Details of the Researcher

PHOTO

Masayuki Fujita
Section
Job title
Professor
Degree

  • Ph.D (Doctor of Engineering) (Yokohama National University)

e-Rad No.
40432364
Profile

Masayuki Fujita -Google Scholar-
https://scholar.google.co.jp/citations?user=LUUSyaAAAAAJ

Optica Fellow
"For pioneering contributions to terahertz integrated photonics based on photonic crystals and silicon microstructures"
https://www.optica.org/en-us/get_involved/awards_and_honors/fellow_members/elected_fellows/2023_fellows/

2025 IEEE Photonics Society Distinguished Lecturer
https://dx.doi.org/10.17023/vn4g-j240
https://www.ieee-jp.org/section/tokyo/chapter/PHO-36/info/1764

YouTube on JST CREST "Development of terahertz integrated technology platform through fusion of resonant tunneling diodes and photonic crystals"
https://youtu.be/lxPOy9Ib4EU

Opening up the terahertz gap for sensors and beyond in Nature Spotlight :Sensors
https://www.nature.com/articles/d42473-025-00329-x

 

Papers 202

  1. Micrometer-scale displacement and thickness sensing using a single terahertz resonant-tunneling diode

    Li Yi, Shota Ito, Chao Tang, Yousuke Nishida, Koji Terumoto, Toshihisa Maeda, Yuta Inose, Masayuki Fujita

    Journal of Applied Physics　2026/05/28

    DOI： 10.1063/5.0331663 　

  2. Resonant Tunneling Diode‐Integrated Terahertz Transceiver Module for Wireless Communications

    Weijie Gao, Nguyen H. Ngo, Daiki Ichikawa, Mingxiang Li, Yuta Inose, Yuki Morita, Hidemasa Yamane, Yoshiharu Yamada, Shuichi Murakami, Yosuke Nishida, Tadao Nagatsuma, Withawat Withayachumnankul, Masayuki Fujita

    Advanced Photonics Research　7　(4)　2026/04/22

    Publisher: Wiley

    DOI： 10.1002/adpr.202500314 　

    ISSN： 2699-9293

    eISSN： 2699-9293

    More details Close

    Terahertz bands are essential for next‐generation wireless communications, offering ultrabroad bandwidth and unprecedented data throughput. However, realizing compact, low‐cost, broadband, and efficient terahertz transceiver modules remains challenging. Conventional modules that rely on metallic hollow‐waveguide or silicon‐lens packaging suffer from signal loss, bulkiness, and fabrication complexity. Here, we propose a compact terahertz wireless transceiver module enabled by a resonant tunneling diode (RTD) integrated with a photonic‐electronic antenna chain. The RTD, grown on an InP substrate, is coupled to a modified Vivaldi antenna functioning as a broadband mode converter to an all‐silicon effective‐medium‐clad dielectric waveguide, which terminates with a rod antenna directly interfaced with a three‐dimensional (3D)‐printed cyclic olefin copolymer elliptical lens. This configuration enables ultrabroadband and highly directive free‐space radiation without additional matching networks or anti‐reflection coatings. Encased in a low‐cost 3D‐printed polylactic acid package, the module attains realized gains of 28–33 dBi for the mode and 30–33 dBi for the mode across 220–330 GHz. As a receiver, the module exhibits a noise voltage density down to , a minimum noise equivalent power of 1.8 , and an average responsivity of 6.8 kV/W in the 300‐GHz band under amplified detection. It supports error‐free transmission (bit error rate (BER) less than ) up to 30 Gbit/s for on–off keying (OOK) modulation and 80 Gbit/s (BER below hard‐decision forward error correction limit) for 16‐QAM modulation over 10 cm and enables real‐time uncompressed high‐definition video streaming over 1 m. As a transmitter, the module is demonstrated to support OOK transmission at 332 GHz, achieving error‐free transmission up to 12 Gbit/s. These results establish a compact, lightweight, and multifunctional terahertz transceiver architecture, highlighting the potential of RTD‐based photonic‐electronic integration for 6G and beyond wireless frontends.

  3. Broadband terahertz half-wave plate based on an all-silicon anisotropic effective medium

    Hidemasa Yamane, Yoshiharu Yamada, Yusuke Kondo, Takuya Ehiro, Masayuki Fujita, Shuichi Murakami

    Optics Express　33　(25)　53279-53279　2025/12/10

    Publisher: Optica Publishing Group

    DOI： 10.1364/oe.580234 　

    eISSN： 1094-4087

    More details Close

    We present an all-silicon anisotropic effective-medium half-wave plate (HWP) that provides broadband, low-loss polarization control in the terahertz (THz) band. A two-dimensional anisotropic effective medium was created by etching elliptical air holes on a rhombic lattice through high-resistivity silicon using standard techniques based on micro-electromechanical systems. Finite element simulations predict a phase difference between orthogonal polarizations of π  ± 0.08 π across 1.2–2.0 THz for a single 200 µm-thick layer. The results of terahertz time-domain spectroscopy are presented to demonstrate this HWP performance. Moreover, they show that stacking two, three, and four identical layers to effective thicknesses of 400, 600, and 800 µm shifted the operating band to 0.6–1.0, 0.4–0.67, and 0.3–0.5 THz, respectively, without degrading the phase response. Experimental spectra agree closely with the theory, showing that arbitrary effective thicknesses—and thus target frequency windows—can be achieved by simply stacking thin, easily processed wafers. Parametric sweeps indicated that performance was preserved under standard photolithography tolerances and lateral misalignments of up to 10% of the lattice period. By combining high transmission, wide bandwidth, and straightforward fabrication, the proposed device offers a scalable route for compact THz-band polarization optics for spectroscopy, imaging, and next-generation (6G) wireless communications.

  4. Terahertz On-Chip Communications With Hybrid Electronic-Photonic Interconnects Invited Peer-reviewed

    Daiki Ichikawa, Weijie Gao, Nguyen H. Ngo, Takahiro Ohara, Michihiko Tanaka, Shuichi Murakami, Yoshiharu Yamada, Hidemasa Yamane, Yosuke Nishida, Masayuki Fujita, Tadao Nagatsuma

    IEEE Transactions on Terahertz Science and Technology　15　(5)　751-761　2025/09

    DOI： 10.1109/TTHZ.2025.3594895 　

  5. Wireless Communications of Resonant Tunneling Diode Transmitter and Receiver at 860 GHz Invited Peer-reviewed

    Nguyen H. Ngo, Feifan Han, Yuta Inose, Masayuki Fujita, Safumi Suzuki

    IEEE Transactions on Terahertz Science and Technology　15　(5)　763-770　2025/09

    DOI： 10.1109/TTHZ.2025.3591922 　

  6. Terahertz Circularly Polarized Antenna Based on 3D-Printed Twist Peer-reviewed

    Weijie Gao, Daiki Ichikawa, Withawat Withayachumnankul, Masayuki Fujita

    2024 IEEE Asia-Pacific Microwave Conference (APMC)　381-383　2024/11/17

    Publisher: IEEE

    DOI： 10.1109/apmc60911.2024.10867739 　

  7. Fusion of Resonant Tunneling Diodes and Terahertz Silicon Photonics for Interconnects Peer-reviewed

    Nguyen H. Ngo, Yuta Inose, Yosuke Nishida, Ratmalgre Koala, Yuji Matsuura, Shuichi Murakami, Yoshiharu Yamada, Hidemasa Yamane, Tadao Nagatsuma, Masayuki Fujita

    2024 IEEE Photonics Conference (IPC)　1-2　2024/11/10

    Publisher: IEEE

    DOI： 10.1109/ipc60965.2024.10799657 　

  8. シリコンY分岐導波路を用いた300 GHz帯三次元イメージング Invited Peer-reviewed

    小藪庸介, 柴田紀彦, 要遼平, 水野遼子, 易利, 冨士田誠之, 永妻忠夫

    107　(10)　306-313　2024/10

    DOI： 10.14923/transelej.2023JCI0020 　

  9. Wireless Data Transmission Using a Resonant Tunneling Diode Transmitter and Receiver at a Frequency Range Exceeding 800 GHz Peer-reviewed

    Feifan Han, Nguyen H. Ngo, Masayuki Fujita, Safumi Suzuki

    2024 49th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)　1-2　2024/09/01

    Publisher: IEEE

    DOI： 10.1109/irmmw-thz60956.2024.10697566 　

  10. Terahertz Slot Waveguide for Taperless Interfacing Peer-reviewed

    Nguyen H. Ngo, Weijie Gao, Mingxiang Li, Withawat Withayachumnankul, Masayuki Fujita

    2024 49th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)　1-2　2024/09/01

    Publisher: IEEE

    DOI： 10.1109/irmmw-thz60956.2024.10697908 　

  11. Resonant Tunneling Diode Transceiver For Integrated Terahertz Band 3D Image Sensor Peer-reviewed

    Li Yi, Yuta Inose, Nguyen H. Ngo, Suyun Wang, Yosuke Nishida, Masayuki Fujita

    2024 49th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)　1-2　2024/09/01

    Publisher: IEEE

    DOI： 10.1109/irmmw-thz60956.2024.10697584 　

  12. Terahertz Silicon Waveguide Interconnections for On-chip Communications Peer-reviewed

    Daiki Ichikawa, Yuma Kawamoto, Takahiro Ohara, Michihiko Tanaka, Weijie Gao, Shuichi Murakami, Yoshiharu Yamada, Hidemasa Yamane, Yosuke Nishida, Masayuki Fujita, Tadao Nagatsuma

    2024 49th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)　1-2　2024/09/01

    Publisher: IEEE

    DOI： 10.1109/irmmw-thz60956.2024.10697832 　

  13. Ultra‐Wideband Terahertz Integrated Polarization Multiplexer Peer-reviewed

    Weijie Gao, Masayuki Fujita, Shuichi Murakami, Tadao Nagatsuma, Christophe Fumeaux, Withawat Withayachumnankul

    Laser & Photonics Reviews　19　(1)　2400270　2024/08/29

    DOI： 10.1002/lpor.202400270 　

  14. Phase-resolved measurement and control of ultrafast dynamics in terahertz electronic oscillators Peer-reviewed

    Takashi Arikawa, Jaeyong Kim, Toshikazu Mukai, Naoki Nishigami, Masayuki Fujita, Tadao Nagatsuma, Koichiro Tanaka

    Nature Communications　15　(1)　2024/07/02

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s41467-024-48782-4 　

    eISSN： 2041-1723

    More details Close

    Abstract As a key component for next-generation wireless communications (6 G and beyond), terahertz (THz) electronic oscillators are being actively developed. Precise and dynamic phase control of ultrafast THz waveforms is essential for high-speed beam steering and high-capacity data transmission. However, measurement and control of such ultrafast dynamic process is beyond the scope of electronics due to the limited bandwidth of the electronic equipment. Here we surpass this limit by applying photonic technology. Using a femtosecond laser, we generate offset-free THz pulses to phase-lock the electronic oscillators based on resonant tunneling diode. This enables us to perform phase-resolved measurement of the emitted THz electric field waveform in time-domain with sub-cycle time resolution. Ultrafast dynamic response such as anti-phase locking behaviour is observed, which is distinct from in-phase stimulated emission observed in laser oscillators. We also show that the dynamics follows the universal synchronization theory for limit cycle oscillators. This provides a basic guideline for dynamic phase control of THz electronic oscillators, enabling many key performance indicators to be achieved in the new era of 6 G and beyond.

  15. Terahertz radar with all-dielectric leaky-wave antenna Peer-reviewed

    Harrison Lees, Daniel Headland, Shuichi Murakami, Masayuki Fujita, Withawat Withayachumnankul

    APL Photonics　2024/03/01

    DOI： 10.1063/5.0180941 　

  16. THz Near-Field Imaging Sensor Using Integrated Substrateless Silicon Interferometer Peer-reviewed

    Shuya Iwamatsu, Daniel Headland, Israa Mohammad, Masayuki Fujita, Andreas Stohr

    2024 15th German Microwave Conference, GeMiC 2024　221-224　2024

    DOI： 10.23919/GeMiC59120.2024.10485296 　

  17. Deflection of electromagnetic waves by pseudogravity in distorted photonic crystals Peer-reviewed

    Kanji Nanjyo, Yuki Kawamoto, Hitoshi Kitagawa, Daniel Headland, Masayuki Fujita, Kyoko Kitamura

    Physical Review A　2023/09/28

    DOI： 10.1103/PhysRevA.108.033522 　

  18. Terahertz integration platforms using substrateless all-silicon microstructures Invited Peer-reviewed

    Daniel Headland, Masayuki Fujita, Guillermo Carpintero, Tadao Nagatsuma, Withawat Withayachumnankul

    APL Photonics　2023/09/01

    DOI： 10.1063/5.0158350 　

  19. Terahertz link with orthogonal polarization over silicon dielectric waveguide Peer-reviewed

    Ratmalgre Koala, Kei Iyoda, Masayuki Fujita, Tadao Nagatsuma

    Electronics Letters　59　(14)　2023/07/24

    Publisher: Institution of Engineering and Technology (IET)

    DOI： 10.1049/ell2.12779 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  20. Multi‐level wireless transmission using resonant tunneling diodes in 300‐GHz band Peer-reviewed

    Julian Webber, Takumi Yamamoto, Naoki Nishigami, Yosuke Nishida, Masayuki Fujita, Tadao Nagatsuma

    Electronics Letters　59　(5)　2023/03/05

    Publisher: Institution of Engineering and Technology (IET)

    DOI： 10.1049/ell2.12731 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  21. Terahertz fiber link using dielectric silicon waveguide interface Peer-reviewed

    Ratmalgre Koala, Kei Iyoda, Weijie Gao, Yuji Matsuura, Masayuki Fujita, Tadao Nagatsuma

    Optics Express　31　(5)　7351-7351　2023/02/14

    Publisher: Optica Publishing Group

    DOI： 10.1364/oe.482785 　

    eISSN： 1094-4087

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    Nascent data-intensive emerging technologies are mandating low-loss, short-range interconnects, whereas existing interconnects suffer from high losses and low aggregate data throughput owing to a lack of efficient interfaces. Here, we report an efficient 22-Gbit/s terahertz fiber link using a tapered silicon interface that serves as a coupler between the dielectric waveguide and hollow core fiber. We investigated the fundamental optical properties of hollow-core fibers by considering fibers with 0.7-mm and 1-mm core diameters. We achieved a coupling efficiency of ∼ 60% with a 3-dB bandwidth of 150 GHz in the 0.3-THz band over a 10 cm fiber.

  22. Mitigating the Timing-Jitter in Terahertz Communications via Nyquist Pulse Shaping Peer-reviewed

    Mohamed Shehata, Ke Wang, Julian Webber, Masayuki Fujita, Tadao Nagatsuma, Withawat Withayachumnankul

    2023 Optical Fiber Communications Conference and Exhibition, OFC 2023 - Proceedings　2023

    DOI： 10.23919/OFC49934.2023.10117317 　

  23. 3D Printed Terahertz Lens Antenna Fed by Effective-Medium-Clad Dielectric Waveguide Peer-reviewed

    Weijie Gao, Withawat Withayachumnankul, Masayuki Fujita, Tadao Nagatsuma

    2023 35th General Assembly and Scientific Symposium of the International Union of Radio Science, URSI GASS 2023　2023

    DOI： 10.23919/URSIGASS57860.2023.10265356 　

  24. Terahertz Integrated Polarization Rotator Based on Effective-Medium-Clad Waveguide Peer-reviewed

    Weijie Gao, Withawat Withayachumnankul, Masayuki Fujita, Tadao Nagatsuma

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

    DOI： 10.1109/IRMMW-THz57677.2023.10299048 　

    ISSN： 2162-2027

    eISSN： 2162-2035

  25. 200 Gbit/s terahertz tunneling demultiplexer in 300 GHz band Peer-reviewed

    Daniel Headland, Withawat Withayachumnankul, Masayuki Fujita, Tadao Nagatsuma, Pascal Szriftgiser, Guillaume Ducournau

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

    DOI： 10.1109/IRMMW-THz57677.2023.10299212 　

    ISSN： 2162-2027

    eISSN： 2162-2035

  26. Integration of Terahertz Resonant Tunneling Diode with Broadband Dielectric Waveguide using Corrugated Mode Converter Peer-reviewed

    Yuma Kawamoto, Koki Kawaguchi, Michihiko Tanaka, Yosuke Nishida, Masayuki Fujita, Tadao Nagatsuma

    Asia-Pacific Microwave Conference Proceedings, APMC　655-657　2023

    DOI： 10.1109/APMC57107.2023.10439679 　

    eISSN： 2690-3946

  27. WR-2.2-Band (330-500 GHz) Packaged Resonant Tunneling Diode Receiver Module for Terahertz Communications Peer-reviewed

    Nguyen H. Ngo, Yuta Inose, Yuma Kawamoto, Yosuke Nishida, Masayuki Fujita, Tadao Nagatsuma

    Asia-Pacific Microwave Conference Proceedings, APMC　399-401　2023

    DOI： 10.1109/APMC57107.2023.10439704 　

    eISSN： 2690-3946

  28. Evaluation of Polymer Dielectric Properties in Terahertz Band using Planar Resonator Peer-reviewed

    Daiki Ichikawa, Masataka Terai, Motoharu Haga, Masayuki Fujita, Tadao Nagatsuma

    Asia-Pacific Microwave Conference Proceedings, APMC　70th　497-499　2023

    DOI： 10.1109/APMC57107.2023.10439722 　

    ISSN： 2436-7613

    eISSN： 2690-3946

  29. 300-GHz-Band Diplexer Module for Frequency-Division Multiplexed Wireless Communications Peer-reviewed

    Yuma Kawamoto, Toki Yoshioka, Norihiko Shibata, Daniel Headland, Masayuki Fujita, Ryo Koma, Ryo Igarashi, Kazutaka Hara, Jun-ichi Kani, Tadao Nagatsuma

    2022 Asia-Pacific Microwave Conference (APMC)　E106.C　(11)　722-726　2022/11/29

    Publisher: IEEE

    DOI： 10.23919/apmc55665.2022.9999783 　

    ISSN： 0916-8524

    eISSN： 1745-1353

  30. Terahertz Oscillator Chips Backside-Coupled to Unclad Microphotonics Peer-reviewed

    Daniel Jonathan Headland, Yosuke Nishida, Xiongbin Yu, Masayuki Fujita, Tadao Nagatsuma

    IEEE Journal of Selected Topics in Quantum Electronics　29　(3: Photon. Elec. Co-Inte. and Ad)　1-10　2022/10/25

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI： 10.1109/jstqe.2022.3215524 　

    ISSN： 1077-260X

    eISSN： 1558-4542

  31. Ultra-Wideband Frequency Modulated Continuous Wave Photonic Radar System for Three-Dimensional Terahertz Synthetic Aperture Radar Imaging Peer-reviewed

    Li Yi, Ryohei Kaname, Ryoko Mizuno, Yihan Li, Masayuki Fujita, Hiroshi Ito, Tadao Nagatsuma

    Journal of Lightwave Technology　40　(20)　6719-6728　2022/10/15

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI： 10.1109/jlt.2022.3193397 　

    ISSN： 0733-8724

    eISSN： 1558-2213

  32. Terahertz topological photonic integrated circuits for 6G and beyond: A Perspective Invited Peer-reviewed

    Abhishek Kumar, Manoj Gupta, Prakash Pitchappa, Nan Wang, Masayuki Fujita, Ranjan Singh

    Journal of Applied Physics　2022/10/14

    DOI： 10.1063/5.0099423 　

  33. WR-1-Band Packaged Low-Loss Unclad Silicon Waveguide Module Peer-reviewed

    Ratmalgre A. S. D. Koala, Shibata Norihiko, Masayuki Fujita, Tadao Nagatsuma

    2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)　2022-August　2022/08/28

    Publisher: IEEE

    DOI： 10.1109/irmmw-thz50927.2022.9895956 　

    ISSN： 2162-2027

    eISSN： 2162-2035

  34. Terahertz Multiplexers Based on Valley Photonic Crystals Peer-reviewed

    Kei Iyoda, Masayuki Fujita, Tadao Nagatsuma

    2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)　2022-August　2022/08/28

    Publisher: IEEE

    DOI： 10.1109/irmmw-thz50927.2022.9895471 　

    ISSN： 2162-2027

    eISSN： 2162-2035

  35. THz Imaging System with a Single Resonant Tunneling Diode Transceiver in 300-GHz Band Peer-reviewed

    Ryoko Mizuno, Ryohei Kaname, Yosuke Nishida, Li Yi, Masayuki Fujita, Tadao Nagatsuma

    2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)　2022-August　2022/08/28

    Publisher: IEEE

    DOI： 10.1109/irmmw-thz50927.2022.9895954 　

    ISSN： 2162-2027

    eISSN： 2162-2035

  36. Output Power Enhancement in Photonic-Based RF Generation by Optical Pulse Compression: Performance Improvement of 300-GHz band 10-Gbit/s ASK system Peer-reviewed

    Keita Toichi, Yuta Uemura, Keita Ogawa, Wataru Tada, Masayuki Suzuki, Hiroyuki Toda, Masayuki Fujita, Tadao Nagatsuma

    Proceedings of the 2022 Conference on Lasers and Electro-Optics Pacific Rim　2022/08/01

    Publisher: Optica Publishing Group

    DOI： 10.1364/cleopr.2022.cmp18a_01 　

  37. Ultra-Low-Loss and Broadband All-Silicon Dielectric Waveguides for WR-1 Band (0.75–1.1 THz) Modules Peer-reviewed

    Ratmalgre Koala, Ryoma Maru, Kei Iyoda, Li Yi, Masayuki Fujita, Tadao Nagatsuma

    Photonics　9　(8)　515-515　2022/07/24

    Publisher: MDPI AG

    DOI： 10.3390/photonics9080515 　

    eISSN： 2304-6732

    More details Close

    This study presents ultra-low-loss and broadband all-silicon dielectric waveguides for the WR-1 band (0.75–1.1 THz). The waveguides are built in high-resistivity silicon (10 kΩ-cm) and integrated with supportive frames fabricated from the same silicon wafer in a single etch process to achieve a compact design. We pursued low-loss, broadband, substrateless, unclad and effective medium waveguides. Smaller propagation losses of 0.3 dB/cm and 0.1 dB/cm were achieved for the unclad and effective medium waveguides, respectively. The 3 dB bandwidth was not encountered in the frequency range of interest and was as broad as 350 GHz. An unclad waveguide was employed to devise a Y-junction to demonstrate its practical applications in terahertz imaging. An integrated circuit card was successfully scanned. In addition, we developed unclad waveguide, effective medium waveguide, and Y-junction modules. The modules incorporated an input/output interface compatible with a standard WR-1 flange (254 μm × 127 μm). Unlike the conventional hollow waveguide modules, the unclad waveguide and effective medium waveguide modules reported total loss improvements of 6 dB and 8 dB, respectively, across the operation band. Our results provided a systematic way of achieving low-loss, compact, and versatile modules in the WR-1 band based on all-dielectric-waveguide platforms.

  38. フォトニクス技術を利用したテラヘルツ無線通信 Peer-reviewed

    永妻 忠夫, 冨士田 誠之, 易 利, ウエバー ジュリアン, 胡間 遼, 五十嵐 稜, 原 一貴, 可児 淳一

    レーザー研究　50　(5)　243-247　2022/05

  39. Silicon Dielectric Diplexer Module for 600-GHz-B and Frequency-Division Multiplexing Wireless Communication Peer-reviewed

    Norihiko Shibata, Yuta Uemura, Yuma Kawamoto, Li Yi, Masayuki Fujita, Tadao Nagatsuma

    IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY　12　(4)　334-344　2022/04/19

    DOI： 10.1109/TTHZ.2022.3167946 　

    ISSN： 2156-342X

    eISSN： 2156-3446

  40. Nanophotonics-inspired all-silicon waveguide platforms for terahertz integrated systems Peer-reviewed

    Ratmalgre A. S. D. Koala, Masayuki Fujita, Tadao Nagatsuma

    NANOPHOTONICS　11　(9)　1741-1759　2022/02/08

    DOI： 10.1515/nanoph-2021-0673 　

    ISSN： 2192-8606

    eISSN： 2192-8614

  41. PAM4 48-Gbit/s wireless communication using a resonant tunneling diode in the 300-GHz band Peer-reviewed

    Atsushi Oshiro, Naoki Nishigami, Takumi Yamamoto, Yosuke Nishida, Julian Webber, Masayuki Fujita, Tadao Nagatsuma

    IEICE ELECTRONICS EXPRESS　19　(2)　2022/01

    DOI： 10.1587/elex.18.20210494 　

    ISSN： 1349-2543

  42. Timing-Jitter Tolerant Nyquist Pulse for Terahertz Communications Peer-reviewed

    Mohamed Shehata, Ke Wang, Julian Webber, Masayuki Fujita, Tadao Nagatsuma, Withawat Withayachumnankul

    JOURNAL OF LIGHTWAVE TECHNOLOGY　40　(2)　557-564　2022/01

    DOI： 10.1109/JLT.2021.3121814 　

    ISSN： 0733-8724

    eISSN： 1558-2213

  43. Broadband terahertz resonant tunnelling diode transmitter integrated with coplanar-waveguide-fed slot-ring antenna Peer-reviewed

    Shuya Iwamatsu, Naoki Nishigami, Yosuke Nishida, Masayuki Fujita, Tadao Nagatsuma

    ELECTRONICS LETTERS　57　(25)　1001-1003　2021/12

    DOI： 10.1049/ell2.12332 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  44. IEEE 802.15.3d-Compliant Waveforms for Terahertz Wireless Communications Peer-reviewed

    Mohamed Shehata, Ke Wang, Julian Webber, Masayuki Fujita, Tadao Nagatsuma, Withawat Withayachumnankul

    JOURNAL OF LIGHTWAVE TECHNOLOGY　39　(24)　7748-7760　2021/12

    DOI： 10.1109/JLT.2021.3113310 　

    ISSN： 0733-8724

    eISSN： 1558-2213

  45. Terahertz Band Communications With Topological Valley Photonic Crystal Waveguide Peer-reviewed

    Julian Webber, Yuichiro Yamagami, Guillaume Ducournau, Pascal Szriftgiser, Kei Iyoda, Masayuki Fujita, Tadao Nagatsuma, Ranjan Singh

    JOURNAL OF LIGHTWAVE TECHNOLOGY　39　(24)　7609-7620　2021/12

    DOI： 10.1109/JLT.2021.3107682 　

    ISSN： 0733-8724

    eISSN： 1558-2213

  46. Towards Practical Terahertz Imaging System With Compact Continuous Wave Transceiver Peer-reviewed

    Li Yi, Yosuke Nishida, Tomoki Sagisaka, Ryohei Kaname, Ryoko Mizuno, Masayuki Fujita, Tadao Nagatsuma

    JOURNAL OF LIGHTWAVE TECHNOLOGY　39　(24)　7850-7861　2021/12

    DOI： 10.1109/JLT.2021.3092779 　

    ISSN： 0733-8724

    eISSN： 1558-2213

  47. Hybrid Integration Between Resonant Tunneling Diodes and Unclad Microphotonic Diplexer for Dual-Channel Coherent Terahertz Receiver Peer-reviewed

    Xiongbin Yu, Daniel Headland, Yosuke Nishida, Ratmalgre Alex Sylvestere Desire Koala, Jaeyoung Kim, Masayuki Fujita, Tadao Nagatsuma

    IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS　28　(3)　1-10　2021/11/25

    DOI： 10.1109/JSTQE.2021.3130813 　

    ISSN： 1077-260X

    eISSN： 1558-4542

  48. Experimental Verification of Output Power Enhancement in Photonic-based 300-GHz Generation by Optical Pulse Compression Peer-reviewed

    Wataru Tada, Masayuki Suzuki, Hiroyuki Toda, Keita Toichi, Yuta Uemura, Norihiko Shibata, Tsubasa Saijo, Masayuki Fujita, Tadao Nagatsuma

    2021 International Topical Meeting on Microwave Photonics (MWP)　2021/11/15

    Publisher: IEEE

    DOI： 10.1109/mwp53341.2021.9639423 　

  49. Steering of beam trajectory by distorted photonic crystals

    Kanji Nanjyo, Hitoshi Kitagawa, Daniel Headland, Masayuki Fujita, Kyoko Kitamura

    2021/10/12

    More details Close

    Electromagnetic waves follow linear paths in homogenous index media, with the exception of band edges. In this study, we introduced spatially distorted photonic crystals (D-PCs) that are capable of beam-steering light waves, even when a homogeneous refractive index is maintained. We analyzed their equifrequency contours to investigate the correspondence between the direction of distortion and the direction of the group velocity vector in the D-PC. Thereafter, we experimentally verified the beam-steering phenomenon in the terahertz range using an all-silicon D-PC. Our structures serve as on-chip beam trajectory control without the need for any specially-engineered materials, using only lattice distortion.

  50. Dielectric slot-coupled half-Maxwell fisheye lens as octave-bandwidth beam expander for terahertz-range applications Peer-reviewed

    Daniel Headland, Andreas Kurt Klein, Masayuki Fujita, Tadao Nagatsuma

    APL PHOTONICS　6　(9)　2021/09

    DOI： 10.1063/5.0054251 　

    ISSN： 2378-0967

  51. 48‐Gbit/s 8K video‐transmission using resonant tunnelling diodes in 300‐GHz band Peer-reviewed

    J. Webber, A. Oshiro, S. Iwamatsu, Y. Nishida, M. Fujita, T. Nagatsuma

    Electronics Letters　57　(17)　668-669　2021/08/15

    Publisher: Institution of Engineering and Technology ({IET})

    DOI： 10.1049/ell2.12219 　

    ISSN： 0013-5194

  52. Gratingless integrated tunneling multiplexer for terahertz waves Peer-reviewed

    Daniel Headland, Withawat Withayachumnankul, Masayuki Fujita, Tadao Nagatsuma

    OPTICA　8　(5)　621-629　2021/05

    DOI： 10.1364/OPTICA.420715 　

    ISSN： 2334-2536

  53. Terahertz coherent oscillator integrated with slot-ring antenna using two resonant tunneling diodes Peer-reviewed

    Shuya Iwamatsu, Yosuke Nishida, Masayuki Fujita, Tadao Nagatsuma

    APPLIED PHYSICS EXPRESS　14　(3)　2021/03

    DOI： 10.35848/1882-0786/abdb8f 　

    ISSN： 1882-0778

    eISSN： 1882-0786

  54. Advanced Terahertz Devices and Systems Toward 6G and beyond Peer-reviewed

    Masayuki Fujita

    Proceedings - 2021 8th NAFOSTED Conference on Information and Computer Science, NICS 2021　348-351　2021

    DOI： 10.1109/NICS54270.2021.9701451 　

  55. Advanced Terahertz Devices Based on Photonic Crystal and Resonant Tunneling Diode Peer-reviewed

    Masayuki Fujita

    2021 IEEE ASIA-PACIFIC MICROWAVE CONFERENCE (APMC)　2021-November　338-338　2021

    DOI： 10.1109/APMC52720.2021.9661852 　

  56. Integrated Terahertz Tunneling Filter Peer-reviewed

    Daniel Headland, Withawat Withayachumnankul, Xiongbin Yu, Masayuki Fujita, Tadao Nagatsuma

    2021 46TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER AND TERAHERTZ WAVES (IRMMW-THZ)　2021-August　2021

    DOI： 10.1109/IRMMW-THz50926.2021.9567646 　

    ISSN： 2162-2027

    eISSN： 2162-2035

  57. Integrated Resonant Tunneling Diode with Rectangular Waveguide I/O using Photonic Crystal Interface Peer-reviewed

    Yuma Kawamoto, Norihiko Shibata, Yuta Uemura, Shuya Iwamatsu, Yosuke Nishida, Masayuki Fujita, Tadao Nagatsuma

    2021 46TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER AND TERAHERTZ WAVES (IRMMW-THZ)　2021-August　2021

    DOI： 10.1109/IRMMW-THz50926.2021.9567393 　

    ISSN： 2162-2027

    eISSN： 2162-2035

  58. Terahertz RTD Chip Backside-coupled to Photonic-crystal Waveguide Peer-reviewed

    Ratmalgre Koala, Daniel Headland, Xiongbin Yu, Yosuke Nishida, Masayuki Fujita, Tadao Nagatsuma

    2021 46TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER AND TERAHERTZ WAVES (IRMMW-THZ)　2021-August　2021

    DOI： 10.1109/IRMMW-THz50926.2021.9567199 　

    ISSN： 2162-2027

    eISSN： 2162-2035

  59. Millimeter-wave and Terahertz Photonics for Communications and Sensors Peer-reviewed

    Tadao Nagatsuma, Masayuki Fujita, Li Yi

    2021 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXPOSITION (OFC)　2021

  60. Enabling Device Technologies for Photonics-assisted Millimeter and Terahertz Wave Applications Peer-reviewed

    Tadao Nagatsuma, Masayuki Fujita, Li Yi

    2021 IEEE INTERNATIONAL ELECTRON DEVICES MEETING (IEDM)　2021-December　11.5.1-11.5.4　2021

    DOI： 10.1109/IEDM19574.2021.9720521 　

    ISSN： 2380-9248

  61. Waveforms with High Spectral Efficiency for Terahertz Communications Peer-reviewed

    Mohamed Shehata, Ke Wang, Julian Webber, Masayuki Fujita, Tadao Nagatsuma, Withawat Withayachumnankul

    2021 46TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER AND TERAHERTZ WAVES (IRMMW-THZ)　2021-August　2021

    DOI： 10.1109/IRMMW-THz50926.2021.9566874 　

    ISSN： 2162-2027

    eISSN： 2162-2035

  62. 600-GHz-Band Frequency-Division Multiplexing Communication with Silicon Unclad Diplexer Peer-reviewed

    Norihiko Shibata, Yuta Uemura, Yuma Kawamoto, Li Yi, Masayuki Fujita, Tadao Nagatsuma

    2021 IEEE ASIA-PACIFIC MICROWAVE CONFERENCE (APMC)　2021-November　139-141　2021

    DOI： 10.1109/APMC52720.2021.9661937 　

  63. 600-GHz-band Silicon Dielectric Waveguide Module Peer-reviewed

    Norihiko Shibata, Yuta Uemura, Yuma Kawamoto, Li Yi, Masayuki Fujita, Tadao Nagatsuma

    2021 46TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER AND TERAHERTZ WAVES (IRMMW-THZ)　2021-August　2021

    DOI： 10.1109/IRMMW-THz50926.2021.9567463 　

    ISSN： 2162-2027

    eISSN： 2162-2035

  64. Characteristics of Effective-Medium-Clad Dielectric Waveguides Peer-reviewed

    Weijie Gao, Wendy S. L. Lee, Xiongbin Yu, Masayuki Fujita, Tadao Nagatsuma, Christophe Fumeaux, Withawat Withayachumnankul

    IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY　11　(1)　28-41　2021/01

    DOI： 10.1109/TTHZ.2020.3023917 　

    ISSN： 2156-342X

    eISSN： 2156-3446

  65. Unclad Microphotonics for Terahertz Waveguides and Systems Peer-reviewed

    Daniel Headland, Withawat Withayachumnankul, Xiongbin Yu, Masayuki Fujita, Tadao Nagatsuma

    JOURNAL OF LIGHTWAVE TECHNOLOGY　38　(24)　6853-6862　2020/12/15

    DOI： 10.1109/JLT.2020.3021681 　

    ISSN： 0733-8724

    eISSN： 1558-2213

  66. Integrated Terahertz Optics with Effective Medium for 600-GHz-band Imaging Peer-reviewed

    Tomoki Sagisaka, Ryohei Kaname, Masato Kikuchi, Naoya Kukutsu, Daniel Headland, Li Yi, Masayuki Fujita, Tadao Nagatsuma

    2020 International Topical Meeting on Microwave Photonics, MWP 2020 - Proceedings　62-65　2020/11/24

  67. Imaging Applications with a Single Resonant Tunneling Diode Transceiver in 300-GHz Band Peer-reviewed

    Li Yi, Ryohei Kaname, Yosuke Nishida, Xiongbin Yu, Masayuki Fujita, Tadao Nagatsuma

    2020 International Topical Meeting on Microwave Photonics, MWP 2020 - Proceedings　120-123　2020/11/24

  68. 50-Gbit/s Terahertz Communication using a Valley Photonic Crystal Waveguide Peer-reviewed

    Julian Webber, Yuichiro Yamagami, Guillaume Ducournau, Pascal Szriftgiser, Masayuki Fujita, Tadao Nagatsuma, Ranjan Singh

    International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz　2020-November　418-419　2020/11/08

    DOI： 10.1109/IRMMW-THz46771.2020.9370972 　

    ISSN： 2162-2027

    eISSN： 2162-2035

  69. Effective-Medium-Cladded Dielectric Waveguides towards Terahertz Integrated Platform Peer-reviewed

    Weijie Gao, Wendy Suk Ling Lee, Xiongbin Yu, Masayuki Fujita, Tadao Nagatsuma, Christophe Fumeaux, Withawat Withayachumnankul

    2020 Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2020 - Proceedings　2020/08

    DOI： 10.1364/CLEOPR.2020.C10B_3 　

  70. Dispersion in broadband terahertz photonic crystal waveguides employing Bragg-mirror suppression Peer-reviewed

    Daniel Headland, Withawat Withayachumnankul, Wendy Suk Ling Lee, Masayuki Fujita, Tadao Nagatsuma

    Proceedings of the 2020 IEEE International Conference on Computational Electromagnetics, ICCEM 2020　23-24　2020/08

    DOI： 10.1109/ICCEM47450.2020.9219519 　

  71. Terahertz Slab-Mode Beam Launchers using Photonic Crystal Waveguides and Integrated Optics Peer-reviewed

    Daniel Headland, Withawat Withayachumnankul, Masayuki Fujita, Tadao Nagatsuma

    2020 Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2020 - Proceedings　2020/08

    DOI： 10.1364/CLEOPR.2020.C12B_2 　

  72. Pulse Shaping for IEEE 802.15.3d Standard Compliant Terahertz Communications Peer-reviewed

    Mohamed Shehata, Ke Wang, Julian Webber, Fujita Masayuki, Tadao Nagatsuma, Withawat Withayachumnankul

    2020 3rd International Workshop on Mobile Terahertz Systems, IWMTS 2020　2020/07

    DOI： 10.1109/IWMTS49292.2020.9166430 　

  73. Terahertz topological photonics for on-chip communication Peer-reviewed

    Yihao Yang, Yuichiro Yamagami, Xiongbin Yu, Prakash Pitchappa, Julian Webber, Baile Zhang, Masayuki Fujita, Tadao Nagatsuma, Ranjan Singh

    NATURE PHOTONICS　14　(7)　446-+　2020/07/01

    DOI： 10.1038/s41566-020-0618-9 　

    ISSN： 1749-4885

    eISSN： 1749-4893

  74. Quantitative evaluation of enhanced Er luminescence in GaAs-based two-dimensional photonic crystal nanocavities Peer-reviewed

    M. Ogawa, J. Tatebayashi, N. Fujioka, R. Higashi, M. Fujita, S. Noda, D. Timmerman, S. Ichikawa, Y. Fujiwara

    Applied Physics Letters　116　(18)　2020/05/04

    DOI： 10.1063/1.5142778 　

    ISSN： 0003-6951

  75. Waveguide-input resonant tunnelling diode mixer for THz communications Peer-reviewed

    X. Yu, T. Ohira, J. Y. Kim, M. Fujita, T. Nagatsuma

    Electronics Letters　56　(7)　342-344　2020/03/30

    DOI： 10.1049/el.2019.3682 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  76. Bragg-Mirror Suppression for Enhanced Bandwidth in Terahertz Photonic Crystal Waveguides Peer-reviewed

    Masayuki Fujita

    IEEE Journal of Selected Topics in Quantum Electronics　26　(2)　2020/03

    DOI： 10.1109/jstqe.2019.2932025 　

    ISSN： 1558-4542

    eISSN： 1558-4542

  77. Bragg-Mirror Suppression for Enhanced Bandwidth in Terahertz Photonic Crystal Waveguides Peer-reviewed

    Daniel Headland, Masayuki Fujita, Tadao Nagatsuma

    IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS　26　(2)　1-9　2020/03

    DOI： 10.1109/JSTQE.2019.2932025 　

    ISSN： 1077-260X

    eISSN： 1558-4542

  78. Half-Maxwell fisheye lens with photonic crystal waveguide for the integration of terahertz optics International-journal Peer-reviewed

    Daniel Headland, Masayuki Fujita, Tadao Nagatsuma

    OPTICS EXPRESS　28　(2)　2366-2380　2020/01/20

    DOI： 10.1364/OE.381809 　

    ISSN： 1094-4087

    eISSN： 1094-4087

  79. Unclad Microphotonic Waveguide Bend Peer-reviewed

    Daniel Headland, Withawat Withayachumnankul, Masayuki Fujita, Tadao Nagatsuma

    2020 45TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ)　2020-November　416-417　2020

    DOI： 10.1109/IRMMW-THZ46771.2020.9370857 　

    ISSN： 2162-2027

    eISSN： 2162-2035

  80. Communications with Terahertz Slab-Mode Beam Peer-reviewed

    Daniel Headland, Naoki Nishigami, Masayuki Fujita, Tadao Nagatsuma

    2020 45TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ)　2020-November　397-398　2020

    DOI： 10.1109/IRMMW-THZ46771.2020.9370571 　

    ISSN： 2162-2027

    eISSN： 2162-2035

  81. Packaged Dish Antenna for Wireless Terahertz Photonic Crystal Waveguide Devices Peer-reviewed

    Daniel Headland, Xiongbin Yu, Masaya Nagai, Masayuki Fujita, Tadao Nagatsuma

    2020 INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION (ISAP)　15-16　2020

    DOI： 10.23919/ISAP47053.2021.9391264 　

  82. Resonant Tunneling Diode Array Oscillator Integrated with Slot-ring Antenna for Terahertz Wireless Communications Peer-reviewed

    Shuya Iwamatsu, Naoki Nishigami, Yousuke Nishida, Masayuki Fujita, Tadao Nagatsuma

    2020 45TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ)　2020-November　422-423　2020

    DOI： 10.1109/IRMMW-THZ46771.2020.9370452 　

    ISSN： 2162-2027

    eISSN： 2162-2035

  83. Broadband Terahertz Dielectric Rod Antenna Array with Integrated Half-Maxwell Fisheye Lens Peer-reviewed

    Ratmalgre Alex Sylvestere Desire Koala, Daniel Headland, Yuichiro Yamagami, Fujita Masayuki, Tadao Nagatsuma

    2020 INTERNATIONAL TOPICAL MEETING ON MICROWAVE PHOTONICS (MWP 2020)　54-57　2020

  84. Effective-medium-cladded dielectric waveguides for terahertz waves International-journal Peer-reviewed

    Weijie Gao, Xiongbin Yu, Masayuki Fujita, Tadao Nagatsuma, Christophe Fumeaux, Withawat Withayachumnankul

    OPTICS EXPRESS　27　(26)　38721-38734　2019/12

    DOI： 10.1364/OE.382181 　

    ISSN： 1094-4087

    eISSN： 1094-4087

  85. Terahertz coherent receiver using a single resonant tunnelling diode International-journal Peer-reviewed

    Yousuke Nishida, Naoki Nishigami, Sebastian Diebold, Jaeyoung Kim, Masayuki Fujita, Tadao Nagatsuma

    SCIENTIFIC REPORTS　9　(1)　18125-18125　2019/12/01

    DOI： 10.1038/s41598-019-54627-8 　

    ISSN： 2045-2322

    eISSN： 2045-2322

  86. Erratum: Simultaneous low-loss and low-dispersion in a photonic-crystal waveguide for terahertz communications (Applied Physics Express (2019) 12 (012005) DOI: 10.7567/1882-0786/aaf4b3) Peer-reviewed

    Xiongbin Yu, Masaki Sugeta, Yuichiro Yamagami, Masayuki Fujita, Tadao Nagatsuma

    Applied Physics Express　12　(11)　2019/11/01

    DOI： 10.7567/1882-0786/ab4c26 　

    ISSN： 1882-0778

    eISSN： 1882-0786

  87. Simultaneous low-loss and low-dispersion in a photonic-crystal waveguide for terahertz communications (vol 12, 012005, 2019) Peer-reviewed

    Xiongbin Yu, Masaki Sugeta, Yuichiro Yamagami, Masayuki Fujita, Tadao Nagatsuma

    APPLIED PHYSICS EXPRESS　12　(11)　2019/11

    DOI： 10.7567/1882-0786/ab4c26 　

    ISSN： 1882-0778

    eISSN： 1882-0786

  88. Efficient mode converter to deep-subwavelength region with photonic-crystal waveguide platform for terahertz applications International-journal Peer-reviewed

    Xiongbin Yu, Jae-Young Kim, Masayuki Fujita, Tadao Nagatsuma

    OPTICS EXPRESS　27　(20)　28707-28721　2019/09/30

    DOI： 10.1364/OE.27.028707 　

    ISSN： 1094-4087

    eISSN： 1094-4087

  89. Direct terahertz communications with wireless and fiber links Peer-reviewed

    Xiongbin Yu, Tomoyuki Miyamoto, Katsunori Obata, Yasuo Hosoda, Jae Young Kim, Masayuki Fujita, Tadao Nagatsuma

    International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz　2019-September　2019/09

    DOI： 10.1109/IRMMW-THz.2019.8874535 　

    ISSN： 2162-2027

    eISSN： 2162-2035

  90. Injection Locking of Resonant Tunneling Diode Oscillator Using Coherent Terahertz Pulses Peer-reviewed

    Takashi Arikawa, Jaeyong Kim, Toshikazu Mukai, Naoki Nishigami, Masayuki Fujita, Tadao Nagatsuma, Koichiro Tanaka

    International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz　2019-September　1492-1492　2019/09

    DOI： 10.1109/IRMMW-THz.2019.8873698 　

    ISSN： 2162-2027

    eISSN： 2162-2035

  91. Evolution from Air-Cladded to Effective-Medium-Cladded Dielectric Waveguides Peer-reviewed

    Weijie Gao, Xiongbin Yu, Masayuki Fujita, Tadao Nagatsuma, Christophe Fumeaux, Withawat Withayachumnankul

    International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz　2019-September　2019/09

    DOI： 10.1109/IRMMW-THz.2019.8874323 　

    ISSN： 2162-2027

    eISSN： 2162-2035

  92. Terahertz Information Tag System with Over-100-bit/s Reading Speed Peer-reviewed

    Tadao Nagatsuma, Yusuke Kujime, Masayuki Fujita, Tomoki Sagisaka, Li Yi

    International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz　2019-September　2019/09

    DOI： 10.1109/IRMMW-THz.2019.8873917 　

    ISSN： 2162-2027

    eISSN： 2162-2035

  93. Integrated Luneburg and Maxwell Fisheye Lenses for the Terahertz Range Peer-reviewed

    Daniel Headland, Withawat Withayachumnankul, Masayuki Fujita, Tadao Nagatsuma

    International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz　2019-September　2019/09

    DOI： 10.1109/IRMMW-THz.2019.8874367 　

    ISSN： 2162-2027

    eISSN： 2162-2035

  94. Terahertz wireless communications using resonant tunnelling diodes with radio-over-fibre Peer-reviewed

    J. Webber, N. Nishigami, J. Y. Kim, M. Fujita, T. Nagatsuma

    Electronics Letters　55　(17)　949-951　2019/08/22

    DOI： 10.1049/el.2019.1840 　

    ISSN： 0013-5194

  95. Near-field out-of-plane coupling between terahertz photonic crystal waveguides Peer-reviewed

    Daniel Headland, Xiongbin Yu, Masayuki Fujita, Tadao Nagatsuma

    OPTICA　6　(8)　1002-1011　2019/08

    DOI： 10.1364/OPTICA.6.001002 　

    ISSN： 2334-2536

  96. Polarization Responses of Terahertz Dielectric Rod Antenna Arrays Peer-reviewed

    Withawat Withayachumnankul, Masayuki Fujita, Tadao Nagatsuma

    2019 International Conference on Microwave and Millimeter Wave Technology, ICMMT 2019 - Proceedings　2019/05

    DOI： 10.1109/ICMMT45702.2019.8992313 　

  97. Terahertz wireless communication using resonant tunneling diodes and practical radio-over-fiber technology Peer-reviewed

    Julian Webber, Naoki Nishigami, Xiongbin Yu, Jae Young Kim, Masayuki Fujita, Tadao Nagatsuma

    2019 IEEE International Conference on Communications Workshops, ICC Workshops 2019 - Proceedings　2019/05

    DOI： 10.1109/ICCW.2019.8757176 　

    ISSN： 2166-0069

  98. Terahertz fibre transmission link using resonant tunnelling diodes integrated with photonic-crystal waveguides Peer-reviewed

    Masayuki Fujita

    Electronics Letters　2019/04/04

    DOI： 10.1049/el.2018.7686 　

    ISSN： 1350-911X

  99. Terahertz fibre transmission link using resonant tunnelling diodes integrated with photonic-crystal waveguides Peer-reviewed

    X. Yu, Y. Hosoda, T. Miyamoto, K. Obata, J. Y. Kim, M. Fujita, T. Nagatsuma

    Electronics Letters　55　(7)　398-400　2019/04

    DOI： 10.1049/el.2018.7686 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  100. Near-field vertical coupling between terahertz photonic crystal waveguides Peer-reviewed

    Daniel Headland, Xiongbin Yu, Masayuki Fujita, Tadao Nagatsuma

    2019 URSI Asia-Pacific Radio Science Conference, AP-RASC 2019　2019/03

    DOI： 10.23919/URSIAP-RASC.2019.8738435 　

  101. Resonant tunneling diode receiver for coherent terahertz wireless communication Peer-reviewed

    Naoki Nishigami, Yousuke Nishida, Sebastian Diebold, Jaeyoung Kim, Masayuki Fujita, Tadao Nagatsuma

    Asia-Pacific Microwave Conference Proceedings, APMC　2018-November　726-728　2019/01/16

    DOI： 10.23919/APMC.2018.8617565 　

  102. Highly stable terahertz resonant tunneling diode oscillator coupled to photonic-crystal cavity Peer-reviewed

    Xiongbin Yu, Jae Young Kim, Masayuki Fujita, Tadao Nagatsuma

    Asia-Pacific Microwave Conference Proceedings, APMC　2018-November　114-116　2019/01/16

    DOI： 10.23919/APMC.2018.8617332 　

  103. Photonic Crystal Waveguide Technologies for Terahertz Applications

    Masayuki Fujita

    International Conference on Metamaterials, Photonic Crystals and Plasmonics　626-627　2019

    eISSN： 2429-1390

  104. Simultaneous low-loss and low-dispersion in a photonic-crystal waveguide for terahertz communications Peer-reviewed

    Masayuki Fujita

    Applied Physics Express　2019/01/01

    DOI： 10.7567/1882-0786/aaf4b3 　

    ISSN： 1882-0786

  105. Simultaneous low-loss and low-dispersion in a photonic-crystal waveguide for terahertz communications Peer-reviewed

    Xiongbin Yu, Masaki Sugeta, Yuichiro Yamagami, Masayuki Fujita, Tadao Nagatsuma

    APPLIED PHYSICS EXPRESS　12　(1)　2019/01/01

    DOI： 10.7567/1882-0786/aaf4b3 　

    ISSN： 1882-0778

    eISSN： 1882-0786

  106. Integrated Circuits Using Photonic-Crystal Slab Waveguides and Resonant Tunneling Diodes for Terahertz Communication Peer-reviewed

    Xiongbin Yu, Ryoumei Yamada, Jae Young Kim, Masayuki Fujita, Tadao Nagatsuma

    Progress in Electromagnetics Research Symposium　2018-August　599-605　2018/12/31

    DOI： 10.23919/PIERS.2018.8597616 　

    ISSN： 1559-9450

    eISSN： 1931-7360

  107. Terahertz multi-beam antenna using photonic crystal waveguide and Luneburg lens Peer-reviewed

    Daniel Headland, Withawat Withayachumnankul, Ryoumei Yamada, Masayuki Fujita, Tadao Nagatsuma

    APL PHOTONICS　3　(12)　2018/12/01

    DOI： 10.1063/1.5060631 　

    ISSN： 2378-0967

    eISSN： 2378-0967

  108. Evolution of Rod Antennas for Integrated Terahertz Photonics Peer-reviewed

    Withawat Withayachumnankul, Ryoumei Yamada, Masayuki Fujita, Tadao Nagatsuma

    International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz　2018-September　2018/10/25

    DOI： 10.1109/IRMMW-THz.2018.8509906 　

    ISSN： 2162-2027

    eISSN： 2162-2035

  109. Terahertz Tag Using Photonic-Crystal Slabs Peer-reviewed

    Yusuke Kujime, Masayuki Fujita, Tadao Nagatsuma

    JOURNAL OF LIGHTWAVE TECHNOLOGY　36　(19)　4386-4392　2018/10/01

    DOI： 10.1109/JLT.2018.2825464 　

    ISSN： 0733-8724

    eISSN： 1558-2213

  110. Integrated Silicon Photonic Crystals Toward Terahertz Communications

    Withawat Withayachumnankul, Masayuki Fujita, Tadao Nagatsuma

    ADVANCED OPTICAL MATERIALS　6　(16)　2018/08/20

    DOI： 10.1002/adom.201800401 　

    ISSN： 2195-1071

    eISSN： 2195-1071

  111. External Feedback Effect in Terahertz Resonant Tunneling Diode Oscillators Peer-reviewed

    Luong Duy Manh, Sebastian Diebold, Kousuke Nishio, Yousuke Nishida, Jaeyoung Kim, Toshikazu Mukai, Masayuki Fujita, Tadao Nagatsuma

    IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY　8　(4)　455-464　2018/07

    DOI： 10.1109/TTHZ.2018.2842209 　

    ISSN： 2156-342X

  112. All-dielectric rod antenna array for terahertz communications Peer-reviewed

    Withawat Withayachumnankul, Ryoumei Yamada, Masayuki Fujita, Tadao Nagatsuma

    APL PHOTONICS　3　(5)　2018/05/01

    DOI： 10.1063/1.5023787 　

    ISSN： 2378-0967

    eISSN： 2378-0967

  113. Terahertz wireless communication using resonant tunneling diodes with radio-over-fiber technology Peer-reviewed

    Julian Webber, Xiongbin Yu, Naoki Nishigami, Jae Young Kim, Masayuki Fujita, Tadao Nagatsuma

    Optics InfoBase Conference Papers　Part F125-JSAP 2018　2018

    DOI： 10.1049/el.2019.1840 　

    ISSN： 1350-911X

  114. Large capacity terahertz tag using photonic crystal slabs Peer-reviewed

    Yusuke Kujime, Masayuki Fujita, Tadao Nagatsuma

    MWP 2017 - 2017 International Topical Meeting on Microwave Photonics　2017-December　1-4　2017/12/05

    DOI： 10.1109/MWP.2017.8168705 　

  115. Terahertz systems based on resonant tunneling diodes and photonic crystals Peer-reviewed

    Masayuki Fujita

    30th Annual Conference of the IEEE Photonics Society, IPC 2017　2017-January　547-547　2017/11/20

    DOI： 10.1109/IPCon.2017.8116217 　

    ISSN： 2374-0140

  116. Asymmetrical conductance model to analyze resonant tunneling diode terahertz oscillators Peer-reviewed

    S. Diebold, M. Fujita, T. Nagatsuma

    IEEE MTT-S International Microwave Symposium Digest　1795-1797　2017/10/04

    DOI： 10.1109/MWSYM.2017.8058997 　

    ISSN： 0149-645X

  117. Terahertz Sensor Using Photonic Crystal Cavity and Resonant Tunneling Diodes Peer-reviewed

    Kazuma Okamoto, Kazuisao Tsuruda, Sebastian Diebold, Shintaro Hisatake, Masayuki Fujita, Tadao Nagatsuma

    JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES　38　(9)　1085-1097　2017/09/01

    DOI： 10.1007/s10762-017-0391-0 　

    ISSN： 1866-6892

    eISSN： 1866-6906

  118. All-dielectric integration of dielectric resonator antenna and photonic crystal waveguide International-journal Peer-reviewed

    Withawat Withayachumnankul, Ryoumei Yamada, Christophe Fumeaux, Masayuki Fujita, Tadao Nagatsuma

    OPTICS EXPRESS　25　(13)　14706-14714　2017/06/26

    DOI： 10.1364/OE.25.014706 　

    ISSN： 1094-4087

    eISSN： 1094-4087

  119. Modulation schemes for resonant tunneling diodes to enhance the data-rate of wireless communications Peer-reviewed

    S. Diebold, S. Nakai, S. K. Nishio, J. Y. Kim, K. Tsuruda, T. Mukai, M. Fujita, S. T. Nagatsuma

    International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz　2016-November　2016/11/28

    DOI： 10.1109/IRMMW-THz.2016.7758934 　

    ISSN： 2162-2027

    eISSN： 2162-2035

  120. High-speed error-free wireless data transmission using a terahertz resonant tunnelling diode transmitter and receiver Peer-reviewed

    S. Diebold, K. Nishio, Y. Nishida, J. Y. Kim, K. Tsuruda, T. Mukai, M. Fujita, T. Nagatsuma

    Electronics Letters　52　(24)　1999-2001　2016/11/24

    DOI： 10.1049/el.2016.2941 　

    ISSN： 0013-5194

  121. Terahertz sensing based on photonic crystal cavity and resonant tunneling diode Peer-reviewed

    Kazuisao Tsuruda, Kazuma Okamoto, Sebastian Diebold, Shintaro Hisatake, Masayuki Fujita, Tadao Nagatsuma

    2016 Progress In Electromagnetics Research Symposium, PIERS 2016 - Proceedings　3922-3926　2016/11/03

    DOI： 10.1109/PIERS.2016.7735476 　

  122. Modeling and Simulation of Terahertz Resonant Tunneling Diode-Based Circuits Peer-reviewed

    Sebastian Diebold, Shunsuke Nakai, Kousuke Nishio, Jaeyoung Kim, Kazuisao Tsuruda, Toshikazu Mukai, Masayuki Fujita, Tadao Nagatsuma

    IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY　6　(5)　716-723　2016/09

    DOI： 10.1109/TTHZ.2016.2592180 　

    ISSN： 2156-342X

  123. Photonic-crystal diplexers for terahertz-wave applications International-journal Peer-reviewed

    Masahiro Yata, Masayuki Fujita, Tadao Nagatsuma

    OPTICS EXPRESS　24　(7)　7835-7849　2016/04

    DOI： 10.1364/OE.24.007835 　

    ISSN： 1094-4087

    eISSN： 1094-4087

  124. Packaging of THz circuits using a HDPE lens and an impedance-matched carrier substrate Peer-reviewed

    S. Diebold, S. Nakai, K. Nishio, K. Tsuruda, T. Mukai, M. Fujita, T. Nagatsuma

    Asia-Pacific Microwave Conference Proceedings, APMC　1　2016/02/17

    DOI： 10.1109/APMC.2015.7411752 　

  125. A terahertz monolithic integrated resonant tunneling diode oscillator and mixer circuit Peer-reviewed

    Sebastian Diebold, Kazuisao Tsuruda, Jae Young Kim, Toshikazu Mukai, Masayuki Fujita, Tadao Nagatsuma

    Proceedings of SPIE - The International Society for Optical Engineering　9856　2016

    DOI： 10.1117/12.2225209 　

    ISSN： 0277-786X

    eISSN： 1996-756X

  126. Photonic-crystal slab for terahertz-wave technology platform Peer-reviewed

    Masayuki Fujita

    Proceedings of SPIE - The International Society for Optical Engineering　9757　2016

    DOI： 10.1117/12.2218065 　

    ISSN： 0277-786X

    eISSN： 1996-756X

  127. Photonic crystal technology for terahertz system integration Peer-reviewed

    Masayuki Fujita, Tadao Nagatsuma

    Proceedings of SPIE - The International Society for Optical Engineering　9856　2016

    DOI： 10.1117/12.2225151 　

    ISSN： 0277-786X

    eISSN： 1996-756X

  128. Millimeter-Wave and Terahertz-Wave Applications Enabled by Photonics Peer-reviewed

    Tadao Nagatsuma, Shintaro Hisatake, Masayuki Fujita, Hai Huy Nguyen Pham, Kazuisao Tsuruda, Shigeru Kuwano, Jun Terada

    IEEE JOURNAL OF QUANTUM ELECTRONICS　52　(1)　2016/01

    DOI： 10.1109/JQE.2015.2506992 　

    ISSN： 0018-9197

    eISSN： 1558-1713

  129. Extremely low-loss terahertz waveguide based on silicon photonic-crystal slab International-journal Peer-reviewed

    Kazuisao Tsuruda, Masayuki Fujita, Tadao Nagatsuma

    OPTICS EXPRESS　23　(25)　31977-31990　2015/12/14

    DOI： 10.1364/OE.23.031977 　

    ISSN： 1094-4087

    eISSN： 1094-4087

  130. Terahertz resonant tunneling diode systems for next generation wireless communication Peer-reviewed

    Sebastian Diebold, Kazuisao Tsuruda, Masayuki Fujita, Tadao Nagatsuma, Jaeyoung Kim, Toshikazu Mukai

    IMFEDK 2015 - 2015 International Meeting for Future of Electron Devices, Kansai　30-31　2015/07/14

    DOI： 10.1109/IMFEDK.2015.7158534 　

  131. Terahertz-wave integrated circuits based on photonic crystals Peer-reviewed

    Kazuisao Tsuruda, Masayuki Fujita, Asako Suminokura, Masahiro Yata, Toshikazu Mukai, Tadao Nagatsuma

    Progress in Electromagnetics Research Symposium　2015-January　2254-2259　2015

    ISSN： 1559-9450

    eISSN： 1931-7360

  132. Integration of resonant tunneling diode with Terahertz photonic-crystal waveguide and its application to gigabit terahertz-wave communications Peer-reviewed

    Asako Suminokura, Kazuisao Tsuruda, Toshikazu Mukai, Masayuki Fujita, Tadao Nagatsuma

    2014 International Topical Meeting on Microwave Photonics / the 9th Asia-Pacific Microwave Photonics Conference, MWP/APMP 2014 - Proceedings　419-422　2014/12/19

    DOI： 10.1109/MWP.2014.6994588 　

  133. Diplexer for terahertz-wave integrated circuit using a photonic-crystal slab Peer-reviewed

    Masahiro Yata, Masayuki Fujita, Tadao Nagatsuma

    2014 International Topical Meeting on Microwave Photonics / the 9th Asia-Pacific Microwave Photonics Conference, MWP/APMP 2014 - Proceedings　40-43　2014/12/19

    DOI： 10.1109/MWP.2014.6994484 　

  134. Capture of a terahertz wave in a photonic-crystal slab Peer-reviewed

    Ryoma Kakimi, Masayuki Fujita, Masaya Nagai, Masaaki Ashida, Tadao Nagatsuma

    NATURE PHOTONICS　8　(8)　657-663　2014/08

    DOI： 10.1038/NPHOTON.2014.150 　

    ISSN： 1749-4885

    eISSN： 1749-4893

  135. 16 Gbit/s wireless terahertz transmission at 300-GHz band using a polymeric thin-film antenna receiver with base-bandwidth enhancement circuits Peer-reviewed

    Masami Inoue, Masayuki Hodono, Masatoshi Oka, Yusuke Minamikata, Daiki Tsuji, Masayuki Fujita, Tadao Nagatsuma

    2014 Asia-Pacific Microwave Conference Proceedings, APMC 2014　1076-1078　2014/03/25

  136. Ultra-Broadband Terahertz Receivers Using Polymer Substrate Peer-reviewed

    Masami Inoue, Masayuki Hodono, Shogo Horiguchi, Kazuki Arakawa, Masayuki Fujita, Tadao Nagatsuma

    IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY　4　(2)　225-231　2014/03

    DOI： 10.1109/TTHZ.2013.2296994 　

    ISSN： 2156-342X

  137. Enhancement of broadband optical absorption in photovoltaic devices by band-edge effect of photonic crystals Peer-reviewed

    Yoshinori Tanaka, Yosuke Kawamoto, Masayuki Fujita, Susumu Noda

    Optics Express　21　(17)　20111-20118　2013/08/26

    DOI： 10.1364/OE.21.020111 　

    ISSN： 1094-4087

    eISSN： 1094-4087

  138. Silicon photonics: Nanocavity brightens silicon

    Masayuki Fujita

    Nature Photonics　7　(4)　264-265　2013/04

    DOI： 10.1038/nphoton.2013.65 　

    ISSN： 1749-4885

    eISSN： 1749-4893

  139. Enhancement of optical absorption in solar cells by band-edge effect of photonic crystals. i -Formation of multiple bandedges Peer-reviewed

    Y. Tanaka, Y. Kawamoto, M. Fujita, S. Noda

    Pacific Rim Conference on Lasers and Electro-Optics, CLEO - Technical Digest　2013

    DOI： 10.1109/CLEOPR.2013.6600085 　

  140. Ultra-broadband receivers using polymeric substrate for multiband terahertz communications Peer-reviewed

    Masami Inoue, Masayuki Hodono, Shogo Horiguchi, Kazuki Arakawa, Masayuki Fujita, Tadao Nagatsuma

    2013 International Symposium on Electromagnetic Theory, EMTS 2013 - Proceedings　211-214　2013

    ISSN： 2163-405X

  141. Ultra-broadband tapered slot terahertz antennas on thin polymeric substrate Peer-reviewed

    Masami Inoue, Masayuki Hodono, Shogo Horiguchi, Masayuki Fujita, Tadao Nagatsuma

    ISAP 2013 - Proceedings of the 2013 International Symposium on Antennas and Propagation　1　633-636　2013

  142. Terahertz-wave absorbers using a photonic crystal slab Peer-reviewed

    Ryoma Kakimi, Masayuki Fujita, Masaya Nagai, Masaaki Ashida, Tadao Nagatsuma

    Pacific Rim Conference on Lasers and Electro-Optics, CLEO - Technical Digest　2013

    DOI： 10.1109/CLEOPR.2013.6600255 　

  143. Ultralow-loss photonic-crystal waveguides for gigabit terahertz-wave communications Peer-reviewed

    Kazuisao Tsuruda, Tsukasa Ishigaki, Asako Suminokura, Ryoma Kakimi, Masayuki Fujita, Tadao Nagatsuma

    2013 IEEE International Topical Meeting on Microwave Photonics, MWP 2013　9-12　2013

    DOI： 10.1109/MWP.2013.6724006 　

  144. Terahertz generation by optical rectification in lithium niobate crystal using a shadow mask. International-journal

    Yuri Avestisyan, Caihong Zhang, Iwao Kawayama, Hironaru Murakami, Toshihiro Somekawa, Haik Chosrowjan, Masayuki Fujita, Masayoshi Tonouchi

    Optics express　20　(23)　25752-7　2012/11/05

    DOI： 10.1364/OE.20.025752 　

    More details Close

    A simple approach to generate high energy, frequency and bandwidth tunable multicycle THz pulses by optical rectification (OR) of spatially shaped femtosecond laser pulses in the lithium niobate (LN) crystal is proposed and demonstrated. A one dimensional binary shadow mask is used as a laser beam shaper. By building the mask's image in the bulk LN crystal with various demagnifications, the frequency of THz generation was tuned in the range of 0.3 - 1.2 THz. There exist also an opportunity to tune the bandwidth of THz generation from 20 GHz to approximately 1 THz by changing the optical beam size on the crystal. The energy spectral density of narrowband THz generation is almost independent of the bandwidth and is typically 0.18 μJ/THz for ~1 W pump power at 1 kHz repetition rate.

  145. Enhancement of photocurrent in ultrathin active-layer photodetecting devices with photonic crystals Peer-reviewed

    Hiroaki Shigeta, Masayuki Fujita, Yoshinori Tanaka, Ardavan Oskooi, Hiroyuki Ogawa, Yusuke Tsuda, Susumu Noda

    Applied Physics Letters　101　(16)　2012/10/15

    DOI： 10.1063/1.4759149 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  146. Photocurrent enhancement in ultrathin silicon by the photonic band-edge effect Peer-reviewed

    Masayuki Fujita, Hiroaki Shigeta, Yoshinori Tanaka, Ardavan Oskooi, Hiroyuki Ogawa, Yusuke Tsuda, Susumu Noda

    2012 IEEE Photonics Conference, IPC 2012　124-125　2012

    DOI： 10.1109/IPCon.2012.6358520 　

    ISSN： 2374-0140

  147. Photonic-crystal slab for terahertz-wave integrated circuits Peer-reviewed

    Tsukasa Ishigaki, Masayuki Fujita, Masaya Nagai, Masaaki Ashida, Tadao Nagatsuma

    2012 IEEE Photonics Conference, IPC 2012　774-775　2012

    DOI： 10.1109/IPCon.2012.6358852 　

    ISSN： 2374-0140

  148. Trapping a terahertz wave in a photonic-crystal slab Peer-reviewed

    Ryoma Kakimi, Masayuki Fujita, Masaya Nagai, Masaaki Ashida, Tadao Nagatsuma

    2012 IEEE Photonics Conference, IPC 2012　562-563　2012

    DOI： 10.1109/IPCon.2012.6358744 　

    ISSN： 2374-0140

  149. Green GaInN photonic-crystal light-emitting diodes with small surface recombination effect Peer-reviewed

    Hitoshi Kitagawa, Masayuki Fujita, Toshihide Suto, Takashi Asano, Susumu Noda

    Applied Physics Letters　98　(18)　2011/05/02

    DOI： 10.1063/1.3576927 　

    ISSN： 0003-6951

  150. Reduction in surface recombination and enhancement of light emission in silicon photonic crystals treated by high-pressure water-vapor annealing Peer-reviewed

    Masayuki Fujita, Bernard Gelloz, Nobuyoshi Koshida, Susumu Noda

    Applied Physics Letters　97　(12)　2010/09/20

    DOI： 10.1063/1.3489419 　

    ISSN： 0003-6951

  151. Reflectance measurement of two-dimensional photonic crystal nanocavities with embedded quantum dots Peer-reviewed

    W. C. Stumpf, T. Asano, T. Kojima, M. Fujita, Y. Tanaka, S. Noda

    Physical Review B - Condensed Matter and Materials Physics　82　(7)　2010/08/12

    DOI： 10.1103/PhysRevB.82.075119 　

    ISSN： 1098-0121

    eISSN： 1550-235X

  152. Enhancement of light emission from silicon by a photonic crystal nanocavity and high-pressure water vapor annealing Peer-reviewed

    Masayuki Fujita, Bernard Gelloz, Nobuyoshi Koshida, Susumu Noda

    IEEE International Conference on Group IV Photonics GFP　350-352　2010

    DOI： 10.1109/GROUP4.2010.5643328 　

    ISSN： 1949-2081

  153. Light emission control by photonic crystals Peer-reviewed

    Masayuki Fujita, Susumu Noda

    Technical Digest - 15th OptoElectronics and Communications Conference, OECC2010　92　(10)　220-704　2010

    ISSN： 0019-2341

  154. Light-emitting diodes: Photonic crystal efficiency boost Peer-reviewed

    Susumu Noda, Masayuki Fujita

    Nature Photonics　3　(3)　129-130　2009/03

    DOI： 10.1038/nphoton.2009.15 　

    ISSN： 1749-4885

    eISSN： 1749-4893

  155. Light emission from silicon in photonic crystal nanocavity Peer-reviewed

    Masayuki Fujita, Yoshinori Tanaka, Susumu Noda

    IEEE Journal on Selected Topics in Quantum Electronics　14　(4)　1090-1097　2008/07

    DOI： 10.1109/JSTQE.2008.918941 　

    ISSN： 1077-260X

    eISSN： 1558-4542

  156. Green photoluminescence from GaInN photonic crystals Peer-reviewed

    Hitoshi Kitagawa, Toshihide Suto, Masayuki Fujita, Yoshinori Tanaka, Takashi Asano, Susumu Noda

    Applied Physics Express　1　(3)　0320041-0320043　2008/03

    DOI： 10.1143/APEX.1.032004 　

    ISSN： 1882-0778

    eISSN： 1882-0786

  157. Theoretical analysis of light emission from a coupled system of a photonic nanocavity and a quantum dot Peer-reviewed

    M. Yamaguchi, T. Asano, M. Fujita, S. Noda

    PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 5, NO 9　5　(9)　2828-2830　2008

    ISSN： 1610-1634

  158. Theoretical analysis of light emission from a coupled system of a photonic nanocavity and a quantum dot Peer-reviewed

    M. Yamaguchi, T. Asano, M. Fujita, S. Noda

    Physica Status Solidi (C) Current Topics in Solid State Physics　5　(9)　2828-2830　2008

    DOI： 10.1002/pssc.200779247 　

    ISSN： 1862-6351

    eISSN： 1610-1642

  159. Enhanced light emission from silicon photonic crystal nanocavity Peer-reviewed

    Masayuki Fujita, Yoshinori Tanaka, Yasushi Takahashi, Susumu Noda

    2008 5th International Conference on Group IV Photonics, GFP　359-361　2008

    DOI： 10.1109/GROUP4.2008.4638199 　

  160. Spectral reflectance measurement of two-dimensional photonic nanocavities with embedded quantum dots Peer-reviewed

    Wolfgang C. Stumpf, Takashi Asano, Takanori Kojima, Masayuki Fujita, Yoshinori Tanaka, Susumu Noda

    2008 IEEE/LEOS International Conference on Optical MEMS and Nanophotonics, OPT MEMS　3-4　2008

    DOI： 10.1109/OMEMS.2008.4607799 　

  161. Spontaneous-emission control by photonic crystals and nanocavities

    Susumu Noda, Masayuki Fujita, Takashi Asano

    Nature Photonics　1　(8)　449-458　2007/08

    DOI： 10.1038/nphoton.2007.141 　

    ISSN： 1749-4885

    eISSN： 1749-4893

  162. Light emission from quantum dots embedded in a photonic double-heterostructure nanocavity Peer-reviewed

    Wolfgang C. Stumpf, Masayuki Fujita, Makoto Yamaguchi, Takashi Asano, Susumu Noda

    Optics InfoBase Conference Papers　2007

    DOI： 10.1109/CLEOPR.2007.4391537 　

    eISSN： 2162-2701

  163. Cavity-mode light emission in silicon photonic nanocavities at room temperature Peer-reviewed

    Masayuki Fujita, Yoshinori Tanaka, Susumu Noda

    IEEE International Conference on Group IV Photonics GFP　270-272　2007

    ISSN： 1949-2081

  164. Organic light-emitting diodes with photonic crystals on glass substrate fabricated by nanoimprint lithography Peer-reviewed

    Kuniaki Ishihara, Masayuki Fujita, Ippei Matsubara, Takashi Asano, Susumu Noda, Hiroshi Ohata, Akira Hirasawa, Hiroshi Nakada, Noriyuki Shimoji

    Applied Physics Letters　90　(11)　2007

    DOI： 10.1063/1.2713237 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  165. Light-emission properties of quantum dots embedded in a photonic double-heterostructure nanocavity Peer-reviewed

    Wolfgang C. Stumpf, Masayuki Fujita, Makoto Yamaguchi, Takashi Asano, Susumu Noda

    Applied Physics Letters　90　(23)　2007

    DOI： 10.1063/1.2746059 　

    ISSN： 0003-6951

  166. Controlled spontaneous-emission phenomena in semiconductor slabs with a two-dimensional photonic bandgap Peer-reviewed

    Masayuki Fujita, Shigeki Takahashi, Takashi Asano, Yoshinori Tanaka, Kazuaki Kounoike, Makoto Yamaguchi, Junya Nakanishi, Wolfgang Stumpf, Susumu Noda

    Journal of Optics A: Pure and Applied Optics　8　(4)　S131-S138　2006/04

    DOI： 10.1088/1464-4258/8/4/S12 　

    ISSN： 1464-4258

    eISSN： 1741-3567

  167. Direct fabrication of photonic crystal on glass substrate by nanoimprint lithography Peer-reviewed

    Kuniaki Ishihara, Masayuki Fujita, Ippei Matsubara, Takashi Asano, Susumu Noda

    Japanese Journal of Applied Physics, Part 2: Letters　45　(4-7)　2006/02/03

    DOI： 10.1143/JJAP.45.L210 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  168. Controlling spontaneous emission phenomena in defect-free 2D photonic crystals with quantum dots Peer-reviewed

    Masayuki Fujita, Makoto Yamaguchi, Kazuaki Kounoike, Shigeki Takahashi, Yoshinori Tanaka, Junya Nakanishi, Takashi Asano, Susumu Noda

    Optics InfoBase Conference Papers　2006

    DOI： 10.1109/CLEO.2006.4629136 　

    eISSN： 2162-2701

  169. Photonic crystals - For nano-photonics to display - Peer-reviewed

    S. Noda, T. Asano, M. Fujita

    IDW '06 - Proceedings of the 13th International Display Workshops　3　1935-1935　2006

  170. Simultaneous inhibition and redistribution of spontaneous emission in 2D photonic crystal slabs Peer-reviewed

    Shigeki Takahashi, Masayuki Fujita, Takashi Asano, Yoshinori Tanaka, Susumu Noda

    Proceedings of SPIE - The International Society for Optical Engineering　6127　2006

    DOI： 10.1117/12.663337 　

    ISSN： 0277-786X

    eISSN： 1996-756X

  171. Investigation of spontaneous emission from quantum dots embedded in two-dimensional photonic-crystal slab Peer-reviewed

    K. Kounoike, M. Yamaguchi, M. Fujita, T. Asano, J. Nakanishi, S. Noda

    Electronics Letters　41　(25)　57-58　2005/12/08

    DOI： 10.1049/el:20053011 　

    ISSN： 0013-5194

    eISSN： 1350-911X

  172. Optical and electrical characteristics of organic light-emitting diodes with two-dimensional photonic crystals in organic/electrode layers Peer-reviewed

    Masayuki Fujita, Kuniaki Ishihara, Tetsuya Ueno, Takashi Asano, Susumu Noda, Hiroshi Ohata, Taishi Tsuji, Hitoshi Nakada, Noriyuki Shimoji

    Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers　44　(6 A)　3669-3677　2005/06

    DOI： 10.1143/JJAP.44.3669 　

    ISSN： 0021-4922

  173. Applied physics: Simultaneous inhibition and redistribution of spontaneous light emission in photonic crystals Peer-reviewed

    Masayuki Fujita, Shigeki Takahashi, Yoshinori Tanaka, Takashi Asano, Susumu Noda

    Science　308　(5726)　1296-1298　2005/05/27

    DOI： 10.1126/science.1110417 　

    ISSN： 0036-8075

  174. Theoretical analysis on light-extraction efficiency of organic light-emitting diodes using FDTD and mode-expansion methods Peer-reviewed

    Alongkarn Chutinan, Kuniaki Ishihara, Takashi Asano, Masayuki Fujita, Susumu Noda

    Organic Electronics　6　(1)　3-9　2005/02

    DOI： 10.1016/j.orgel.2004.12.001 　

    ISSN： 1566-1199

  175. Introduction of photonic crystal structure into organic light-emitting diode Peer-reviewed

    Masayuki Fujita, Takashi Asano, Susumu Noda, Hiroshi Ohata, Taishi Tsuji, Hitoshi Nakada, Noriyuki Shimoji

    Proceedings of SPIE - The International Society for Optical Engineering　5624　142-151　2005

    DOI： 10.1117/12.579597 　

    ISSN： 0277-786X

  176. Demonstration of organic light-emitting diodes with photonic crystal on glass substrate fabricated by nanoimprint lithography Peer-reviewed

    K. Ishihara, M. Fujita, I. Matsubara, T. Asano, S. Noda, H. Ohata, A. Hirasawa, H. Nakada, N. Shimoji

    Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS　2005　246-247　2005

    DOI： 10.1109/LEOS.2005.1547971 　

    ISSN： 1092-8081

  177. Spontaneous emission control by defect-free 2D photonic crystal slabs Peer-reviewed

    Masayuki Fujita, Shigeki Takahashi, Yoshinori Tanaka, Takashi Asano, Susumu Noda

    Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS　2005　52-53　2005

    DOI： 10.1109/LEOS.2005.1547865 　

    ISSN： 1092-8081

  178. Direct fabrication of 2D glass photonic crystals by nanoimprint lithography Peer-reviewed

    Kuniaki Ishihara, Masayuki Fujita, Ippei Matsubara, Takashi Asano, Susumu Noda

    Pacific Rim Conference on Lasers and Electro-Optics, CLEO - Technical Digest　2005　239-240　2005

    DOI： 10.1109/CLEOPR.2005.1569409 　

  179. Reduction of operating voltage in organic light-emitting diode by corrugated photonic crystal structure Peer-reviewed

    Masayuki Fujita, Tetsuya Ueno, Kuniaki Ishihara, Takashi Asano, Susumu Noda, Hiroshi Ohata, Taishi Tsuji, Hitoshi Nakada, Noriyuki Shimoji

    Applied Physics Letters　85　(23)　5769-5771　2004/12/06

    DOI： 10.1063/1.1836867 　

    ISSN： 0003-6951

  180. Fabrication of Indium Phosphide Compound Photonic Crystal by Hydrogen Iodide/Xenon Inductively Coupled Plasma Etching

    Fujita Masayuki, Sugitatsu Atsushi, Uesugi Toshitsugu, Noda Susumu

    Jpn J Appl Phys　43　(11)　L1400-L1402　2004/11/01

    Publisher: INSTITUTE OF PURE AND APPLIED PHYSICS

    DOI： 10.1143/JJAP.43.L1400 　

    ISSN： 0021-4922

    More details Close

    An InP-based photonic crystal with vertical hole (${\sim}90$°), smooth sidewall (${<}10$ nm) and high uniformity ($\pm 1$%), is successfully fabricated by inductively coupled plasma (ICP) etching using HI-based gas with only an electron beam resist mask. This can be achieved at a low-temperature processing condition because of the high volatility and sidewall protection of the iodide product. The etching condition is optimized to balance the ion and radial effects by controlling the applied bias and the mixture of Xe gas. We can conclude that HI/Xe ICP etching is very useful for the fabrication of active nano/microdevices.

  181. Fine fabrication of GalnAsP-InP photonic crystal by HI/Xe ICP etching using electron beam resist mask Peer-reviewed

    Masayuki Fujita, Atsushi Sugitatsu, Toshitsugu Uesugi, Susumu Noda

    Digest of Papers - Microprocesses and Nanotechnology 2004　344-345　2004

  182. Organic light-emitting diode with ITO/organic photonic crystal Peer-reviewed

    M. Fujita, T. Ueno, T. Asano, S. Noda, H. Ohhata, T. Tsuji, H. Nakada, N. Shimoji

    Electronics Letters　39　(24)　1750-1752　2003/11/27

    DOI： 10.1049/el:20031126 　

    ISSN： 0013-5194

  183. Lasing characteristics of two-dimensional photonic crystal slab lasers with a modified linear shaped donor-type point defect Peer-reviewed

    Masayuki Fujita, Yoshihiro Akahane, Atsushi Sugitatsu, Takashi Asano, Susumu Noda

    Pacific Rim Conference on Lasers and Electro-Optics, CLEO - Technical Digest　1　167　2003

    DOI： 10.1109/CLEOPR.2003.1274628 　

  184. GaInAsP microdisk injection laser with benzocyclobutene polymer cladding and its atherma effect Peer-reviewed

    Reona Ushigome, Masayuki Fujita, Atsushi Sakai, Toshihiko Baba, Yasuo Kokubun

    Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers　41　(11)　6364-6369　2002/11

    DOI： 10.1143/jjap.41.6364 　

    ISSN： 0021-4922

  185. Microgear laser Peer-reviewed

    Masayuki Fujita, Toshihiko Baba

    Applied Physics Letters　80　(12)　2051-2053　2002/03/25

    DOI： 10.1063/1.1462867 　

    ISSN： 0003-6951

  186. Strain relaxation effect in microdisk lasers with compressively strained quantum wells Peer-reviewed

    Masayuki Fujita, Reona Ushigome, Toshihiko Baba

    Applied Physics Letters　80　(9)　1511-1513　2002/03/04

    DOI： 10.1063/1.1456554 　

    ISSN： 0003-6951

  187. Proposal and finite-difference time-domain simulation of whispering galley mode microgear cavity Peer-reviewed

    Masayuki Fujita, Toshihiko Baba

    IEEE Journal of Quantum Electronics　37　(10)　1253-1258　2001/10

    DOI： 10.1109/3.952536 　

    ISSN： 0018-9197

    eISSN： 1558-1713

  188. GaInAsP microcylinder (microdisk) injection laser with AlInAs(O<inf>x</inf>) claddings Peer-reviewed

    Masayuki Fujita, Reona Ushigome, Toshihiko Baba, Akihiro Matsutani, Fumio Koyama, Kenichi Iga

    Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers　40　(9 A)　5338-5339　2001/09

    DOI： 10.1143/jjap.40.5338 　

    ISSN： 0021-4922

  189. Low-threshold continuous-wave lasing in photopumped GaInAsP microdisk lasers Peer-reviewed

    M. Fujita, K. Teshima, T. Baba

    Japanese Journal of Applied Physics, Part 2: Letters　40　(8 B)　L875-L877　2001/08/15

    DOI： 10.1143/jjap.40.l875 　

    ISSN： 0021-4922

  190. Large spontaneous emission factor of 0.1 in a microdisk injection laser Peer-reviewed

    Masayuki Fujita, Reona Ushigome, Toshihiko Baba

    IEEE Photonics Technology Letters　13　(5)　403-405　2001/05

    DOI： 10.1109/68.920731 　

    ISSN： 1041-1135

  191. Continuous wave lasing in GaInAsP microdisk injection laser with threshold current of 40μA Peer-reviewed

    M. Fujita, R. Ushigome, T. Baba

    Electronics Letters　36　(9)　790-791　2000/04

    DOI： 10.1049/el:20000609 　

    ISSN： 0013-5194

  192. Large spontaneous emission factor confirmed in CW lasing microdisk injection lasers Peer-reviewed

    Masayuki Fujita, Reona Ushigome, Toshihiko Baba

    Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS　1　372-373　2000

    ISSN： 1092-8081

  193. Ultrasmall and ultralow threshold GaInAsP-InP microdisk injection lasers: design, fabrication, lasing characteristics, and spontaneous emission factor Peer-reviewed

    Masayuki Fujita, Atsushi Sakai, Toshihiko Baba

    IEEE Journal on Selected Topics in Quantum Electronics　5　(3)　673-681　1999/05

    DOI： 10.1109/2944.788434 　

    ISSN： 1077-260X

  194. Optical near-field probe action in microdisk laser with 0.12λ resolution Peer-reviewed

    H. Yamada, A. Sakai, M. Fujita, T. Baba

    Electronics Letters　35　(3)　222-223　1999/02/04

    DOI： 10.1049/el:19990106 　

    ISSN： 0013-5194

  195. Novel GaInAsP microcylinder laser with AlInAs(O<inf>x</inf>) claddings Peer-reviewed

    M. Fujita, T. Baba, A. Matsutani, F. Koyama, K. Iga

    Conference Proceedings - International Conference on Indium Phosphide and Related Materials　215-217　1999

    ISSN： 1092-8669

  196. Ultimate low threshold and high efficiency calculated for GaInAsP microdisk injection lasers with optimum posts Peer-reviewed

    M. Fujita, A. Sakai, D. Ohsaki, T. Baba

    CLEO/Pacific Rim 1999 - Pacific Rim Conference on Lasers and Electro-Optics　3　616-617　1999

    DOI： 10.1109/CLEOPR.1999.817747 　

  197. Room temperature continuous wave lasing characteristics of GaInAsP/InP microdisk injection laser Peer-reviewed

    M. Fujita, K. Inoshita, T. Baba

    Electronics Letters　34　(3)　278-279　1998/02/05

    DOI： 10.1049/el:19980109 　

    ISSN： 0013-5194

  198. Proposal of optical near-field probe using evanescent field of microdisk laser Peer-reviewed

    Atsushi Sakai, Hiroshi Yamada, Masayuki Fujita, Toshihiko Baba

    Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers　37　(2)　517-521　1998/02

    DOI： 10.1143/jjap.37.517 　

    ISSN： 0021-4922

  199. Optical near field probe action in a microdisk laser with λ/10 resolution Peer-reviewed

    H. Yamada, A. Sakai, M. Fujita, T. Baba

    Conference Digest - IEEE International Semiconductor Laser Conference　129-130　1998

    ISSN： 0899-9406

  200. Room temperature CW operation in GaInAsP/InP microdisk laser with record low threshold of 150 μA Peer-reviewed

    M. Fujita, K. Inoshita, T. Baba

    Conference Proceedings - International Conference on Indium Phosphide and Related Materials　235-238　1998

    DOI： 10.1109/ICIPRM.1998.712445 　

    ISSN： 1092-8669

  201. Lasing characteristics of GaInAsP-InP strained quantum-well microdisk injection lasers with diameter of 2-10 μm Peer-reviewed

    Toshihiko Baba, Masayuki Fujita, Atsushi Sakai, Mitsuhiro Kihara, Ryoh Watanabe

    IEEE Photonics Technology Letters　9　(7)　878-880　1997/07

    DOI： 10.1109/68.593330 　

    ISSN： 1041-1135

  202. Optical near field probe using evanescent field of microdisk lasers Peer-reviewed

    Toshihiko Baba, Atsushi Sakai, Masayuki Fujita

    Pacific Rim Conference on Lasers and Electro-Optics, CLEO - Technical Digest　303-304　1997

Show all ︎Show first 5

Misc. 104

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    山根秀勝, 山田義春, 近藤裕佑, 宮島健, 冨士田誠之, 村上修一

    応用物理学会学術講演会講演予稿集(CD-ROM)　72nd　2025

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    山根秀勝, 山田義春, 近藤裕佑, 冨士田誠之, 村上修一

    応用物理学会学術講演会講演予稿集(CD-ROM)　86th　2025

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    森田勇希, NGO Nguyen H., 猪瀬裕太, 西田陽亮, 山田義春, 山根秀勝, 村上修一, 冨士田誠之

    電子情報通信学会大会講演論文集(CD-ROM)　2025　2025

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    山田 義春, 近藤 裕佑, 永廣 卓哉, 村上 修一, 冨士田 誠之, 山根 秀勝

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    Publisher: [東京] : Institute of Electrical Engineers of Japan

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    山根秀勝, 山田義春, 近藤裕佑, 永廣卓哉, 村上修一, 冨士田誠之

    センサ・マイクロマシンと応用システムシンポジウム(CD-ROM)　41st　2024

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    山根秀勝, 山田義春, 近藤裕佑, 冨士田誠之, 村上修一

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)　85th　2024

    ISSN： 2758-4704

  7. Theoretical Design and Experimental Demonstration of a Terahertz Broadband Half-Wave Plate Using Silicon Photonic Crystals

    山根秀勝, 山田義春, 近藤裕佑, 永廣卓哉, 冨士田誠之, 村上修一

    光物性研究会論文集(CD-ROM)　35th　2024

  8. Integration of Resonant Tunneling Diodes into Valley Photonic Crystal Waveguides

    伊豫田圭, 山神雄一郎, 西田陽亮, 村上修一, 冨士田誠之, 永妻忠夫

    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

  9. Self-injection locking of resonant-tunneling-diode oscillators with dielectric resonators

    猪瀬裕太, NGUYEN Ngo, 冨士田誠之, 永妻忠夫

    電子情報通信学会大会講演論文集(CD-ROM)　2023　2023

    ISSN： 1349-144X

  10. Experiments on Dielectric Property Measurements at Terahertz Band using Planar Resonantor

    市川大暉, 寺井将貴, 芳我基治, 冨士田誠之, 永妻忠夫

    電子情報通信学会大会講演論文集(CD-ROM)　2023　2023

    ISSN： 1349-144X

  11. Comparison of Topological Valley Photonic Crystal Terahertz Waveguides with Different Interfaces

    山本祥太, NGUYEN H. Ngo, 伊豫田圭, 山田義春, 近藤祐佑, 村上修一, 冨士田誠之, 永妻忠夫

    電子情報通信学会大会講演論文集(CD-ROM)　2023　2023

    ISSN： 1349-144X

  12. 誘電体共振器を用いた共鳴トンネルダイオード発振器の自己注入同期

    猪瀬裕太, NGUYEN Ngo, 冨士田誠之, 永妻忠夫

    シンポジウムテラヘルツ科学の最先端講演要旨集　2023 (CD-ROM)　2023

  13. テラヘルツ誘電体回路

    冨士田 誠之

    テラヘルツ波産業創成の課題と展望，シーエムシー出版, ISBN978-4-7813-1662-8 172-178　66-73　2022/05/31

  14. 共鳴トンネルダイオードによる高精細映像無線伝送

    冨士田 誠之,西田 陽亮

    テラヘルツ波産業創成の課題と展望，シーエムシー出版, ISBN978-4-7813-1662-8　172-178　2022/05/31

  15. Device and Circuit Technologies for Terahertz Integrated Systems

    冨士田誠之

    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

  16. RTD Transceiver Project

    Masayuki Fujita, Julian Webber, Tadao Nagatsuma

    Springer Series in Optical Sciences　234　461-466　2022

    DOI： 10.1007/978-3-030-73738-2_44 　

    ISSN： 0342-4111

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  17. 共鳴トンネルダイオードとシリコンフォトニック構造が拓くテラヘルツ帯集積基盤技術の進展

    冨士田 誠之

    Optronics : 光技術コーディネートジャーナル　40　(10)　97-102　2021/10

    Publisher: オプトロニクス社

    ISSN： 0286-9659

  18. Experiment on electromagnetic wave propagation in distorted photonic crystal

    Nanjo Kanji, Kitagawa Hitoshi, Kitamura Kyoko, Headland Daniel, Fujita Masayuki

    JSAP Annual Meetings Extended Abstracts　2021.1　945-945　2021/02/26

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/jsapmeeting.2021.1.0_945 　

    eISSN： 2436-7613

  19. Design of Broadband Diplexer using Valley Photonic Crystals

    Iyoda Kei, Yamagami Yuichiro, Fujita Masayuki, Nagatsuma Tadao

    JSAP Annual Meetings Extended Abstracts　2021.1　946-946　2021/02/26

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    DOI： 10.11470/jsapmeeting.2021.1.0_946 　

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  20. Terahertz Pulse Induced Harmonic Generation in Resonant Tunneling Diode Oscillator

    Arikawa Takashi, Kim Jaeyoung, Mukai Toshikazu, Nishigami Naoki, Fujita Masayuki, Nagatsuma Tadao, Tanaka Koichiro

    JSAP Annual Meetings Extended Abstracts　2021.1　835-835　2021/02/26

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/jsapmeeting.2021.1.0_835 　

    eISSN： 2436-7613

  21. Design of Efficient Coupling between Valley Photonic Crystal Waveguide and Metallic Line

    Yamagami Yuichiro, Nishida Yosuke, Fujita Masayuki, Nagatsuma Tadao

    JSAP Annual Meetings Extended Abstracts　2021.1　947-947　2021/02/26

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/jsapmeeting.2021.1.0_947 　

    eISSN： 2436-7613

  22. Design and evaluation of 600-GHz-band silicon dielectric waveguide module

    柴田紀彦, 上村悠太, 川本勇真, YI Li, 冨士田誠之, 永妻忠夫

    電子情報通信学会大会講演論文集(CD-ROM)　2021　2021

    ISSN： 1349-144X

  23. Two-dimensional Imaging System using a Single Resonant Tunneling Diode Transceiver

    水野遼子, YI Li, 要遼平, 大城敦司, 岩松秀弥, 西田陽亮, 冨士田誠之, 永妻忠夫

    電子情報通信学会大会講演論文集(CD-ROM)　2021　2021

    ISSN： 1349-144X

  24. Pulsed injection locking dynamics of resonant tunneling diode terahertz oscillators

    Arikawa Takashi, Kim Jaeyoung, Mukai Toshikazu, Nishigami Naoki, Fujita Masayuki, Nagatsuma Tadao, Tanaka Koichiro

    JSAP Annual Meetings Extended Abstracts　2020.2　752-752　2020/08/26

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/jsapmeeting.2020.2.0_752 　

    eISSN： 2436-7613

  25. Coherent electric field sampling of resonant tunneling diode terahertz oscillators

    Arikawa Takashi, Kim Jaeyoung, Mukai Toshikazu, Nishigami Naoki, Fujita Masayuki, Nagatsuma Tadao, Tanaka Koichiro

    JSAP Annual Meetings Extended Abstracts　2020.1　887-887　2020/02/28

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/jsapmeeting.2020.1.0_887 　

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  26. Enhancement of Baseband Bandwidth of Differential Ring Oscillator using Resonant Tunneling Diodes

    Iwamatsu Shuya, Nishigami Naoki, Nishida Yousuke, Fujita Masayuki, Nagatsuma Tadao

    JSAP Annual Meetings Extended Abstracts　2020.1　885-885　2020/02/28

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/jsapmeeting.2020.1.0_885 　

    eISSN： 2436-7613

  27. Injection locking dynamics of resonant tunneling diode terahertz oscillators

    Arikawa T., Kim J., Mukai T., Nishigami N., Fujita M., Nagatsuma T., Tanaka K.

    Meeting Abstracts of the Physical Society of Japan　75.1　1442-1442　2020

    Publisher: The Physical Society of Japan

    DOI： 10.11316/jpsgaiyo.75.1.0_1442 　

    eISSN： 2189-0803

  28. Recent Trend and Future Prospect of Integrated Systems for Terahertz Sensing and Imaging

    永妻忠夫, YI Li, 冨士田誠之, 匂坂知貴, 要遼平

    電子情報通信学会大会講演論文集(CD-ROM)　2020　2020

    ISSN： 1349-144X

  29. 600-GHz-band Diplexer Using Photonic Crystals and Its Application to Wireless Communications

    柴田紀彦, 上村悠太, 東本大樹, YI Li, 冨士田誠之, 永妻忠夫

    電子情報通信学会大会講演論文集(CD-ROM)　2020　2020

    ISSN： 1349-144X

  30. 300-GHz-band Wireless Communication Using Pulse Amplitude Modulation-4

    大城敦司, 西上直毅, 山本拓実, WEBBER Julian, 冨士田誠之, 永妻忠夫

    電子情報通信学会大会講演論文集(CD-ROM)　2020　2020

    ISSN： 1349-144X

  31. Ultralow-loss Branch Waveguide Using Valley Photonic Crystals

    Yamagami Yuichiro, Yu Xiongbin, Kumar Abhishek, Pitchappa Prakash, Singh Ranjan, Fujita Masayuki, Nagatsuma Tadao

    JSAP Annual Meetings Extended Abstracts　2019.2　1041-1041　2019/09/04

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/jsapmeeting.2019.2.0_1041 　

    eISSN： 2436-7613

  32. Terahertz fiber transmission using resonant tunneling diodes (2) – Introduction of photonic-crystal interface –

    Yu Xiongbin, Obata Katsunori, Miyamoto Tomoyuki, Hosoda Yasuo, Kim Jaeyoung, Fujita Masayuki, Nagatsuma Tadao

    JSAP Annual Meetings Extended Abstracts　2019.1　881-881　2019/02/25

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/jsapmeeting.2019.1.0_881 　

    eISSN： 2436-7613

  33. Terahertz fiber transmission using resonant tunneling diodes (1) – Investigation of terahertz fiber –

    Obata Katsunori, Yu Xiongbin, Kim Jaeyoung, Fujita Masayuki, Nagatsuma Tadao, Miyamoto Tomoyuki, Hosoda Yasuo

    JSAP Annual Meetings Extended Abstracts　2019.1　880-880　2019/02/25

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/jsapmeeting.2019.1.0_880 　

    eISSN： 2436-7613

  34. Terahertz Waveguides Using Photonic Topological Insulators

    Yamagami Yuichiro, Yang Yihao, Yu Xiongbin, Fujita Masayuki, Nagatsuma Tadao, Singh Ranjan

    JSAP Annual Meetings Extended Abstracts　2019.1　936-936　2019/02/25

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/jsapmeeting.2019.1.0_936 　

    eISSN： 2436-7613

  35. 共鳴トンネルダイオードテラヘルツ発振器の電場波形測定

    有川敬, 金在瑛, 向井俊和, 西上直毅, 冨士田誠之, 永妻忠夫, 田中耕一郎, 田中耕一郎

    シンポジウムテラヘルツ科学の最先端講演要旨集　2019　2019

  36. 高速移動被写体の600GHz帯イメージング

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    電子情報通信学会大会講演論文集(CD-ROM)　2019　2019

    ISSN： 1349-144X

  37. THz Wireless Communications using OOK & CDMA Modulation with Resonant Tunneling Diodes

    WEBBER Julian, NISHIGAMI Naoki, KIM Jae-Young, FUJITA Masayuki, NAGATSUMA Tadao

    電子情報通信学会大会講演論文集(CD-ROM)　2019　2019

    ISSN： 1349-144X

  38. Ultra-high-speed terahertz communications using low-loss and small-dispersion photonic-crystal waveguides

    Yu Xiongbin, Sugeta Masaki, Yamagami Yuuichirou, Fujita Masayuki, Nagatsuma Tadao

    JSAP Annual Meetings Extended Abstracts　2018.2　945-945　2018/09/05

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/jsapmeeting.2018.2.0_945 　

    eISSN： 2436-7613

  39. Design and Characterization of 1 THz-band Photonic-Crystal Waveguides

    Sugeta Masaki, Fujita Masayuki, Nagatsuma Tadao

    JSAP Annual Meetings Extended Abstracts　2018.2　878-878　2018/09/05

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/jsapmeeting.2018.2.0_878 　

    eISSN： 2436-7613

  40. Stabilization of Resonant Tunneling Diode Oscillator Using Photonic Crystal Cavity

    Yu Xiongbin, Yamada Ryoumei, Kim Jaeyoung, Fujita Masayuki, Nagatsuma Tadao

    JSAP Annual Meetings Extended Abstracts　2018.1　1039-1039　2018/03/05

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/jsapmeeting.2018.1.0_1039 　

    eISSN： 2436-7613

  41. Integration of Resonant Tunneling Diodes with Photonic Crystal Waveguide for Terahertz Communications

    Yu Xiongbin, Yamada Ryoumei, Kim Jaeyoung, Fujita Masayuki, Nagatsuma Tadao

    JSAP Annual Meetings Extended Abstracts　2018.1　1040-1040　2018/03/05

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/jsapmeeting.2018.1.0_1040 　

    eISSN： 2436-7613

  42. A Differential Ring Oscillator using Resonant Tunneling Diodes

    Kimura Yuki, Kim Jaeyoung, Diebold Sebastian, Fujita Masayuki, Nagatsuma Tadao

    JSAP Annual Meetings Extended Abstracts　2018.1　1026-1026　2018/03/05

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/jsapmeeting.2018.1.0_1026 　

    eISSN： 2436-7613

  43. Design of Broadband and Highly Efficient Coupling between Photonic Crystal Waveguide and Metallic Line

    Yu Xiongbin, Yamada Ryoumei, Kim Jaeyoung, Fujita Masayuki, Nagatsuma Tadao

    JSAP Annual Meetings Extended Abstracts　2017.2　889-889　2017/08/25

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/jsapmeeting.2017.2.0_889 　

    eISSN： 2436-7613

  44. Terahertz Photonic Crystals and Their Device Applications

    FUJITA Masayuki

    The Review of Laser Engineering　45　(12)　752-752　2017

    Publisher: The Laser Society of Japan

    DOI： 10.2184/lsj.45.12_752 　

    ISSN： 0387-0200

    More details Close

    A photonic crystal, which is composed of dielectric periodic microstructures, can confineelectromagnetic waves within it using the photonic bandgap effect with low loss. In this paper, the recentprogress in the development and application of photonic crystals in the terahertz frequency band, ofwhich is located between that of radio and light waves, is reviewed.Key Words: Terahertz, Photonic crystal, Photonic bandgap, Waveguide

  45. Invited Talk : Modeling of Resonant Tunneling Diodes and their Application to Short Distance Terahertz Wireless Communications (電子デバイス)

    Diebold S., Fujita M., Nagatsuma T.

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報　116　(375)　81-86　2016/12/19

    Publisher: 電子情報通信学会

    ISSN： 0913-5685

  46. Modeling of External Feedback Effect of Resonant Tunneling Diode Oscillator for Terahertz Applications (マイクロ波・ミリ波フォトニクス)

    MANH Luong Duy, NISHIO Kousuke, NISHIDA Yousuke, DIEBOLD Sebastian, KIM Jaeyoung, TSURUDA Kazuisao, MUKAI Toshikazu, FUJITA Masayuki, NAGATSUMA Tadao

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報　116　(297)　7-12　2016/11/14

    Publisher: 電子情報通信学会

    ISSN： 0913-5685

  47. A compact terahertz spectroscopy system using resonant tunneling diode and photonic crystal cavity

    116　(297)　1-5　2016/11/14

    Publisher: 電子情報通信学会

    ISSN： 0913-5685

  48. フォトニック結晶構造を用いたテラヘルツ素子 (特集 メタマテリアル)

    冨士田 誠之

    光技術コンタクト = Optical and electro-optical engineering contact　54　(11)　37-42　2016/11

    Publisher: 光学工業技術協会

    ISSN： 0913-7289

  49. Highly Sensitive Terahertz Sensing using High-Q Photonic Crystal Cavity

    Okamoto Kazuma, Hisatake Shintaro, Fujita Masayuki, Nagatsuma Tadao

    JSAP Annual Meetings Extended Abstracts　2016.1　874-874　2016/03/03

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/jsapmeeting.2016.1.0_874 　

    eISSN： 2436-7613

  50. C-14-8 Design of High Output Power Resonant Tunneling Diode Oscillators at 300 GHz

    Nishio Kousuke, Diebold Sebastian, Tsuruda Kazuisao, Mukai Toshikazu, Kim Jaeyoung, Fujita Masayuki, Nagatsuma Tadao

    Proceedings of the IEICE General Conference　2016　(1)　233-233　2016/03/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

  51. C-14-10 A Terahertz Tag Using Terahertz Photonic Crystal Slabs

    Ueda Shunji, Fujita Masayuki, Nagatsuma Tadao

    Proceedings of the IEICE General Conference　2016　(1)　235-235　2016/03/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

  52. CI-5-6 Integration of Terahertz Photonic Crystals and Terahertz Diodes

    Fujita Masayuki

    Proceedings of the IEICE General Conference　2016　(1)　"SS-48"-"SS-49"　2016/03/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

  53. Terahertz-wave manipulation using photonic-crystal slabs and its applications

    FUJITA Masayuki

    Oyo Buturi　85　(6)　490-495　2016

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/oubutsu.85.6_490 　

    ISSN： 0369-8009

    More details Close

    <p>Photonic crystals are analogous to solid state crystals for manipulating photons, and they are composed of dielectric materials having a periodic distribution of the refractive index. In particular, two-dimensional photonic-crystal slabs are promising photonic structures for practical applications owing to their strong optical confinement in simple thin structures. In this paper, the author presents the recent challenges to realizing compact components and integrating devices using a silicon photonic-crystal slab in terahertz-wave regions, in which the frequencies are located between those of radio and light waves (0.1-10THz). Extremely low-loss terahertz waveguides and the trapping and capturing of a terahertz wave in a photonic-crystal slab were successfully demonstrated. This study shows that terahertz photonic-crystal slabs hold the potential for various applications, including communication and sensing.</p>

  54. フォトニック結晶によるテラヘルツ波の操作 (特集 物理科学,この1年) -- (原子・分子物理,量子エレクトロニクス)

    冨士田 誠之

    パリティ　31　(1)　11-13,1　2016/01

    Publisher: 丸善

    ISSN： 0911-4815

  55. Terahertz photonic crystals and their applications to communications

    34　(9)　75-80　2015/09

    Publisher: オプトロニクス社

    ISSN： 0286-9659

  56. A Terahertz Transceiver Composed of Photonic Crystal and Resonant Tunneling Diodes

    YATA MASHIRO, SUMINOKURA ASAKO, TSURUDA KAZUISAO, MUKAI TOSHIKAZU, FUJITA MASAYUKI, NAGATSUMA TADAO

    JSAP Annual Meetings Extended Abstracts　2015.2　749-749　2015/08/31

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/jsapmeeting.2015.2.0_749 　

    eISSN： 2436-7613

  57. Analysis of Transmission Bandwidth of Terahertz Photonic-Crystal Waveguide

    YATA MASHIRO, FUJITA MASAYUKI, NAGATSUMA TADAO

    JSAP Annual Meetings Extended Abstracts　2015.2　792-792　2015/08/31

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/jsapmeeting.2015.2.0_792 　

    eISSN： 2436-7613

  58. C-14-1 1.5 Gbps Wireless Communication with Terahertz Detector Using High Electron Mobility Transistor

    Suzuki Safumi, Nakai Shunsuke, Nishio Kousuke, Fujita Masayuki, Nagatsuma Tadao, Asada Masahiro

    Proceedings of the Society Conference of IEICE　2015　(1)　167-167　2015/08/25

    Publisher: The Institute of Electronics, Information and Communication Engineers

  59. C-14-11 Evaluation of Reflection Characteristics in Terahertz Photonic Crystal Slabs

    Nishii Hiroki, Fujita Masayuki, Hirata Akihiko, Ajito Katsuhiro, Nagatsuma Tadao

    Proceedings of the IEICE General Conference　2015　(1)　229-229　2015/02/24

    Publisher: The Institute of Electronics, Information and Communication Engineers

  60. C-14-12 Broadband Operation in Resonant Tunneling Diodes Integrated with Dipole Antenna

    Nakai Shunsuke, Diebold Sebastian, Tsuruda Kazuisao, Mukai Toshikazu, Fujita Masayuki, Nagatsuma Tadao

    Proceedings of the IEICE General Conference　2015　(1)　230-230　2015/02/24

    Publisher: The Institute of Electronics, Information and Communication Engineers

  61. Ultralow-loss Terahertz Waveguides Using a Two-dimensional Photonic Crystal

    TSURUDA Kazuisao, SUMINOKURA Asako, FUJITA Masayuki, NAGATSUMA Tadao

    Technical report of IEICE. OPE　114　(430)　121-126　2015/01/29

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    Terahertz (THz) electromagnetic waves, which are located between the radio and light-wave regions (0.1-10 THz), have recently attracted much attention because of their many potential applications such as spectroscopic sensing, nondestructive imaging and ultra-broadband wireless communications. However, most existing THz-wave systems are cumbersome because they consist of bulky discrete components. Developing compact and integrated THz-wave devices is required to open new possible applications. In case use of metallic transmission lines in THz region, the intrinsic loss of metals becomes serious in contrast to microwave region. Here we focus on a two-dimensional photonic crystal where sufficient confinement of THz waves can be achieved in a thin dielectric structure with ultralow loss, as a THz-wave integration platform. In this paper, we report that the propagation and bending losses of the photonic-crystal waveguide are as small as <0.1 dB/cm and 0.3 dB/bend, respectively, in the 0.3-THz band. Also, we demonstrate 1.5-Gbit/s THz-wave communications and high-definition video transmission in the photonic-crystal waveguide of as long as 50 cm with bends of 28 times thanks to the ultralow loss properties.

  62. 極低損失テラヘルツ帯二次元フォトニック結晶導波路—Ultralow-loss Terahertz Waveguides Using a Two-dimensional Photonic Crystal—レーザ・量子エレクトロニクス

    鶴田 一魁, 隅倉 麻子, 冨士田 誠之

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報　114　(432)　121-126　2015/01

    Publisher: 一般社団法人電子情報通信学会

    ISSN： 0913-5685

  63. C-14-5 300-GHz-band Receivers using Tapered Slot Array Antenna

    Oka Masatoshi, Tsuji Daiki, Inoue Masami, Naoki Nagaoka, Hodono Masayuki, Fujita Masayuki, Nagatsuma Tadao

    Proceedings of the Society Conference of IEICE　2014　(1)　195-195　2014/09/09

    Publisher: The Institute of Electronics, Information and Communication Engineers

  64. C-14-8 10 Gbps Terahertz Wireless Communications using Resonant Tunneling Diode Receiver

    Tsuji Daiki, Kaku Ai, Tsuruda Kazuisao, Mukai Toshikazu, Fujita Masayuki, Nagatsuma Tadao

    Proceedings of the IEICE General Conference　2014　(1)　278-278　2014/03/04

    Publisher: The Institute of Electronics, Information and Communication Engineers

  65. Analysis of Optical Absorption in Realistic µc-Si Photonic-Crystal Solar Cells

    Tanaka Yoshinori, Kawamoto Yosuke, Ishizaki Kenji, Zoysa Menaka, Umeda Takami, Fujita Shoya, Asano Takashi, Shigeta Hiroaki, Fujita Masayuki, Noda Susumu

    JSAP Annual Meetings Extended Abstracts　2014.1　789-789　2014/03/03

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/jsapmeeting.2014.1.0_789 　

    eISSN： 2436-7613

  66. Fabrication of Microcrystalline Silicon Solar Cells on Photonic Crystals

    Umeda Takami, De Zoysa Menaka, Ishizaki Kenji, Tanaka Yoshinori, Kawamoto Yosuke, Fujita Syoya, Shigeta Hiroaki, Fujita Masayuki, Noda Susumu

    JSAP Annual Meetings Extended Abstracts　2014.1　788-788　2014/03/03

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/jsapmeeting.2014.1.0_788 　

    eISSN： 2436-7613

  67. Characteristics of µc-Si Solar Cells on Photonic Crystals

    De Zoysa Menaka, Ishizaki Kenji, Umeda Takami, Tanaka Yoshinori, Fujita Shouya, Kawamoto Yousuke, Shigeta Hiroaki, Fujita Masayuki, Noda Susumu

    JSAP Annual Meetings Extended Abstracts　2014.1　790-790　2014/03/03

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/jsapmeeting.2014.1.0_790 　

    eISSN： 2436-7613

  68. Basic Studies on Microcrystalline-Silicon Solar Cells with Photonic-Crystal Structures

    Ishizaki Kenji, De Zoysa Menaka, Tanaka Yoshinori, Umeda Takami, Kawamoto Yosuke, Fujita Shoya, Shigeta Hiroaki, Fujita Masayuki, Noda Susumu

    JSAP Annual Meetings Extended Abstracts　2014.1　3551-3551　2014/03/03

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/jsapmeeting.2014.1.0_3551 　

    eISSN： 2436-7613

  69. Investigation of Superstrate-Type Thin-Film Silicon Solar Cells on Photonic Crystals

    Shigeta Hiroaki, Tanaka Yoshinori, Fujita Masayuki, Ishizaki Kenji, De Zoysa Menaka, Noda Susumu

    JSAP Annual Meetings Extended Abstracts　2014.1　786-786　2014/03/03

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/jsapmeeting.2014.1.0_786 　

    eISSN： 2436-7613

  70. Broadband Operation in Diplexers using a Photonic-Crystal Directional Coupler

    Yata Masahiro, Kakimi Ryoma, Fujita Masayuki, Nagatsuma Tadao

    JSAP Annual Meetings Extended Abstracts　2014.1　770-770　2014/03/03

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/jsapmeeting.2014.1.0_770 　

    eISSN： 2436-7613

  71. THz and Security Applications—Detectors, Sources and Associated Electronics for THz Applications

    冨士田 誠之, 永妻 忠夫

    NATO Science for Peace and Security Series B: Physics and Biophysics　2014

    Publisher: Springer Netherlands

    DOI： 10.1007/978-94-017-8828-1 　

    ISSN： 1874-6500

    eISSN： 1874-6535

  72. Evaluation of Sensitivity for Resonant Tunneling Diode Receiver

    Tsuji Daiki, Kaku Ai, Tsuruda Kazuisao, Mukai Toshikazu, Fujita Masayuki, Nagatsuma Tadao

    Proceedings of the Society Conference of IEICE　2013　(1)　255-255　2013/09/03

    Publisher: The Institute of Electronics, Information and Communication Engineers

  73. フォトニック結晶上への微結晶シリコン形成に関する検討

    石崎 賢司, 川本 洋輔, 梅田 尚実, 田中 良典, 浅野 卓, 重田 博昭, 冨士田 誠之, 野田 進

    応用物理学会学術講演会講演予稿集　2013.2　1730-1730　2013/08/31

    Publisher: 公益社団法人 応用物理学会

    DOI： 10.11470/jsapmeeting.2013.2.0_1730 　

    eISSN： 2436-7613

  74. フォトニック結晶のバンド端共鳴効果による広帯域光吸収増大効果の実験的検討

    川本 洋輔, 石崎 賢司, 梅田 尚実, 田中 良典, 重田 博昭, 冨士田 誠之, 浅野 卓, 野田 進

    応用物理学会学術講演会講演予稿集　2013.1　753-753　2013/03/11

    Publisher: 公益社団法人 応用物理学会

    DOI： 10.11470/jsapmeeting.2013.1.0_753 　

    eISSN： 2436-7613

  75. フォトニック結晶スラブを用いたテラヘルツ波吸収体

    垣見 亮磨, 冨士田 誠之, 永井 正也, 芦田 昌明, 永妻 忠夫

    応用物理学会学術講演会講演予稿集　2013.1　908-908　2013/03/11

    Publisher: 公益社団法人 応用物理学会

    DOI： 10.11470/jsapmeeting.2013.1.0_908 　

    eISSN： 2436-7613

  76. C-14-9 Investigation of a Photonic-Crystal S lab for Terahertz-Wave Integrated Circuits(2)-Evaluation of Photonic-Crystal Waveguides-

    Ishigaki Tsukasa, Fujita Masayuki, Nagatsuma Tadao

    Proceedings of the IEICE General Conference　2013　(1)　289-289　2013/03/05

    Publisher: The Institute of Electronics, Information and Communication Engineers

  77. C-14-13 Gain Improvement for a Tapered-Slot Antenna Using Phonotic-Bandgap Structures

    Horiguchi Shogo, Kitamura Ritsuya, Fujita Masayuki, Nagatsuma Tadao

    Proceedings of the Society Conference of IEICE　2012　(1)　253-253　2012/08/28

    Publisher: The Institute of Electronics, Information and Communication Engineers

  78. 光起電力素子の光電変換効率増大に向けたフォトニック結晶共振作用の最適化(VI)〜超格子構造の導入〜

    田中 良典, 川本 洋輔, 冨士田 誠之, 重田 博昭, 野田 進

    応用物理学会学術講演会講演予稿集　2012.2　810-810　2012/08/27

    Publisher: 公益社団法人 応用物理学会

    DOI： 10.11470/jsapmeeting.2012.2.0_810 　

    eISSN： 2436-7613

  79. C-14-19 Investigation of a Photonic-Crystal Slab for Terahertz-Wave Integrated Circuits

    Ishigaki Tsukasa, Fujita Masayuki, Nagatsuma Tadao

    Proceedings of the IEICE General Conference　2012　(1)　300-300　2012/03/06

    Publisher: The Institute of Electronics, Information and Communication Engineers

  80. 光起電力素子の光電変換効率増大に向けたフォトニック結晶共振作用の最適化(IV)

    田中 良典, 冨士田 誠之, 重田 博昭, 原 潤一, 宮西 晋太郎, 野田 進

    応用物理学会学術講演会講演予稿集　2012.1　819-819　2012/02/29

    Publisher: 公益社団法人 応用物理学会

    DOI： 10.11470/jsapmeeting.2012.1.0_819 　

    eISSN： 2436-7613

  81. 光起電力素子の光電変換効率増大に向けたフォトニック結晶共振作用の最適化（III）

    重田 博昭, 冨士田 誠之, 田中 良典, 小川 裕之, 津田 裕介, 野田 進

    応用物理学会学術講演会講演予稿集　2011.1　890-890　2011/03/09

    Publisher: 公益社団法人 応用物理学会

    DOI： 10.11470/jsapmeeting.2011.1.0_890 　

    eISSN： 2436-7613

  82. 光起電力素子の光電変換効率増大に向けたフォトニック結晶共振作用の最適化（II）

    重田 博昭, 冨士田 誠之, 田中 良典, 津田 裕介, 野田 進

    応用物理学会学術講演会講演予稿集　2010.2　595-595　2010/08/30

    Publisher: 公益社団法人 応用物理学会

    DOI： 10.11470/jsapmeeting.2010.2.0_595 　

    eISSN： 2436-7613

  83. Er発光中心をもつGaAsナノ共振器の発光中心と共振モードの相互作用の検討

    冨士田 誠之, 西川 敦, 寺井 慶和, 藤原 康文, 野田 進

    応用物理学会学術講演会講演予稿集　2010.2　593-593　2010/08/30

    Publisher: 公益社団法人 応用物理学会

    DOI： 10.11470/jsapmeeting.2010.2.0_593 　

    eISSN： 2436-7613

  84. フォトニック結晶発光素子--フォトニック結晶を利用した超高効率発光素子へ向けて (特集 紫外-可視-赤外 最新半導体光源の可能性)

    冨士田 誠之, 野田 進

    光アライアンス　21　(4)　14-19　2010/04

    Publisher: 日本工業出版

    ISSN： 0917-026X

  85. 単一量子ドットの位置検出と発光特性評価 -量子ドットとナノ共振器の結合系の高度化に向けて-

    児島 貴徳, 児島 一信, 中村 達也, 山口 真, 浅野 卓, 冨士田 誠之, 野田 進

    応用物理学会学術講演会講演予稿集　2010.1　730-730　2010/03/03

    Publisher: 公益社団法人 応用物理学会

    DOI： 10.11470/jsapmeeting.2010.1.0_730 　

    eISSN： 2436-7613

  86. 活性層貫通型GaInNフォトニック結晶の発光の温度依存性

    北川 均, 須藤 俊英, 冨士田 誠之, 浅野 卓, 野田 進

    応用物理学会学術講演会講演予稿集　2010.1　735-735　2010/03/03

    Publisher: 公益社団法人 応用物理学会

    DOI： 10.11470/jsapmeeting.2010.1.0_735 　

    eISSN： 2436-7613

  87. 高圧水蒸気アニール処理を行ったシリコンフォトニック結晶の発光特性

    冨士田 誠之, 越田 信義, 野田 進

    応用物理学会学術講演会講演予稿集　2010.1　733-733　2010/03/03

    Publisher: 公益社団法人 応用物理学会

    DOI： 10.11470/jsapmeeting.2010.1.0_733 　

    eISSN： 2436-7613

  88. フォトニック結晶技術の最新展開 (特集 高度情報化社会を先導する光学材料)

    酒井 恭輔, 田中 良典, 冨士田 誠之

    工業材料　58　(3)　41-45　2010/03

    Publisher: 日刊工業出版プロダクション

    ISSN： 0452-2834

  89. フォトニック結晶による究極的な発光制御

    冨士田 誠之

    オプトロニクス2月号 vol.28, no.2　128-137　2009

  90. 量子ドットを含んだナノ共振器・導波路結合系の基礎光学特性

    小島一信, 井上博揮, STUMPF Wolfgang, 中村達也, 山口真, 児島貴徳, 冨士田誠之, 浅野卓, 野田進

    応用物理学関係連合講演会講演予稿集　56th　(3)　2009

  91. 2次元フォトニック結晶ナノ共振器の反射スペクトルの理論解析

    中村達也, STUMPF W., 児島貴徳, 小島一信, 田中良典, 冨士田誠之, 浅野卓, 野田進

    応用物理学会学術講演会講演予稿集　70th　(3)　2009

  92. フォトニックナノ構造をもつシリコンからの発光現象--フォトニック結晶・ナノ共振器によるシリコンの発光制御 (特集 シリコンを光らせる)

    冨士田 誠之, 田中 良典, 野田 進

    光アライアンス　20　(1)　8-13　2009/01

    Publisher: 日本工業出版

    ISSN： 0917-026X

  93. Light Emission Control by Photonic Crystals

    FUJITA Masayuki, NODA Susumu

    Journal of the Illuminating Engineering Institute of Japan　92　(10)　699-704　2008/10/01

    Publisher: The Illuminating Engineering Institute of Japan (IEIJ)

    ISSN： 0019-2341

  94. <大学の研究・動向> フォトニック結晶工学の進展

    野田 進, 浅野 卓, 冨士田 誠之

    Cue : 京都大学電気関係教室技術情報誌　19　(19)　3-6　2008/03

    Publisher: 京都大学電気関係教室・洛友会

    DOI： 10.14989/57935 　

    ISSN： 1882-5214

  95. 強励起条件におけるシリコンフォトニック結晶ナノ共振器の発光増強現象

    冨士田誠之, 田中良典, 高橋和, 野田進

    応用物理学会学術講演会講演予稿集　69th　(3)　2008

  96. 2次元フォトニック結晶光ナノ共振器の顕微ラマン分光測定(II)

    高橋和, 田中良典, 冨士田誠之, 浅野卓, 野田進

    応用物理学会学術講演会講演予稿集　69th　(3)　2008

  97. 2次元フォトニック結晶光ナノ共振器の顕微ラマン分光測定

    高橋和, 冨士田誠之, 萩野裕幸, 杉谷知昭, 浅野卓, 野田進

    応用物理学関係連合講演会講演予稿集　55th　(3)　2008

  98. ナノ共振器・量子ドット強結合系における共鳴時の3番目の発光ピーク

    山口真, 浅野卓, 小島一信, 冨士田誠之, 野田進

    応用物理学会学術講演会講演予稿集　69th　(3)　2008

  99. Light Emission Control by Photonic Bandgap

    Fujita M., Takahashi S., Tanaka Y., Asano T., Noda S.

    The Review of Laser Engineering　36　(0)　170-173　2008

    Publisher: The Laser Society of Japan

    DOI： 10.2184/lsj.36.170 　

    ISSN： 0387-0200

  100. Light Emission Control by Photonic Bandgap

    FUJITA Masayuki, NODA Susumu

    The Review of Laser Engineering　34　(11)　761-766　2006

    Publisher: The Laser Society of Japan

    DOI： 10.2184/lsj.34.761 　

    ISSN： 0387-0200

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    We discuss an ultimate light-emission control method by using a two-dimensional photonic bandgap. Calculations predict that a spontaneous emission coupled to the slab modes, which is strongly confined within the slab plane, is inhibited. The saved energy efficiently becomes a spontaneous emission that is coupled to the vertical modes. Controlling the spontaneous emission is experimentally demonstrated by measuring timeresolved photoluminescence spectra from GaInAsP quantum-well samples. The suppression of non-radiative processes that compete the spontaneous emission is achieved by the introduction of InAs quantum dots, which can confine carriers in three dimensions. An artificial point-defect cavity introduced in the photonic crystal can lead to a cavity-mode emission at an extremely low excitation density. Our results demonstrate the realization of an ideal two-dimensional photonic-bandgap environment, and open up possibilities for various applications of photonic crystals using spontaneous-emission phenomena.

  101. フォトニック結晶による自然放出制御

    冨士田 誠之

    オプトロニクス 24・11　121-126　2005

  102. Disk Photonic Integrated Devices

    BABA Toshihiko, FUJITA Masayuki, SAKAI Atsushi, FUKAYA Naoyuki, ICHIKAWA Hiroyuki, MOTEGI Ayumu

    Technical report of IEICE. OPE　101　(92)　1-6　2001/05/18

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

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    Recent activities of our group on microdisk photonic integrated devices are reviewed, which have a high refractive index film processed into various shapes and achieve 3-dimensional optical confinement usable for ultra-small functional devices and circuits. It includes the room temperature cw operation with ultra-low threshold in GainAsP microdisk lasers, evaluation of very large spontaneous emission factor, mode analysis by the micro-probing technology, mode stabilization by the microgear structure, reduction in surface recombination by the methane plasma irradiation, demonstration of low loss waveguides and bends on SOI wafer, and demonstration of photonic crystal waveguides on SOI wafer, which shows the clear correspondence with photonic band calculation.

  103. The Optimum Design and Continuous Wave Lasing in GaInAsP Microdisk Injection Lasers GaInAsP

    FUJITA Masayuki, SAKAI Atsushi, BABA Toshihiko

    Technical report of IEICE. LQE　98　(617)　7-13　1999/02/24

    Publisher: The Institute of Electronics, Information and Communication Engineers

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    We calculated lasing characteristics of GaInAsP microdisk injection lasers, taking account of the scattering loss at center posts and the carrier diffusion effect. We found that the optimum width of the disk edge is O.6-0.7 μm and the minimum threshold current is 〜10 μA. The internal differential quantum efficiency can be 50-95 % depending on the condition of quantum-well active layer. We obtained the first room temperature CW operation with a record low threshold of 150μA, which mainly owed to the reduction of the threshold current density. The spontaneous emission factor was estimated to be 6×10^<-3>, which was much reduced by a large detuning of the lasing wavelength against the spontaneous emission peak.

  104. Microdisk injection lasers

    BABA Toshihiko, FUJITA Masayuki, SAKAI Atsushi, YAMADA Hiroshi, KAMBARA Kohei

    OYOBUTURI　68　(12)　1353-1358　1999

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/oubutsu1932.68.1353 　

    ISSN： 0369-8009

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Research Projects 18

  1. 動的制御可能な高Q/Vテラヘルツ共振器の基盤研究

    近藤 裕佑, 冨士田 誠之, 柴田 一範, 山根 秀勝, 山田 義春, 村上 修一

    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: 地方独立行政法人大阪産業技術研究所

    2026/04/01 - 2029/03/31

  2. Breaking the operational limit of electronic device by revealing its hidden wave nature

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (S)

    Institution: Tokyo Institute of Technology

    2024/04/01 - 2029/03/31

  3. フレキシブルテラヘルツデバイスに向けたシリコン有効媒質材料の基盤研究 Competitive

    山根 秀勝, 冨士田 誠之, 山田 義春, 近藤 裕佑, 村上 修一

    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: 地方独立行政法人大阪産業技術研究所

    2024/04 - 2027/03

  4. 時空間分布制御テラヘルツ集積デバイスシステムの創成

    冨士田 誠之

    Offer Organization: 科学技術振興機構

    System: 戦略的創造研究推進事業 CREST

    Institution: 大阪大学

    2021/10 - 2027/03

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    本研究は情報担体として、電波と光の境界領域の未開拓周波数を有するテラヘルツ帯の電磁波であるテラヘルツ波に着目し、エレクトロニクスに量子効果とフォトニクスを融合することで、テラヘルツ波の時間発展と空間分布を制御する電子デバイスシステムの学理を追究し、大容量無線通信と高分解能センシングを可能とする革新的小型集積デバイスシステムの創成を目指します。

  5. トポロジカルフォトニック結晶のテラヘルツへの展開

    冨士田 誠之

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 基盤研究(A)

    Category: 基盤研究(A)

    Institution: 大阪大学

    2020/04/01 - 2024/03/31

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    本研究では，研究代表者らが世界に先駆けて開拓してきた世界最小損失のテラヘルツフォトニック結晶回路技術に物質科学に変革をもたらしているトポロジカルな性質を与えることで飛躍的な発展をはかり，テラヘルツ波を利用した通信やセンシングなどの応用を切り拓くことを目指している． <BR> トポロジカルフォトニック結晶の基本構造として，大小の三角空孔を六員環状に配置した構造を高い抵抗率を有するシリコンウエハへ形成した構造を用いた．120度と60度の急峻な曲げ構造を有する導波路および，曲げ構造がない直線導波路を作製し，エレクトロニクスに基づく高精度テラヘルツ分光システムで評価を行った．その結果，トポロジカルフォトニック結晶導波路の1回あたりの曲げ損失は0.1 dB以下であり，従来の円孔三角格子を形成したフォトニック結晶の0.2 dBよりも小さいトポロジカルな電磁波の伝搬に期待される結果が得られた．また，単位長さあたりの伝搬損失は0.015 dB/cmと見積もられ，これも従来のフォトニック結晶の0.04 dB/cmを下回った． <BR> このような極低損失導波路の通信応用の可能性を光電変換素子を用いたテラヘルツ通信システムで検証した．オンオフ変調方式を用いた場合，ビット誤り率10のマイナス11乗以下となるリアルタイムに映像伝送可能な実用上エラーフリーな通信データレートとして11 Gbit/sが得られ，曲げ導波路を含む従来のフォトニック結晶の1.5 Gbit/sを大きく更新した．また，非圧縮4K映像の無線伝送を行うことにも成功した．

  6. 共鳴トンネルダイオードとフォトニック結晶の融合によるテラヘルツ集積基盤技術の創成

    冨士田 誠之

    System: 戦略的創造研究推進事業 CREST

    Institution: 大阪大学

    2015/10 - 2021/09

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    本研究は、単体の電子デバイスとして最も高い周波数の電磁波を発生可能な共鳴トンネルダイオードに着目し、通信速度の限界を追究します。その物理限界を超えるため、共鳴トンネルダイオードと極低損失な集積プラットホームであるフォトニック結晶を融合させることで、電波と光波の間の未開拓の周波数を有するテラヘルツ電磁波を利活用した超高速かつ低消費電力な無線通信デバイスシステムの集積基盤技術を創成します。

  7. Development of ultralow loss photonic crystals at 1-THz band

    Fujita Masayuki

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: Osaka University

    2017/04/01 - 2020/03/31

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    The 1-THz frequency band corresponds to the upper limit of electronics operating speeds. One of the most critical issues in the 1-THz band is the large losses in conventional metal electronic circuits. In this study, 1-THz-band circuits based on metal-free silicon photonic crystals, which are dielectric microstructures with a periodic refractive index that is distributed on a scale comparable to the wavelength, were developed. The propagation losses are as low as 0.1 dB/cm at 1-THz band, which is one order of magnitude smaller than that of present metallic hollow waveguides. Error-free data transmission at a data rate of 1 Gbit/s using a developed waveguide is demonstrated, showing the promise of photonic crystals in the 1-THz band.

  8. 600-GHz-band Transceiver Technologies

    NAGATSUMA Tadao, FUJITA Masayuki, HISATAKE Shintaro

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Osaka University

    2016/04/01 - 2019/03/31

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    Terahertz (THz) communications research has recently become very active over the world to meet an urgent demand in high-speed wireless links. Carrier frequencies from 200 GHz to 400 GHz have been hot spots for researchers, mainly because of the availability of high-performance enabling devices for transmitters and receivers. One of the critical problems in the use of carrier frequencies of over 100 GHz is an atmospheric attenuation. There are three windows, where the attenuation becomes low and relatively flat over 100-GHz bandwidth; (I) 200 GHz-300 GHz, (II) 625 GHz-725 GHz, (III) 800 GHz-900 GHz. This study aimed at an exploration of the band (II) as the next center stage of THz communications research, developing wideband transmitters based on photonics and highly-sensitive receivers using homodyne and heterodyne detection, and successfully achieved a record data rate of over 12.5 Gbit/s up to 720 GHz.

  9. Ultrahigh sensitivity terahertz sensing by photonic crystal cavity

    Fujita Masayuki, NAGATSUMA TADAO

    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: Osaka University

    2015/04/01 - 2017/03/31

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    We studied photonic crystal microcavity for ultrahigh sensitivity sensing using terahertz wave with frequency located between the radio and light waves. We fabricated the cavity with a Q factor of approximately 10,000 in the 0.3 THz band from high resistivity silicon wafer using microfabrication technology. As a test bed for the sensing application, we successfully detected a change in the resonant spectrum of the cavity when a dielectric film with a thickness smaller than 1/100 of the wavelength was attached to the surface of the cavity.

  10. A Terahertz Tag Using Photonic Crystal Slabs

    Nagatsuma Tadao, FUJITA MASAYUKI

    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: Osaka University

    2015/04/01 - 2017/03/31

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    We propose a novel terahertz (THz) tag as future tags for Internet of Everything (IoE), which can be secure, compact and packaged inside objects. In contrast to previous THz tags, which have a maximum capacity of 27 bits per square centimeters, we introduce two dimensional (2D) photonic-crystal slabs in order to increase the capacity by encoding an information in both space and frequency domains. We have designed, fabricated and successfully demonstrated THz tags with a capacity of 48 bits per square centimeters in the 600-GHz band.

  11. Terahertz planar circuits based on photonic crystal

    Fujita Masayuki, NAGATSUMA TADAO

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Osaka University

    2014/04/01 - 2017/03/31

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    We focused on a photonic crystal slab as technology platform for the integration of terahertz devices, such as planar circuits, with operating frequency located between the radio and light waves. We investigated the low loss of terahertz waveguides using a photonic crystal slab, and achieved a loss of 0.04 dB/cm in the 0.3 THz band. We also demonstrated a compact diplexer using a directional coupler based on photonic crystal waveguides. Then, we fabricated a prototype of a terahertz integrated circuit using the photonic crystal platform for frequency division wireless communication, which consists of the diplexer, a grating coupler as input-output wireless interface, and resonant tunneling diodes. Finally, we discussed the operating bandwidth of terahertz photonic crystal devices.

  12. Photonic crystal terahertz-wave absorbers

    FUJITA Masayuki, NAGATSUMA Tadao

    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: Osaka University

    2012/04/01 - 2014/03/31

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    Terahertz (THz) waves, which are located in the region between radio and light waves (0.1 THz - 10 THz), have attracted a great deal of interest in various fields. The highly-efficient THz perfect absorbers have attracted much attention recently due not only to scientific interest but also to various possible applications. However, thin, planar THz-wave absorbers with near perfect absorptivity and sufficiently broad bandwidth have not yet been demonstrated. Here we utilize the in-plane resonance of a thin, planar photonic-crystal slab with negligible absorption loss to successfully demonstrate and visualize THz-wave trapping. We artificially introduce free carriers, which interact with the trapped waves and capture them in the slab by absorption. Our system exhibits an experimental absorptivity (interaction efficiency) of > 99 % and a broad bandwidth (absorptivity >= 90 %) that covers 17 % of the centre frequency.

  13. Study on photonic-crystal effects on photovoltaic materials towards efficient photovoltaic devices

    FUJITA Masayuki

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (A)

    Category: Grant-in-Aid for Young Scientists (A)

    Institution: Osaka University

    2011/04/01 - 2014/03/31

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    We demonstrate an enhancement of the optical absorption and photoelectric-conversion efficiency of an ultrathin (50 nm) silicon active-layer photodetecting device using a two-dimensional photonic crystal. We show both experimentally and with simulations that the incident-light absorption within the active layer is enhanced by optical-resonance effects at the photonic band edge. We also find that a photonic crystal with deeper holes can lead to an even larger absorption enhancement due to better Q-factor matching between the photonic band-edge modes and the intrinsic material absorption. The experimentally observed photocurrent of the fabricated photonic crystal sample is increased by a factor of around 20 at the photonic band-edge wavelength relative to that of a control sample without the photonic crystal which is attributed to the improved Q matching. We also investigate broadband optical absorption enhancement in thin silicon photovoltaic devices by photonic crystal.

  14. Effects of a photonic nanostructure on light emission of silicon

    FUJITA Masayuki

    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: Kyoto University

    2008 - 2010

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    We have introduced a photonic crystal (PC) into a silicon (Si) slab to manipulate the light emission. Our study demonstrates that the light extraction is improved by a factor of ~50 in a defect-free PC. In addition, introducing a nanocavity into the PC can enhance the emission by up to a factor of ～300 by improving also the objective coupling and the internal quantum efficiencies. We also found that phonon accumulation in the tiny space will be a key for enhanced light emission in addition to the cavity effect for photons. Finally, we propose and demonstrate the application of high-pressure water vapor annealing (HWA) to Si PC nanocavities for surface passivation. We found that HWA boosts light emission due to the reduction of surface recombination beyond simply using the cavity effect.

  15. フォトニックバンドギャップ環境による量子ドットの物性の解明

    冨士田 誠之

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 若手研究(スタートアップ)

    Category: 若手研究(スタートアップ)

    Institution: 京都大学

    2006 - 2007

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    本研究は,発光現象の根本的な制御が可能なフォトニック結晶を用いることで,量子ドットの発光状態を制御し,その結果観察される発光現象を通して,量子ドットの遷移・緩和現象を明らかすることを目的としている.量子ドットは理想的には三次元的な電子の閉じこめ状態が形成されるため,個々には独立しており,量子ドット間の電子のやり取りは存在しないと考えられる.しかし,本研究で取り扱う自己形成量子ドットでは,濡れ層と呼ばれる各量子ドット間を空間的に連続的に接続する量子薄膜層が存在し,その濡れ層を介した量子ドット間の電子のやり取りが存在する可能性がある.量子ドット間の電子のやり取りがある場合,例えばある量子ドットの発光減衰寿命が速ければその量子ドットへ優先的に電子が遷移するはずである.ここで,量子ドットへ点欠陥を導入した場合には欠陥部分がナノ共振器として働き,欠陥のない部分と比較して発光減衰寿命が速くなると考えられる.さらにはナノ共振器に組み込まれた個々の量子ドットの発光減衰寿命は量子ドットの位置・エネルギーに応じて変化するはずであり,量子ドット間の電子のやり取りの有無で共振器全体としての発光効率が変化すると予想される.ランダムな分布をもつ量子ドットをナノ共振器に複数導入した状況の発光効率を解析したところ,量子ドット間の電子のやり取りがない場合には発光効率の統計分布は量子ドットの個数が増えるにつれ,約0.2へ集中していった.一方,電子のやり取りがある場合には発光減衰寿命が速い量子ドットへ電子が優先的に遷移する効果で0.8以上の発光効率が期待されることが判明した.環境温度を上昇させることで量子ドット間の電子のやりとりが増大し,結果,発光効率も増大すると予想されるが,130Kにおける発光強度が3Kにおける発光強度を上回るという,上記予想を支持する実験結果が得られた.

  16. フォトニック結晶レーザの高性能化と新機能探求

    冨士田 誠之

    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: 京都大学

    2003 - 2005

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    従来にはない光の制御を可能にするナノ構造光機能材料として注目を集めているフォトニック結晶を用いたレーザの高性能化および新機能の探求を本研究の目的としている.フォトニック結晶の高性能化にはまず,高精度な微細加工の確立が必要と考えた.昨年度までに,一般的にレーザに用いられる化合物半導体に対し,高純度ヨウ化水素ガスを用いた誘導結合プラズマ法を適応することで,既に加工技術が確立されているシリコンフォトニック結晶に迫る高精度なフォトニック結晶の作製に成功した.今年度はこの技術をフォトニック結晶レーザの基本形となる薄膜スラブにガリウムインジウムヒ素燐半導体量子井戸発光層を導入した構造に適用することを試みた.作製したフォトニック結晶を,チタンサファイアパルスレーザで励起し,光電子増倍管を含む光学システムにて発光の時間応答特性を測定した.量子井戸からの発光の減衰寿命がフォトニック結晶のない場合と比較して約5倍に増大した.これは,フォトニック結晶の効果によってレーザ発振現象の源となる自然放出が原理的に制御された結果を示しており,高精度な化合物半導体加工結果を反映している.(この成果はフォトニック結晶による発光制御の基本原理が実証された成果として米国の著名な科学誌サイエンスに掲載され,多くのメディアでも報道された)本研究では一方でフォトニック結晶レーザの新機能探求の目的で新たな発光材料を用いたフォトニック結晶発光素子の作製も試みている.今年度は昨年度に引き続きフレキシブルな大面積素子への展開の可能性がある有機材料を用いた.ナノインプリント法という大面積を一括形成可能な微細加工技術を適応することで約1億個の微細孔からなるフォトニック結晶を作製した.2ミリ角という大きな発光面積フォトニック結晶有機発光素子の動作を確認し,将来の大面積有機フォトニック結晶レーザの作製技術の基礎を築いた.

  17. ULTIMATE LOW THRESHOLD AND LARGE SCALE INTEGRATION OF SEMICONDUCTOR MICRODISK LASERS

    BABA Toshihiko, INOSHITA Kyoji, FUJITA Masayuki, SAKAI Atsushi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: YOKOHAMA NATIONAL UNIVERSITY

    2001 - 2003

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    In this study, we investigated the size reduction, threshold reduction, and the realization of the spontaneous emission control such as Purcell effect in microdisk semiconductor lasers, and their high integration and the formation for photonic molecule. First, we achieved the room temperature continuous wave operation of GaInAsP device by photopumping. The smallest diameter of the device was 1.7 microns, which is the same as the smallest record of this device. In addition, the lowest threshold was as low as 19 microns, which is the lowest record for GaInAsP lasers. We also integrated the metal electrode and observed the current injection lasing. In this experiment, an athermal effect in the polyimide cladding layer was discovered, which stabilizes the lasing wavelength. Then, we proposed a microgear cavity having a rotationally symmetric grating along the periphery of the microdisk. We theoretically found that the gear shape essentially improves the cavity Q factor. Actually, we successfully reduced the threshold to 14 microwatts. The spontaneous emission factor of these devices were evaluated to be over 0.1, which is close to the large Purcell factor of 6.7 was 0.1 micros to form a photonic molecule. A unique mode splitting, anti-crossing characteristics, miniband formation and bistable characteristics were observed for the photonic molecule, which are promising for future functional photonic circuits and photonic memories.

  18. ディスクレーザの極限微小化と自然放出制御

    冨士田 誠之

    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: 横浜国立大学

    1999 - 2001

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