence of Conversion Gain on UTC-PD Mesa Size International-presentation

Kazuki Nishimura, Tomotaka Hosotani, Dai Nakajima, Tetsuya Suemitsu, Katsumi Iwatsuki, Taiichi Otsuji, Akira Satou

CLEO-EU: International Conference on Lasers and Electro-Optics Europe Tech. Dig
Fast terahertz detection in asymmetric dual-grating-gate graphene-channel FETs International-presentation

Koichi Tamura, Daichi Ogiura, Kento Suwa, Hirokazu Fukidome, Akira Satou, Y. Takida, H. Minamide, T. Otsuji

DRC: 79th Annual Device Research Conference Dig　2021/06/21
2D plasmon-polariton excitation in plasmonic THz detector with 2D diffraction grating structure International-presentation

Y. Sasaki, T. Otsuji, A. Satou

IWCN: the International Workshop on Computational Nanotechnology Book of Abstracts　2021/05/24
Bias voltage dependency of plasmonic instability and terahertz radiation in a dual-grating-gate high-electron-mobility transistor International-presentation

T. Hosotani, A. Satou, T. Otsuji

CLEO: International Conference on Lasers and Electro-Optics Tech. Dig　2021/05/13
Giant Enhancement of Photovoltage from InGaAs-Channel Dual-Grating-Gate HEMT THz Detector due to Nonlinear Rectification Effect at InGaAs/InAlAs Heterobarrier International-presentation

A. Satou, T. Hosotani, T. Negoro, Y. Takida, H. Ito, H. Minamide, T. Otsuji

CLEO: International Conference on Lasers and Electro-Optics Tech. Dig　2021/05/13
二重回折格子状ゲートHEMTにおけるプラズモン不安定性動作機構のゲートバイアス依存性

細谷友崇, 佐藤昭, 尾辻泰一

第68回応用物理学会春季学術講演会予稿集　2021/03/17
UTC-PDメサ面積縮小によるUTC-PD集積HEMTの光－ミリ波キャリア周波数下方変換利得向上

西村和樹, 大森雄也, 細谷友崇, 岩月勝美, 末光哲也, 尾辻泰一, 佐藤昭

信学総全大予稿集　2021/03/10
非対称二重格子ゲートを有するグラフェントランジスタにおけるプラズモン不安定性とそのテラヘルツ光源応用

荻浦大地, 佐藤昭, 吹留博一, 尾辻泰一

第７５回応用物理学会東北支部学術講演会予稿集　2020/12/04
格子ゲート構造高電子移動度トランジスタを用いたTHz 検出におけるゲート電極からの光起電圧出力に関する研究

根来拓海, 齋藤琢, 細谷友崇, 尾辻泰一, 瀧田佑馬, 伊藤弘昌, 南出泰亜, 佐藤昭

第７５回応用物理学会東北支部学術講演会予稿集
二次元回折格子構造金属ナノアンテナを有するプラズモニックTHz 検出素子におけるプラズモン・ポラリトンのスペクトル解析

佐々木悠真, 尾辻泰一, 佐藤昭

第７５回応用物理学会東北支部学術講演会予稿集　2020/12/04
Terahertz emission with plasmonic photomixer in and InGaAs-based dual-grating-gate high-electron-mobility transistor International-presentation

T. Hosotani, A. Satou, T. Otsuji

MRS Fall Meeting 2020
Gate-readout of photovoltage from a grating-gate plasmonic THz detector International-presentation Invited

T. Negoro, T. Saito, T. Hosotani, T. Otsuji, Y Takida, H. Ito, H. Minamide, A. Satou

IRMMW-THz: 45th Int. Conf. on Infrared, Millimeter, and Terahertz Waves
Terahertz emission in an asymmetric dual-grating-gate high-electron mobility transistor plasmonic photomixer under dc current flow International-presentation

T. Hosotani, A. Satou, T. Otsuji

IRMMW-THz: 45th Int. Conf. on Infrared, Millimeter, and Terahertz Waves
Improved sensitivity of surface-enhanced Raman spectroscopy (SERS) substrates using monolayer graphene International-presentation

T. Uchino, K. Shiga, K. Imai, M. Kusano, H. Fukidome, A. Satou, T. Otsuji

MNC2020: 33rd Int. Microprocesses and Nanotechnology Conference Dig
二次元プラズモンを用いたTHzディテクタの新展開 Invited

佐藤昭, 根来拓海, 齋藤琢, 鈴木雅也, 細谷友崇, 瀧田佑馬, 伊藤弘昌, 南出泰亜, 尾辻泰一

シンポジウム「テラヘルツ科学の最先端VII」
Process development and crystal quality evaluation of van der Waals nanocapacitors using graphene/h-BN heterostructures stacked by a transfer/stacking method International-presentation

H. Sugawara, K. Suwa, H. Fukidome, J. A. Delgado-Notario, A. Satou, T. Otsuji

The 6th International Workshop on 2D Materials A3-Foresight Program Abstract Book
InGaAs系DGG-HEMT中でのフォトミキシングによるテラヘルツ放射

細谷友崇, 佐藤昭, 尾辻泰一

第81回応用物理学会秋季学術講演会予稿集
二次元回折構造プラズモニックTHz検出素子におけるプラズモン・ポラリトンのモード解析

佐々木悠真, 尾辻泰一, 佐藤昭

第81回応用物理学会秋季学術講演会予稿集
グラフェン/h-BNファンデルワールス積層構造ナノキャパシタの転写スタック法によるプロセス開発と結晶品質評価

菅原大樹, 諏訪健斗, 吹留博一, Juan Antonio Delgado-Notario, 佐藤昭, 尾辻泰一

第81回応用物理学会秋季学術講演会予稿集
A novel grating-gate plasmonic THz detector with photovoltage gate-readout for use in high-speed wireless communications International-presentation

T. Negoro, T. Saito, T. Hosotani, T. Otsuji, Y. Takida, H. Ito, H. Minamide, A. Satou

DRC: 78th Annual Device Research Conference Dig
Realization of the high-performance graphene transistor by controlling the interface between graphene and gate dielectric International-presentation

T. Komiyama\\, T. Watanabe\\, S. Morozov\\, M. Fadeev\\, V. Utochkin\\, H. Fukidome\\, A. Satou\\, andT. Otsuji

RPGR2019: Recent Progress on Graphene and 2D Materials　2019/10/07
Terahertz Light Amplification and Lasing in Current-Driven Graphene-Channel Transistor Structures International-presentation Invited

S. Boubanga-Tombet\\, D. Yadav\\, A. Satou\\, W. Knap\\, V.V. Popov\\, and T. Otsuji

2D MATERIALS 2019 - International Congress on Graphene, 2D Materials and Applications
Graphene for Room-Temperature Operating Terahertz Coherent Light Sources International-presentation Invited

A. Satou and T. Otsuji

MTSA2019: The 5th International Symposium on Microwave/Terahertz Science and ApplicationsSept. 30-Oct. 3, 2019.　2019/09/30
Terahertz plasmonic graphene-channel transistor laser International-presentation

Y. Fuse, A. A. Dubinov, T. Watanabe, V. Ya. Aleshkin, S. V. Morozov, A. Satou, V. Ryzhii, and T. Otsuji

MTSA2019: The 5th International Symposium on Microwave/Terahertz Science and ApplicationsSept. 30-Oct. 3, 2019.　2019/09/30
光励起多層グラフェンにおける広帯域テラヘルツ光放射の観測

込山貴大, 渡辺隆之, Sergey Morozov, Mikhail Fadeev, Vladimir Utochkin, 吹留博一, 佐藤昭, 尾辻泰一

テラヘルツ応用システム時限研究専門委員会(THz)共催電子デバイス研究会　2019/12/23
Terahertz Electromagnetic Emission in an Asymmetric Dual-Grating-Gate InGaAs Hight-Electron-Mobility Transistor Stimulated by Plasmonic Instability International-presentation

T. Watanabe, T. Hosotani, A. Satou, and T. Otsuji

URSI-JRSM 2019: 2019 URSI-Japan Radio Science Meeting　2019/09/06
Terahertz emission from an asymmetric dual-grating-gate InGaAs high-electron-mobility transistor stimulated by plasmonic boom instability International-presentation

T. Hosotani, T. Watanabe, A. Satou, and T. Otsuji

IRMMW-THz 2019: 44th International Conference on Infrared, Millimeter, and Terahertz Waves　2019/09/05
Graphene-based van der Waals heterostructures towards a new type of terahertz quantum-cascade lasers International-presentation Invited

T. Watanabe\\, D. Yadav\\, S. Boubanga-Tombet\\, A. Satou\\, A.A. Dubinov\\, V. Ryzhii\\, T. Otsuji

SPIE OPTICS+ Phootnics
Current-driven plasmonic instability in graphene metasurfaces for terahertz applications International-presentation Invited

S. Boubanga-Tombet, D. Yadav, A. Satou, W. Knap, V.V. Popov, T. Otsuji

META2019: the 10th International Conference on Metamaterials, Photonic Crystals and Plasmonics
Current-driven plasmonic instability in graphene metasurfaces for terahertz applications International-presentation Invited

S. Boubanga-Tombet, D. Yadav, A. Satou, W. Knap, V.V. Popov, T. Otsuji

AES2019: the 7th Advanced Electromagnetics Symposium
Terahertz photoluminescence from narrow gap HgTe/CdHgTe heterostructures and multilayer graphene International-presentation

V.V. Utochkin, S.V. Morozov, M.A. Fadeev, V.V. Rumyantsev, N.N. Mikhailov, S.A. Dvoretsky, T. Komiyama, T. Watanabe, H. Fukidome, A. Satou, T. Otsuji

RJUSE2019: 8th Russia-Japan-USA-Europe Symposium on Fundamental & Applied Problems of Terahertz Devices & Technologies & GDR-I FIR-LAB Workshop　2019/07/09
Terahertz light amplification stimulated by current-driven plasmon instability in graphene-channel transistors International-presentation Invited

S. Boubanga-Tombet\\, W. Knap\\, A. Satou\\, D. But\\, V.V. Popov\\, and T. Otsuji

GSMM: the 12th Global Symposium on Millimeter Waves
Terahertz light amplification of stimulated emission of radiation in current-injection graphene channel transistor International-presentation Invited

S. Boubanga-Tombet\\, D. Yadav\\, T. Watanabe\\, A. Satou\\, W. Knap\\, V.V. Popov\\, V. Ryzhii\\, and T. Otsuji

SPIE Defence+Commercial Sensing
Terahertz light amplification stimulated by current-driven plasmon instability in grating-gate graphene transistor structures International-presentation Invited

S. Boubanga-Tombet\\, W. Knap\\, D. Yadav\\, A. Satou\\, D. but\\, V.V. Popov\\, and T. Otsuji

FGTC: French-German Terahertz Conference 2019
横型グラフェントンネルダイオードにおけるゲート電界効果の解析

志賀佳菜子, 菅原健太, 佐藤昭, 吹留博一, 尾辻泰一, 内野俊

第66回応用物理学会春季学術講演会　2019/03/10
Fabrication of Gate Tunable Graphene Lateral Tunnel Diodes International-presentation

T. Uchino, K. Shiga, K. Sugawara, H. Fukidome, A. Satou, and T. Otsuji

2018 MRS Fall Meeting　2018/11/27
Terahertz current-driven plasmonic lasing and amplification International-presentation Invited

D. Yadav, S. Boubanga-Tombet, G. Tamamushi, T. Watanabe, A. Satou, A. Dubinov, M. Ryzhii, V. Ryzhii, and T. Otsuji

WINDS 18: International Workshop on Innovative Nanoscale Devices and Systems　2018/11/28
Graphene-based 2D heterostructures for terahertz photonic and plasmonic light-sources applications International-presentation Invited

D. Yadav, T. Watanabe, S. Boubanga-Tombet, A. Satou, V. Ryzhii, M. Ryzhii, A.A. Dubinov, W. Knap, V.V. Popov, T. Otsuji

ICMNE-2018: International Conference on Nano- and Micro-Electronics　2018/10/03
ALD-Al2O3を用いた横型グラフェントンネルダイオードの作製

志賀佳菜子, 菅原健太, 佐藤昭, 吹留博一, 尾辻泰一, 内野俊

第79回応用物理学会秋季学術講演会　2018/09/19
Emission and amplification of terahertz radiation using Dirac fermions and plasmons in graphene International-presentation Invited

T. Otsuji, D. Yadav, S. Boubanta-Tombet, T. Watanabe, A. Satou, A.A. Dubinov, M. Ryzhii, V.V. Popov, W. Knap, V. Mitin, M.S. Shur, and V. Ryzhii

RJUSE: the 7th Russia-Japan-USA-Europe Symposium on Fundamental & Applied Problems of Terahertz Devices & Technologies　2018/09/19
Auger Recombination in Graphene with Spectral Broadening and Renormalization by Electron-Electron Interaction International-presentation

A. Satou, V. Ryzhii, V. Vyurkov, G. Alymov, and D. Svintsov

PIERS: Progress in Electromagnetics Research Symposium　2018/08/04
Terahertz light emission and lasing in current-injection graphene-channel transistors International-presentation Invited

D. Yadav, T. Watanabe, A. Satou, M. Ryzhii, V. Ryzhii, and T. Otsuji

Graphene & Semiconductors | Diamond, Graphite & Carbon Materials　2018/04/16
Terahertz light emission and lasing in graphene-based van der Waals 2D heterostructures International-presentation Invited

D. Yadav, T. Watanabe, S. boubanga-Tombet, A. Satou, V. Ryzhii, and T. Otsuji

WINDS17: 2017 International Workshop on Innovative Nanoscale Devices and Systems　2017/11/27
High-speed pulse response of asymmetric-dual-grating-gate plasmonic THz detector International-presentation

T. Hosotani, F. Kasuya, M. Suzuki, T. Suemitsu, T. Otsuji, Y. Takida, H. Ito, H. Minamide, T. Ishibashi, M. Shimizu, and A. Satou

ISPOC 2017: International Symposium on Photonics and Optical Communications 2017　2017/10/25
Terahertz light emission and lasing in graphene transistors under current-injection pumping International-presentation

T. Otsuji, D. Yadav, T. Watanabe, S. Boubanga-Tombet, A. Satou, T. Suemitsu, V. Ryzhii, A.A. Dubinov, M. Ryzhii, V. Mitin, and M.S. Shur

RJUSE TeraTech 2017: Russia-Japan-USA-Europe Symposium on Fundamental & Applied Problems of Terahertz Devices & Technologies　2017/10/02
Terahertz light emission in graphene-based active plasmonic metamaterial heterostructures International-presentation Invited

T. Otsuji, T. Watanabe, A. Satou, D. Yadav, S. Boubanga-Tombet, T. Suemitsu, and V. Ryzhii

META'17: the 8th International Conference on Metamaterials, Photonic Crystals and Plasmonics　2017/07/25
Current-injection terahertz lasing in graphene-channel field effect transistors International-presentation Invited

G. Tamamushi, T. Watanabe, A. Dubinov, T. Suemitsu, A. Satou, M. Ryzhii, V. Ryzhii, T. Otsuji

WINDS16: 2016 International Workshop on Innovative Nanoscale Devices and Systems　2016/12/04
Numerical characterization of Dyakonov-Shur instability in gated two-dimensional electron systems International-presentation

A. Satou, K. Narahara

RJUSE: 5th Russia-Japan-USA-Europe Symposium on Fundamental & Applied Problems of Terahertz Devices & Technologies　2016/11/01
Current injection terahertz lasing in graphene-channel field-effect transistors under population inversion International-presentation Invited

T. Watanabe, G. Tamamushi, A. A. Dubinov, A. Satou, M. Ryzhii, V. Ryzhii, T. Otsuji

ICMNE: Int. Conf. on Micro- and Nano-Electronics　2016/10/03
5.2-THz single-mode lasing in current injection distributed-feedback dual-gate graphene-channel field-effect transistor International-presentation

G. Tamamushi, T. Watanabe, A. Dubinov, H. Wako, A. Satou, T. Suemitsu, M. Ryzhii, V. Ryzhii, T. Otsuji

IRMMW-THz: 41st International Conference on Infrared, Millimeter and Terahertz Waves　2016/09/25
Terahertz emission and detection in graphene-based heterostructures International-presentation Invited

S. Boubanga Tombet, D. Yadav, G. Tamamushi, T. Watanabe, A. A. Dubinov, A. Satou, T. Suemitsu, M. Ryzhii, V. Ryzhii, T. Otsuji

Global Graphene Forum 2016　2016/08/23
Graphene-based van der Waals heterostuctrue plasmonic metamaterials for terahertrz device applications International-presentation Invited

T. Otsuji, D. Svintsov, A. Dubinov, D. Yadav, S. Boubanga Tombet, T. Watanabe, A. Satou, V. Ryzhii, V. Mitin, M.S. Shur

META 2016: 7th International Conference on Metamaterials, Photonic Crystals and Plasmonics　2016/07/25
Observation of spontaneous terahertz emission from optically pumped monolayer intrinsic graphene International-presentation

T. Watanabe, H. Wako, A. Satou, A. A. Dubinov, K. Kawahara, H. Ago, V. Ryzhii, T. Otsuji

CSW: Conpound Semiconductor Week 2016, a joint venue for the 43rd International Symposium on Compound Semiconductors (ISCS) and the 28th International Conference on Indium Phosphide and Related Materials (IPRM)　2016/06/26
Plasmonic terahertz detector based on graphene split-gate FET with nanoconstrictions in lateral p-n junction depletion region International-presentation

V. Ryzhii, M. Ryzhii, A. Satou, T. Otsuji, V. Mitin, M.S. Shur

QSIP 2016: Quantum Structured Photodetector International Conference　2016/06/12
Emission and detection of terahertz radiation in graphene-based van der Waals heterostuctrues International-presentation Invited

T. Otsuji, S. A. Boubanga-Tombet, T. Watanabe, D. Yadav, A. Satou, A. A. Dubinov, D. Svintsov, M. Ryzhii, V. Mitin, M.S. Shur, V. Ryzhii

EMN Meeting on Terahertz　2016/05/14
Observation of amplified spontaneous terahertz emission from optically pumped monolayer intrinsic graphene International-presentation

H. Wako, T. Watanabe, A. Satou, K. Kawahara, H. Ago, V. Ryzhii, T. Otsuji

The 2nd International Symposium on Frontiers in Terahertz Technology　2015/08/30
Emission and detection of terahertz radiation using two-dimensional plasmonic metamaterials International-presentation Invited

T. Otsuji, A. Satou, S.A. Boubanga Tombet, V. Ryzhii, V.V. Popov, V. Mitin, M.S. Shur

The 6th International Conference on Metamaterials, Photonic Crystals and Plasmonics　2015/08/04
Plasmonic terahertz emitters and detectors for sensing and wireless communications International-presentation Invited

T. Otsuji, A. Satou, S. Boubanga-Tombet, T. Watanabe, G. Ducournau, Y.M. Meziani, W. Knap, V.V. Popov

The 36th Progress in Electromagnetics Resarch Symposium　2015/07/06
Terahertz wave generation using graphene and III-V semiconductor heterostructures International-presentation Invited

T. Otsuji, S. Boubanga-Tombet, A. Satou, T. Watanabe, V. Ryzhii, M. Ryzhii, V. V. Popov, A. A. Dubinov, V. Mitin, M. Shur

RJUS TeraTech-2015: The 4th Russia-Japan-USA Symposium: The Fundamental & Applied Problems of Terahertz Devices & Technologies　2015/06/09
Graphene active plasmionics for terahertz device applications International-presentation Invited

T. Otsuji, A. Dubinov, M. Ryzhii, S. Boubanga Tombet, A. Satou, V. Mitin, M.S. Shur, V. Ryzhii

SPIE Defense + Security, and Sensing Technology + Applications　2015/04/20
THz detection using a dual-grating-gate plasmonic detector International-presentation

S. Boubanga Tombet, A. Satou, V. V. Popov, T. Otsuji

TeraNano V: 5th International Symposium on Terahertz Nanoscience　2014/12/01
Detection of terahertz and mid-infrared radiations by InP-based asymmetric dual-grating-gate HEMTs International-presentation

D. Coquillat, P. Zagrajek, N. Dyakonova, K. Chrzanowski, J. Marczewski, Y. Kurita, A. Satou, K. Kobayashi, S. Boubanga Tombet, V. Popov, T. Suemitsu, T. Otsuji, W. Knap

IRMMW-THz 2014: 39th International Conference on Infrared, Millimeter, and Terahertz Waves　2014/09/15
Terahertz population inversion in optically pumped graphene: dependence on pumping photon energy International-presentation

A. Satou, Y. Kurita, V. Ryzhii, T. Otsuji

JSAP-MRS Joint Symposia: Symposium C　2013/09/16
Graphene nanoribbon field-effect transistor: device model and characteristics International-presentation

A. Satou, V. Ryzhii, M. Ryzhii, T. Otsuji

NMDC 2008 (The IEEE Nanotechnology Materials and Devices Conference)　2008/10/20

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Industrial Property Rights 2

周波数下方変換措置、及び通信装置

尾辻泰一, 佐藤昭

特許7440988

Property Type: Patent
フォトダイオード、光波検出器、周波数下方変換装置、及び通信装置

佐藤昭, 尾辻泰一

Property Type: Patent

Research Projects 21

非対称線形分散2Dヘテロによるゼロ消費電力THz検出器の創製

唐超, 林宗澤, 佐藤昭, 易利

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(B)

Institution: 東北大学

2025/04/01 - 2028/03/31
Creation of Photonically-Driven High-Electron-Mobility Transistor Amplifiers

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Research (Exploratory)

Institution: Tohoku University

2024/06/28 - 2026/03/31
Controlling the parity and time-reversal symmetry of graphene Dirac plasmons and its application to terahertz lasers

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2021/04 - 2026/03
半導体二次元プラズモンの三次元整流効果とその超高感度テラヘルツ電磁波検出への応用

佐藤昭, 尾辻泰一

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(B)

Institution: 東北大学

2021/04/01 - 2025/03/31

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回折格子ゲート構造プラズモニックTHzディテクタにおける三次元整流効果の解明を目的として、第一年次であるR03年度は以下の研究項目を遂行した： ①InGaAsチャネル三次元型プラズモニックTHzディテクタ第一に、アクティブ領域を20×20μm2から200×200μm2まで拡大させてデバイスを試作し、THzパルス検出測定を行なった結果、出力光起電圧を一桁程度増大させることに成功した。第二に、出力光起電圧パルス波形に現れる100ナノ秒オーダーのテール成分が、InGaAsチャネル層－ゲート電極間のInAlAsキャリア供給層に存在するドナー準位に起因することを突き止め、キャリア供給層をチャネル層－ゲート電極の外側に配置する逆HEMT構造を採用することにより、テール成分を除去することに成功した。第三に、逆HEMT構造をベースとして、バリア層材料InAlAsからInPに変更した構造をバンド構造シミュレーションによって設計し、ヘテロエピ基板の試作を進めた。第四に、流体力学方程式とマクスウェル方程式を組み合わせたデバイスシミュレータを構築し、同プラズモニックTHzディテクタにおけるプラズモン・ポラリトン励起と非線形整流効果の理論解析を可能にする研究基盤を形成した。 ②グラフェンチャネル三次元型プラズモニックTHzディテクタ第一に、SiNゲート絶縁膜を持つ二重回折格子ゲート構造グラフェンチャネルFETを試作してTHzパルス検出測定を行ない、ゲート電極から出力読み出しが可能であることを実験的に示した。第二に、同ディテクタにおいてはプラズモン流体非線形性整流効果による光起電圧の生成と同時に、光熱電効果によっても光起電圧が生成され、それらの時間応答が10ピコ秒オーダーと非常に速いことを実験的に示した。
半導体二次元プラズモンの三次元整流効果とその超高感度テラヘルツ電磁波検出への応用

佐藤昭

Offer Organization: 日本学術振興会

System: 科学研究費助成事業基盤研究(B)

Category: 基盤研究(B)

Institution: 東北大学

2021/04 - 2025/03

More details Close

回折格子ゲート構造プラズモニックTHzディテクタにおける三次元整流効果の解明を目的として、第一年次であるR03年度は以下の研究項目を遂行した： ①InGaAsチャネル三次元型プラズモニックTHzディテクタ第一に、アクティブ領域を20×20μm2から200×200μm2まで拡大させてデバイスを試作し、THzパルス検出測定を行なった結果、出力光起電圧を一桁程度増大させることに成功した。第二に、出力光起電圧パルス波形に現れる100ナノ秒オーダーのテール成分が、InGaAsチャネル層－ゲート電極間のInAlAsキャリア供給層に存在するドナー準位に起因することを突き止め、キャリア供給層をチャネル層－ゲート電極の外側に配置する逆HEMT構造を採用することにより、テール成分を除去することに成功した。第三に、逆HEMT構造をベースとして、バリア層材料InAlAsからInPに変更した構造をバンド構造シミュレーションによって設計し、ヘテロエピ基板の試作を進めた。第四に、流体力学方程式とマクスウェル方程式を組み合わせたデバイスシミュレータを構築し、同プラズモニックTHzディテクタにおけるプラズモン・ポラリトン励起と非線形整流効果の理論解析を可能にする研究基盤を形成した。 ②グラフェンチャネル三次元型プラズモニックTHzディテクタ第一に、SiNゲート絶縁膜を持つ二重回折格子ゲート構造グラフェンチャネルFETを試作してTHzパルス検出測定を行ない、ゲート電極から出力読み出しが可能であることを実験的に示した。第二に、同ディテクタにおいてはプラズモン流体非線形性整流効果による光起電圧の生成と同時に、光熱電効果によっても光起電圧が生成され、それらの時間応答が10ピコ秒オーダーと非常に速いことを実験的に示した。
小型・低消費電力・低雑音THzトランシーバを実現する光電子融合ヘテロジニアス集積技術の研究開発

Offer Organization: 総務省

System: 戦略的情報通信研究開発推進事業

2023/07 - 2024/03
Extraordinary plasmon instabilities in graphene Dirac Fermions and their terahertz functional device applications

OTSUJI Taiichi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Research (Pioneering)

Institution: Tohoku University

2020/04/01 - 2022/03/31

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In this study, we have developed a model theory based on our original hypothesis for the "anomalous instability of graphene plasmon," which cannot be explained by conventional theories, as if it transcends the physical property limit of graphene, and clarified the theory by building a prototype device with an original structure and experimentally verifying the device. Furthermore, we have successfully demonstrated terahertz amplification and coherent oscillation devices that can be operated at room temperature, which have been difficult to realize in both conventional electronic and photonic devices, by introducing graphene plasmon anomalous instability.
Beyond 5G超高速・超大容量無線通信システムのためのヘテロジニアス光電子融合技術の研究開発

Offer Organization: NICT

System: Beyond 5G 研究開発促進事業

2021/10 - 2022/03
Extraordinary plasmon instabilities in graphene Dirac Fermions and their terahertz functional device applications

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Challenging Research (Pioneering)

Category: Challenging Research (Pioneering)

Institution: Tohoku University

2018/06 - 2022/03
Plasmonic THz Detector with 2D Periodic Diffraction Structure

Satou Akira

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

Category: Grant-in-Aid for Scientific Research (C)

Institution: Tohoku University

2018/04 - 2021/03

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We proposed a novel plasmonic THz detector, based on an InGaAs-channel HEMT, with a two-dimensional diffraction-grating structure (metallic nano-antennas) and conducted simulations and THz detection measurement for fabricated devices to reveal its THz detection mechanism that utilizes two-dimensional natures of the two-dimensional plasmons. We demonstrated that THz waves with polarization in the channel-width direction can be detected by the two-dimensional natures of the plasmons, which cannot be accomplished by conventional plasmonic THz detectors, and we showed that the polarization characteristic of the detector responsivity can be controlled by the design of the nano-antennas. With this, we created the device design principle of plasmonic THz detectors that utilize plasmonic two-dimensional natures.
５G時代に対応した大容量・低遅延・シームレスな光/ミリ波変換デバイスの開発と実証評価

Offer Organization: NICT

System: 高い環境耐性を有するキャリアコンバータ技術の研究開発

2016/05 - 2021/03
Creation of 2D-Atomically-Thin-Layered Heterojunctions and their Applications to Novel Terahertz Photonic Devices

OTSUJI Taiichi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (S)

Category: Grant-in-Aid for Scientific Research (S)

Institution: Tohoku University

2016/05 - 2021/03

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In this study, we developed two-dimensional atomically-thin van der Waals heterojunction materials of semimetals like graphene, insulators like h-BN and semiconductors like WS2 as a material-system platform, and discovered distinctive physical phenomena in complex quantum systems involving electrons, photons, plasmons, and phonons as a new operating mechanism. By introducing such a mechanism in the developed 2D material systems we created the novel functional devices that can realize the functions of amplification, oscillation, detection, and nonlinear wave control in the terahertz region with high energy efficiency that cannot be achieved by conventional materials and physical mechanisms.
Generation of the semiconductor two-dimensional plasmonic boom and its application to terahertz devices

OTSUJI TAIICHI, TOMBET Stephane, WATANABE Takayuki, SATOU Akira, NARAHARA Koichi, RYZHII Victor, SUEMITSU Tetsuya, SHUR Michael S., AIZIN Gregory R., POPOV Vychaslav V.

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Tohoku University

2016/04 - 2018/03

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We explored the generation of the plasmonic boom, a kind of plasmon instability utilizing the super velocity phenomenon of collective charge density waves of two-dimensional electrons in monolayer graphene and their application to the generation and amplification of terahertz electromagnetic wave radiations. An asymmetric dual-grating-gate structure was introduced into the graphene channel field-effect transistor to spatially and periodically modulate the electron drift velocity and the plasma wave velocity crossing over each other at the periodic boundaries. It is theoretically expected that intense shock waves (plasmonic boom) such as supersonic will occur at the moment the drift velocity exceeds the plasma wave velocity. We designed and fabricated the device and experimentally verified the occrrence of the plasmonic instability driven giant light amplification of stimulated emission of terahertz radiation at room temperature for the first time.
二次元原子薄膜ヘテロ接合の複合量子物性とそのテラヘルツ光電子デバイス応用

尾辻泰一, TOMBET STEPHANE, Maxim・V Ryzhii, 佐藤昭, 渡辺隆之

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(A)

Institution: 東北大学

2016/04/01 - 2017/03/31

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本研究は，バンドギャップレスな半金属的性質を有するグラフェンを中心として，h-BN等の絶縁体やMoS2等の遷移金属ジカルコゲナイド半導体とのvan der Waals接合からなる二次元原子薄膜ヘテロ接合材料をプラットフォームとして，量子効果やプラズモニック効果などの二次元原子薄膜ヘテロ接合系に特徴付けられた電子・フォトン・プラズモン・フォノンが関わる複合量子系に現れる物理現象を動作機構として新たに導入し，テラヘルツ波領域での増幅・発振・検出等の信号処理機能を，従来の材料・物理機構が果たし得なかった極めて高いエネルギー効率で実現し得るデバイスを創出することを目的として策定した。初年度は，(1)当該の基本構造（G－DGL）をプラットフォームとして構築すること，(2)G－DGLの従来型素子に対する性能優位性の明確化，(3)プラズモン＆フォトンアシスト二重共鳴現象の発現とそのテラヘルツ放射能・検出能の向上に挑戦を計画した。しかし，基盤研究（S）に採択されたため，5月末日をもって研究を終了することとなり，課題(1)の途中までの進捗に留まった。なお，今後は，採択された基盤研究（S）の課題としてより大きな枠組みで継続推進しており，一層発展・展開する予定である。
Theoretical Verification of Novel Graphene Terahertz Plasmonic Devices

Satou Akira

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

Category: Grant-in-Aid for Young Scientists (B)

Institution: Tohoku University

2014/04 - 2017/03

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In this study, for the realization of room-temperature operating terahertz plasmonic devices utilizing graphene plasmons, we theoretically verified device operation principles of plasmonic devices such as plasmon instabilities in asymmetric dual-grating-gate graphene transistors, interband population inversion in monolayer graphene, and resonant tunneling in double graphene layer. Especially, in the asymmetric dual-grating-gate graphene transistors, we demonstrated that a giant plasmon instability can take place due to the simultaneous occurrence of the so-called Dyakonov-Shur instability and Ryzhii-Satou-Shur instability.
超高速テラヘルツ無線通信を目指したプラズモニックテラヘルツ波エミッタ・ディテクタの研究

佐藤昭

Offer Organization: 村田学術振興財団

System: 村田学術振興財団研究助成

Institution: 東北大学電気通信研究所

2015/07 - 2016/06
二次元プラズモンを利用した超高速近距離テラヘルツ無線用光源・検出デバイスの開発

佐藤昭, トンベットステファン, 末光哲也

Offer Organization: 総務省

System: 電波有効利用促進型研究開発（先進的電波有効利用型）

Institution: 東北大学電気通信研究所

2015/08 - 2016/03
Graphene terahertz detectors based on plasmons and resonant tunneling

TOMBET STEPHANE, OTSUJI Taiichi, SUEMITSU Tetsuya, SATOU Akira, RYZHII Victor, WATANABE Takayuki, YADAV Deepika, KURITA Yuki, POPOV Vyacheslav

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

Category: Grant-in-Aid for Young Scientists (B)

Institution: Tohoku University

2014/04 - 2016/03

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This study was devoted to develop a novel terahertz detector in which the graphene plasmon and quantum-mechanical resonant tunneling are newly introduced as the operation principles. The device consists of a double-graphene-layer in which a tunnel barrier layer is sandwiched by two monolayer-graphene layers and an external gate control element. The device can exploit the photon-assisted resonant tunneling as well as graphene plasmonic resonances as highly sensitive terahertz detection principles. In order to examine the feasibility of the device operation, test devices were fabricated and their property were experimentally measured, confirming the validity of the proposed device structures and the operation principles.
Creation of graphene terahertz lasers

OTSUJI Taiichi, VICTOR Ryzhii, SUEMITSU Maki, SUEMITSU Tetsuya, SATOU Akira, SANO Eiichi, MAXIM Ryzhii, FUKIDOME Hirokazu, WATANABE Takayuki, BOUBANGA-TOMBET Stephane, TAKABAYASHI Susumu, TAKAKUWA Yuzi, AGO Hiroki, KAWAHARA Kenji, DUBINOV Alexander, POPOV Vyacheslav, SVINTSOV Dmitry, MITIN Vladimir, SHUR Michael

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Specially Promoted Research

Category: Grant-in-Aid for Specially Promoted Research

Institution: Tohoku University

2011 - 2015

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We challenged the creation of graphene-based terahertz (THz) lasers. First, we succeeded in observing the stimulated emission of THz radiation at 300K in the transient response of optically pumped graphene, manifesting the proof of the laser operation principle that we had theoretically discovered. Second, we theoretically discovered a giant THz gain enhancement effect of the surface plasmon polaritons in pumped graphene and experimentally verified it by using our original optical-pump and near-field THz-probe spectroscopy. Third, we designed and fabricated the current injection-type graphene THz laser by using our originally developed graphene-synthesis and process technology, succeeding in single-mode lasing at 5.2 THz at 100K for the first time. Fourth, we built the design theory for graphene THz lasers. Furthermore, we proposed a novel device structure and revealed their extremely high THz gain properties. On the basis of these results obtained the feasibility of THz lasing at room temperature from graphene-based devices was quantitatively manifested.
Theoretical study of terahertz plasmons in graphene and their application to terahertz devices

SATOU Akira

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

Category: Grant-in-Aid for Young Scientists (B)

Institution: Tohoku University

2011 - 2013

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The purpose of this research is to develop a fundamental theory of graphene plasmons for their applications to THz emitters and detectors. To investigate the coupling mechanisms of THz waves and graphene plasmons as well as plasmon instabilities associated with the DC current injection, we developed a simulator based on the Boltzmann equation taking into account the nonlinear carrier transport in graphene. We also investigated the effects of electron scatterings, contacts, and heavily-doped substrates on the graphene plasmons.
テラヘルツ応用のためのトランジスタ構造素子の理論及びコンピュータモデリング

佐藤昭

Offer Organization: 日本学術振興会

System: 科学研究費助成事業特別研究員奨励費

Category: 特別研究員奨励費

Institution: 会津大学

2006 - 2007

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トランジスタ構造素子のチャネル内プラズマ振動を利用したTHz波発生・検出器が注目を集めている。本研究ではこれらの素子の動作原理の解明、素子特性の解析および改善案の提案、新たなTHz波発生・検出器の提案を目的とし、素子のシミュレーションを行う。本年度は昨年度に引き続き、ヘテロ構造二次元電子チャネル横方向ショットキー接合素子について、素子の理論的解析、コンピュータシミュレーションのための素子モデリングおよびシミュレーションプログラムの開発、シミュレーションによる解析を行った。今年度は、シミュレーションプログラムの開発に関しては、無衝突ブラゾフ方程式および境界条件を、二次元電子ガスの位置座標の自由度のうち一つについて積分することで、シミュレーションの速度を大幅に改善し、その結果、シミュレーションのメッシュを細かくとることにより、より精度の高い解析が可能となった。シミュレーションによる解析の結果、ソース/ドレイン電極を有する素子においてプラズマ波が著しく減衰することを発見した。また、数学的解析においても同様の結果が得られた。この減衰は、ソース/ドレイン電極においてオーミック接合を仮定したとき、プラズマ波に寄与する電子が接合に流れ出し、その結果、プラズマ波のエネルギーが消失して起こるということを同定した。

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Teaching Experience 16

電子物性B　東北大学工学部電気情報物理工学科
超高周波デバイス工学　東北大学大学院工学研究科
プログラミング演習A　東北大学工学部電気情報物理工学科
創造工学研修　東北大学工学部電気情報物理工学科
工学セミナー　東北大学工学部電気情報物理工学科
学生実験D　東北大学工学部電気情報物理工学科
学生実験B　東北大学工学部電気情報物理工学科
学生実験A　東北大学工学部電気情報物理工学科
プログラミングC演習　会津大学コンピュータ理工学部
微積分II再履修　会津大学コンピュータ理工学部
アルゴリズムとデータ構造演習　会津大学コンピュータ理工学部
Mechanics　The University of Aizu Junior College Division
プログラミングC++演習　会津大学コンピュータ理工学部
OS論演習　会津大学コンピュータ理工学部
Electromagnetisms　The University of Aizu Junior College Division
Computer Architecture　The University of Aizu, School of Computer Sience and Engineering

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Other 8

５G時代に対応した大容量・低遅延・シームレスな光/ミリ波変換デバイスの開発と実証評価

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ミリ波帯の高周波と光周波数を相互に変換可能なキャリアコンバータ技術の研究開発を行う。本受託研究では、ミリ波帯に対応した高効率Ｅ／Ｏ変調モジュールの開発を行い、シームレスなキャリア周波数の変換を実現する。高い機械振動に対応したミリ波帯ビーム制御技術の開発を行い、高い環境耐性を実現する。これらの技術を用いたキャリアコンバータユニットを開発し、自動車へ実装し、車載適用の実証検証を実施する。また、将来のさらなる大容量化を想定し、高精度 AM モード多重用高精度マルチプレクサ/デマルチプレクサ、光源用波長変換デバイス、光電子融合ミキサの研究開発も並行して実施する。
二次元プラズモンを利用した超高速近距離テラヘルツ無線用光源・検出デバイスの開発

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本研究は、サブTHz～THz帯を利用して100～1000 mの近距離を100 Gbit/s級超高速無線伝送を実現し得る送信・受信デバイス・プロトタイプを開発・実証することを目的とする。周波数可変で室温動作可能なmW級出力のコヒーレント単一波長サブTHz～THz光源、高速データ変調されたサブTHz～THz変調波の高速コヒーレント検波を実用レベルで実証・実現する。
超高速テラヘルツ無線通信を目指したプラズモニックテラヘルツ波エミッタ・ディテクタの研究

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本研究では、二次元(2D)プラズモン共鳴を活用した、非対称二重回折格子ゲート構造を有するTHz波エミッタ・ディテクタにおけるプラズモン不安定性の研究を行なう。２つのプラズモン不安定性の同時発現で期待される強調的非線形相互作用（正帰還）の効果を理論的に解明、実験的に実証し、その発現とデバイス構造・材料パラメータの相関を定量的に明らかにする。
バンド間光励起によるグラフェン内非平衡キャリア

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グラフェンにおける光学フォノンが高いエネルギーを有していることを利用して、近赤外／中赤外光をグラフェンに照射し、遠赤外／THz周波数領域に相当する低いキャリアエネルギーにおいてキャリア反転分布を起こさせ、遠赤外／THz光を放射するレーザーとして活用することが考えられている。このようなデバイスにおいて、低温下での音響フォノン、キャリア再結合／自然放射過程を考慮した際のキャリア分布の解析を行なった。キャリアの運動論的方程式にこれらの過程を組み込み、数値解析的に解くことにより、キャリアの非平衡分布を計算した。この解析により、音響フォノン、再結合／自然放射過程が相互作用によってキャリアのエネルギーがゼロになる付近では反転分布は起こらず、> 5 meV の領域において反転分布が起こることが示された。
二次元電子系におけるプラズマ波のコンタクトによる減衰

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運動論的方程式に基づいてHEMTチャネルの二次元電子ガスにおけるプラズマ波のコンピュータシミュレーションを行ない、そのような系においてプラズマ波が急激に減衰することを発見した。そして減衰定数を計算することにより、この減衰は、電子の速度分布によってプラズマ波がずれ、さらには電子がコンタクトに抜け出てチャネル内のプラズマ波の復元力が弱まることにより起こることを突き止めた。
照射電磁波による二次元プラズモン－ポラリトンの励起

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中央に有限幅のコンタクトを有する二次元電子ガスにおける、電磁波照射によるプラズモン－ポラリトン励起を理論的に解析した。マクスウェル方程式と線形化流体力学方程式を組み合わせることにより積分方程式を導き、フーリエ展開法によりさらに行列方程式に還元して数値計算を行なった。この解析により、電磁波の二次元電子ガスによる吸収（プラズモン－ポラリトン励起）が電磁波の周波数、および遅延パラメーターに大きく依存することを示した。
非理想コンタクトを有する二次元電子チャネル内のプラズマ振動

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二次元電子チャネル内のプラズマ振動の周波数および減衰定数が、有限の電子伝導率を持つスロット型コンタクトによってどのような影響を受けるか、解析的研究を行った。線形流体力学方程式とポアッソン方程式を組み合わせて固有値問題に帰することにより、そのような系でのプラズマ周波数と減衰定数を数値解析によって求め、コンタクトの伝導率の関数として導出した。結果として、コンタクトの伝導率がチャネルのそれと同程度の場合、プラズマ振動はコンタクトに浸み出し、コンタクト中の電子散乱によって大きな減衰を受けることが見出された。
テラヘルツ・フォトミキシング高電子移動度トランジスタ内のプラズマ振動におけるp+基板の影響

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テラヘルツ・フォトミキシングを行う高電子移動度トランジスタ内のプラズマ振動の周波数および減衰定数が、p+基板に存在するホールによってどのように影響を受けるか、解析的研究を行った。

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