東北大学研究者紹介

研究者詳細

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顔写真

リン　ソウタク

林　宗澤

Tsung Tse Lin

所属

電気通信研究所　情報通信基盤研究部門　超ブロードバンド信号処理研究室

職名

准教授

学位

博士（工学）（東北大学）
修士（電子工程）（国立交通大学）

researchmap

https://researchmap.jp/ttlin

J-GLOBAL ID

202201002068140955

e-Rad 研究者番号

40585155

ORCID

https://orcid.org/0000-0002-4951-1202

学歴 1

東北大学　大学院工学研究科

委員歴 3

IRMMW-THz 2027 LOC
TeraTech2023 LOC
レーザー学会学術講演会第41回年次大会プログラム委員会委員

受賞 1

桜舞賞研究奨励賞

2019年3月　理化学研究所

論文 59

Enhanced surface emission in terahertz quantum cascade lasers using plasma layer assisted photonic crystal waveguides 査読有り

Mingxi Chen, Tsung-Tse Lin, Li Wang, Hideki Hirayama, Chiko Otani

Frontiers in Photonics　6　2025年6月18日
出版者・発行元： Frontiers Media SA
DOI： 10.3389/fphot.2025.1614809 　

eISSN：2673-6853

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Introduction: Surface-emitting terahertz quantum cascade lasers (THz QCLs) are highly promising for applications requiring high-quality far-field beams and controlled beam divergence. However, limited brightness and output power in conventional surface-emitting designs remain significant barriers to practical implementation. Although photonic crystal structures and distributed Bragg reflectors have been explored to enhance surface emission, intrinsic limitations in emission area scaling and brightness improvement persist. Thus, new strategies are essential to advance the performance of surface-emitting THz QCLs. Methods: This study proposes a plasma-assisted photonic crystal waveguide design to improve surface emission efficiency in THz QCLs. A three-dimensional TM-mode coupled wave theory (3D TM-mode CWT) model was developed, incorporating effective permittivity enhancement and a self-consistent iterative scheme to accurately simulate optical field distribution and interaction within the structure. Results: Simulations reveal that the introduction of a plasma layer effectively disrupts the optical field symmetry characteristic of conventional double-metal waveguides, promoting vertical emission. Through systematic optimization, a plasma layer thickness of 0.8 μm was identified as having the potential to achieve surface emission efficiencies exceeding those of conventional structures by over two orders of magnitude. This enhancement is realized without significantly increasing fabrication complexity. Discussion: The plasma-assisted photonic crystal waveguide design offers a viable pathway toward realizing high-brightness surface-emitting THz QCLs. Although challenges such as material growth control and thermal management remain, the substantial improvement in surface emission efficiency underscores the potential of this approach for future high-performance terahertz applications.
Terahertz quantum cascade lasers employing convex phonon well 査読有り

Li Wang, Tsung-Tse Lin, Ke Wang, Hideki Hirayama

Optics Express　33　(7)　15292-15292　2025年3月27日
出版者・発行元： Optica Publishing Group
DOI： 10.1364/oe.553935 　

eISSN：1094-4087

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The 3-level resonant-phonon scheme, a predominant approach for achieving high-temperature operation in terahertz quantum cascade lasers, has recently gained conspicuous progress by purifying the lasing of relevant quantum levels from nonrelevant ones. However, as this 3-level system typically relies on a module architecture with only two quantum wells, the engineering flexibility is limited; for instance, the transparency of injector barriers for the resonant tunneling process is sacrificed to balance the trade-offs between injection selectivity and parasitic leakages through nonrelevant levels. This study presents the convex phonon well concept to expand engineering possibilities for levels of purification. The effectiveness of this concept is initially confirmed by observing lasing at 201 K in experiments.
Molecular beam epitaxial growth and physical properties of AlN/GaN superlattices with an average 50% Al composition 査読有り

Siqi Li, Pengfei Shao, Xiao Liang, Songlin Chen, Zhenhua Li, Xujun Su, Tao Tao, Zili Xie, Bin Liu, M. Ajmal Khan, Li Wang, T. T. Lin, Hideki Hirayama, Rong Zhang, Ke Wang

Chinese Physics B　33　(12)　126801-126801　2024年12月1日
出版者・発行元： IOP Publishing
DOI： 10.1088/1674-1056/ad84cc 　

ISSN：1674-1056

eISSN：2058-3834

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Abstract We report molecular beam epitaxial growth and electrical and ultraviolet light emitting properties of (AlN)m/(GaN)n superlattices (SLs), where m and n represent the numbers of monolayers. Clear satellite peaks observed in XRD 2θ–ω scans and TEM images evidence the formation of clear periodicity and atomically sharp interfaces. For (AlN)m/(GaN)n SLs with an average Al composition of 50%, we have obtained an electron density up to 4.48 × 10¹⁹ cm⁻³ and a resistivity of 0.002 Ω⋅cm, and a hole density of 1.83 × 10¹⁸ cm⁻³ with a resistivity of 3.722 Ω⋅cm, both at room temperature. Furthermore, the (AlN)m/(GaN)n SLs exhibit a blue shift for their photoluminescence peaks, from 403 nm to 318 nm as GaN is reduced from n = 11 to n = 4 MLs, reaching the challenging UVB wavelength range. The results demonstrate that the (AlN)m/(GaN)n SLs have the potential to enhance the conductivity and avoid the usual random alloy scattering of the high-Al-composition ternary AlGaN, making them promising functional components in both UVB emitter and AlGaN channel high electron mobility transistor applications.
Monolayer-scale AlN/GaN digital alloys grown by plasma-assisted molecular beam epitaxy 査読有り

Siqi Li, Xiao Liang, Pengfei Shao, Songlin Chen, Zhenhua Li, Xujun Su, Tao Tao, Zili Xie, M. Ajmal Khan, Li Wang, T. T. Lin, Hideki Hirayama, Bin Liu, Dunjun Chen, Ke Wang, Rong Zhang

Applied Physics Letters　125　(11)　2024年9月9日
出版者・発行元： AIP Publishing
DOI： 10.1063/5.0215886 　

ISSN：0003-6951

eISSN：1077-3118

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The efficiency of usual AlGaN based deep ultraviolet light-emitting devices is still quite low. The difficulties are basically originated from the fundamental material properties of AlGaN. This work has adopted monolayer-scale (AlN)m/(GaN)n ordered digital alloys (DAs) as alternatives to AlGaN random alloys, m and n are the numbers of monolayers. X-ray diffraction scans have demonstrated clear satellite peaks, verifying good periodicity of AlN/GaN DAs grown by molecular beam epitaxy (MBE), and transmission electron microscopy results have revealed atomically sharp and smooth interfaces and quite precise m:n values agreeing well with designs. The electron densities of Si-doped (AlN)m/(GaN)n DAs with high equivalent Al compositions are significantly higher than those of conventional AlGaN:Si random alloys grown in the same MBE system. Si dopant ionization energies in DAs are only 2–5 meV, much lower than that for usual random alloys. The red shift of the light emission for DAs with thinner AlN barriers has suggested strong coupling between the GaN wells and thus formation of a miniband in a vertical direction. The results have demonstrated the potential of the (AlN)m/(GaN)n DAs as electronically functional alternatives for various device applications.
Photoresponse Linearity and Speed of an InP-Based Asymmetric-Dual-Grating-Gate HEMT Plasmonic Detector with Respect to Incident THz Radiation Intensity

M. Nagatsu, K. Narita, Y. Takida, H. Minamide, T.-T. Lin, T. Suemitsu, T. Otsuji, A. Satou

2024 49th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)　1-2　2024年9月1日
出版者・発行元： IEEE
DOI： 10.1109/irmmw-thz60956.2024.10697615 　
300-GHz-Band Operation of UTC-PD-Integrated HEMT Photonic Double-Mixer

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

2024 49th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)　1-2　2024年9月1日
出版者・発行元： IEEE
DOI： 10.1109/irmmw-thz60956.2024.10697824 　
A fast and sensitive THz rectenna detector working with zero-bias based on the 2D Dirac-Semimetal/Insulator heterostructure

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

JSAP-Optica Joint Symposia 2024 Abstracts　18p_B2_3-18p_B2_3　2024年
出版者・発行元： Optica Publishing Group
DOI： 10.1364/jsapo.2024.18p_b2_3 　

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

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

Device Research Conference - Conference Digest, DRC　2024年

DOI： 10.1109/DRC61706.2024.10605270 　

ISSN：1548-3770
Fast and Sensitive Terahertz Detection Based on Novel Insulator/Dirac-Semimetal Heterostructures

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

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

DOI： 10.1109/IRMMW-THz60956.2024.10697591 　

ISSN：2162-2027

eISSN：2162-2035
Synthesis of Bi2Se3 and its application to sensitive and fast THz detection

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

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

DOI： 10.1117/12.3028676 　

ISSN：0277-786X

eISSN：1996-756X
Gate-readout and a 3D rectification effect for giant responsivity enhancement of asymmetric dual-grating-gate plasmonic terahertz detectors 査読有り

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

Nanophotonics　12　(23)　4283-4295　2023年11月2日
出版者・発行元： Walter de Gruyter GmbH
DOI： 10.1515/nanoph-2023-0256 　

ISSN：2192-8606

eISSN：2192-8614

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

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

2023 International Topical Meeting on Microwave Photonics (MWP)　1-4　2023年10月15日
出版者・発行元： IEEE
DOI： 10.1109/mwp58203.2023.10416637 　
Utilizing High-Intensity Optical Subcarrier Signal for Conversion Gain Enhancement of a UTC-PD-Integrated HEMT Photonic Double-Mixer 国際誌招待有り査読有り

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

2023 48th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)　1　(1)　1-2　2023年9月17日
出版者・発行元： IEEE
DOI： 10.1109/irmmw-thz57677.2023.10299383 　
Interdiffusion limiting on self-consistent optical gain in terahertz quantum cascade lasers 査読有り

Li Wang, Mingxi Chen, Tsung-Tse Lin, Ke Wang, Hideki Hirayama

Applied Physics Express　16　(7)　072004-072004　2023年7月1日
出版者・発行元： IOP Publishing
DOI： 10.35848/1882-0786/ace3a4 　

ISSN：1882-0778

eISSN：1882-0786

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Abstract In this study, the physical picture of imperfect interfaces is characterized by two terms of in-plane roughness and out-plane interdiffusion. The corresponding scattering is quantified using the nonequilibrium Green’s function model by setting an additional self-energy, and then the impact of scattering strength on GaAs/Al_0.3Ga_0.7As 2-well terahertz quantum cascade laser performance is investigated. It shows that the interdiffusion scattering term can lead to a maximum reduction of approximately 30% in self-consistent optical gain at a temperature of 300 K. The decrease of population inversion, rather than the broadening linewidth of radiation transition, is the primary factor contributing to the gain degradation. By excluding the effect of band structure deformation caused by interdiffusion in advance, the main cause for the reduction in population inversion is identified as the decoherence of resonant-tunneling injection resulting from interdiffusion scattering.
Clean three-level direct-phonon injection terahertz quantum cascade laser 査読有り

Li Wang, Tsung-Tse Lin, Ke Wang, Hideki Hirayama

Applied Physics Letters　122　(22)　221103　2023年5月29日
出版者・発行元： AIP Publishing
DOI： 10.1063/5.0138948 　

ISSN：0003-6951

eISSN：1077-3118

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For terahertz quantum cascade lasers employing the nonalignment injection scheme via direct-phonon resonance, this study presents the crucial effect of parasitic absorption in the narrow module architecture based on only two quantum wells. The optical gain can be restricted to small (or negative) values even at the low temperature. To address this issue, a suppression strategy by increasing the injection energy is used to isolate the relevant levels. The feasibility of this strategy is experimentally demonstrated by observing lasing at 194 K.
Terahertz quantum cascade laser considering compositional interdiffusion effect 査読有り

Li Wang, Tsung-Tse Lin, Mingxi Chen, Ke Wang, Hideki Hirayama

Applied Physics Express　16　(3)　032007-032007　2023年3月31日
出版者・発行元： IOP Publishing
DOI： 10.35848/1882-0786/acc568 　

ISSN：1882-0778

eISSN：1882-0786

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Abstract This study presents an experimental demonstration of the crucial role of compositional interdiffusion at interfaces in GaAs/AlGaAs alternating superlattices for developing the terahertz quantum cascade lasers operating at high temperatures. By growing GaAs/Al_0.3Ga_0.7As superlattices using the molecular beam epitaxy technique, an aluminum interdiffusion width of 0.95 nm (equivalent to ∼3.4 monolayers) is estimated. Incorporating this interdiffusion width as an additional design parameter has resulted in a 20 K improvement in the maximum operating temperature of the laser. To quantify the magnitude of the interdiffusion scattering effects on electron dynamics, an independent self-energy that functions based on the axial correlation length is introduced in the non-equilibrium Green’s function model. It clarifies that changes in the lifetime of quantum states and also the population fractions are primarily influenced by the deformation of wave functions at the injector when the interfaces become interdiffused.
Doping study of two-well resonant-phonon terahertz quantum cascade lasers part I: doping profile dependence 査読有り

Teppei Miyoshi, Kai Xi (Cathy) Wang, Tsung-Tse Lin

Japanese Journal of Applied Physics　62　(3)　032002-032002　2023年3月21日
出版者・発行元： IOP Publishing
DOI： 10.35848/1347-4065/acbdd8 　

ISSN：0021-4922

eISSN：1347-4065

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Abstract The influence of impurity doping on GaAs-based two-well resonant-phonon terahertz quantum cascade lasers is investigated theoretically, and efficient doping schemes are discussed. By using the rate equation model, the impacts of dopant amount, position, and distribution on the performance of a high-performance device is simulated focusing on a single module. The calculated optical gain is found to have a peak over the range of sheet doping density from 1.0 × 10¹⁰ to 1.0 × 10¹²cm⁻² in all eight doping conditions examined in this work. Among these patterns, the devices with the undoped condition and homogeneous-doping in phonon-wells mark high optical gain, and the latter is also resistant against the detuning of subband alignment due to band-bending under the high doping conditions. Furthermore, based on the simulation results, a modulation doping scheme whose active cores include both doped and undoped modules is suggested and discussed.
M-plane GaN terahertz quantum cascade laser structure design and doping effect for resonant-phonon and phonon-scattering-injection schemes

Ye, F., Wang, Y., Wang, L., Lin, T.-T., Zeng, F., Ji, Y., Zhang, J., Liu, F., Hirayama, H., Wang, K., Shi, Y., Zheng, Y., Zhang, R.

Scientific Reports　13　(1)　2023年

DOI： 10.1038/s41598-023-38627-3 　

ISSN：2045-2322
Conversion Gain Enhancement of a UTC-PD-Integrated HEMT Photonic Double-Mixer by High-Intensity Optical Subcarrier Signal

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

Optical Fiber Communication Conference (OFC) 2023　2023年
出版者・発行元： Optica Publishing Group
DOI： 10.1364/ofc.2023.m3d.7 　

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We experimentally investigate the effect of high-intensity subcarrier signal input to the UTC-PD-integrated HEMT working for optical-to-wireless carrier frequency down-conversion on enhancement of its double-mixing conversion gain. The fabricated UTC-PD-integrated HEMT demonstrated the linear increase in the conversion gain by up to +7 dB with increasing the subcarrier signal intensity without saturation, and the conversion gain enhancement of +6.8 dB from -51.0 dB to -44.2 dB was achieved.
Optical gain reduction caused by nonrelevant subbands in narrow-period terahertz quantum cascade laser designs 査読有り

Li Wang, Tsung-Tse Lin, Ke Wang, Hideki Hirayama

Scientific Reports　12　(1)　22228　2022年12月23日
出版者・発行元： Springer Science and Business Media {LLC}
DOI： 10.1038/s41598-022-25139-9 　

ISSN：2045-2322

eISSN：2045-2322

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Abstract The recent designs of terahertz quantum cascade lasers usually employ the short periodic length and also the tall barriers for high-temperature operation. In this work, the effect of high-energy lying non-relevant subbands is studied based on nonequilibrium Green’s function formalisms model, demonstrating those subbands are probable to play a minor role on the population inversion, but play a major role on the optical gain at high temperatures. The phenomenon can be ascribed to the appearance of leakages crossing neighboring periods via sequential resonant tunneling, and those leakages are inherently created by the specific features of the two-well configuration in this design that the phonon well should be wide enough for performing the phonon scattering to depopulate the lower-laser subband. The narrower periodic length design can strengthen this inter-period leakage. A parasitic absorption between the first high-lying nonrelevant subbands from two laser wells can closely overlap the gain shape and thus significantly reduce the peak gain.
Increasing the output power of a heavily doped terahertz quantum cascade laser by avoiding the subband misalignment 査読有り

Tsung-Tse Lin, Li Wang, Ke Wang, Thomas Grange, Stefan Birner, Teppei Miyoshi, Hideki Hirayama

Journal of Applied Physics　132　(17)　173101-173101　2022年11月7日
出版者・発行元： {AIP} Publishing
DOI： 10.1063/5.0106751 　

ISSN：0021-8979 1089-7550

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<jats:p> A significant enhancement in the output power of a GaAs-based terahertz quantum cascade laser (THz QCL) was achieved by implementing a relatively high impurity doping concentration. The QC structure was precisely designed using the nonequilibrium green function method by considering the band bending effect caused by a higher doping concentration. This enabled us to avoid the subband misalignment induced by the strong band bending effect, to provide efficient carrier transport even at high doping concentrations, and to improve the output power. The maximum output power of a GaAs/Al<jats:sub>0.16</jats:sub>Ga<jats:sub>0.84</jats:sub>As 3.5 THz-band QCL at 10 K was enhanced from 390 to 600 mW by increasing the doping concentration at the depopulation layers from 6 × 10<jats:sup>16</jats:sup> to 1.2 × 10<jats:sup>17</jats:sup> cm<jats:sup>−3</jats:sup>. The average power of 21 mW was achieved by implementing the appropriate pulse drive conditions. </jats:p>
Nonrelevant quantum levels effecting on the current in 2-well terahertz quantum cascade lasers 査読有り

Li Wang, Tsung-Tse Lin, Ke Wang, Hideki Hirayama

Scientific Reports　12　(1)　17378　2022年10月17日
出版者・発行元： Springer Science and Business Media {LLC}
DOI： 10.1038/s41598-022-22396-6 　

ISSN：2045-2322

eISSN：2045-2322

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Abstract Recent renewed operating temperatures in terahertz quantum cascade lasers emphasize on narrowing the periodic length in a 2-well resonant-phonon design for a clean quantum level structure, in which the depopulation energy is significantly higher than one longitudinal phonon. In this study, various depopulation energies (small and large) are engineered in a 2-well design; the effect of the high-lying nonrelevant levels on the currents are systematically studied by using the non-equilibrium Green’s function method. The engineering of the depopulation energy is unable to avoid the formation of leakage channels, which are activated within at least three neighboring periods via sequential close tunneling. However, a large depopulation energy relaxes the thermal backfilling process; as a result, the net leakages at high temperatures can be significantly suppressed. In addition, pre-alignment remains a critical issue in the design when using a large depopulation energy, which requires improved engineering for the barriers to obtain better laser dynamics.
Room-temperature optical gain in terahertz quantum cascade lasers based on GaAs/AlGaAs, GaN/AlGaN, ZnO/ZnMgO

Li Wang, Tsung-Tse Lin, Thomas Grange, Ke Wang, Hideki Hirayama

2022 28th International Semiconductor Laser Conference (ISLC)　2022年10月16日
出版者・発行元： IEEE
DOI： 10.23919/islc52947.2022.9943321 　
1.39- Watt Operation of THz Quantum Cascade Laser with Highly Doped Depopulation Layers

Tsung-Tse Lin, Li Wang, Ke Wang, Thomas Grange, Stefan Birner, Hideki Hirayama

2022 28th International Semiconductor Laser Conference (ISLC)　2022年10月16日
出版者・発行元： IEEE
DOI： 10.23919/islc52947.2022.9943475 　
Nonrelevant quantum levels limited laser dynamic in narrow-period terahertz quantum cascade lasers 査読有り

Li Wang, Tsung-Tse Lin, Ke Wang, Hideki Hirayama

Japanese Journal of Applied Physics　61　(10)　102003-102003　2022年10月1日
出版者・発行元： {IOP} Publishing
DOI： 10.35848/1347-4065/ac8c0e 　

ISSN：0021-4922 1347-4065

eISSN：1347-4065

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Abstract The fundamental challenges faced by terahertz quantum cascade lasers are the operations below room temperature, and the recent improved operating temperatures are actually based on the narrow-period designs (2-well resonant-phonon scheme). In this study, we address the critical effect of nonrelevant high-confined quantum levels on the laser threshold current in such designs, i.e. at high temperatures, the resonant-tunneling channels passing through neighboring periods via those levels can dominantly increase the laser threshold current. As a result, the laser dynamics significantly shrink to zero even at 270 K. The channels cannot be easily eliminated as they are derived from the specific configuration of a two-quantum-well periodic structure, in which the width of the period is narrow, and the nonrelevant levels from the lower-well are confined down in energy. It is reasonable to suppress the current flowing across those levels by narrowing the lower-well further, but an appropriate balance of its thickness is essential.
Step-flow growth of Al droplet free AlN epilayers grown by plasma assisted molecular beam epitaxy 査読有り

Pengfei Shao, Siqi Li, Zhenhua Li, Hui Zhou, Dongqi Zhang, Tao Tao, Yu Yan, Zili Xie, Ke Wang, Dunjun Chen, Bin Liu, Youdou Zheng, Rong Zhang, Tsungtse Lin, Li Wang, Hideki Hirayama

Journal of Physics D: Applied Physics　55　(36)　364002-364002　2022年9月8日
出版者・発行元： {IOP} Publishing
DOI： 10.1088/1361-6463/ac79dd 　

ISSN：0022-3727 1361-6463

eISSN：1361-6463

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Abstract We have investigated an Al modulation epitaxy (AME) method to obtain step-flow growth of Al droplet free AlN layers by plasma assisted molecular beam epitaxy (MBE). At the usual growth temperature of (Al)GaN/AlN heterostructures, Al atom migration and desorption rate are very low and consequently it is very difficult to avoid the formation of Al droplets on AlN growth front by conventional MBE growth method. By adopting the AME growth method, such a difficulty has been effectively overcome and step flow growth mode of AlN has been clearly observed. By optimizing the AME growth time sequence, namely, AlN growth time and N radical beam treatment time, Al droplet free AlN layers with step flow growth characteristics have been obtained, with atomic flat surfaces and an average atomic step width of ∼118 nm at 970 °C–1000 °C, which is still suitable to grow (Al)GaN/AlN heterostructures by MBE.
High Doping Concentration and Variable Al Composition THz Quantum Cascade Lasers with 1.39-Watt Operation

Tsung-Tse Lin, Li Wang, Ke Wang, Thomas Grange, Stefan Birner, Hideki Hirayama

2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)　2022年8月28日
出版者・発行元： IEEE
DOI： 10.1109/irmmw-thz50927.2022.9895547 　
Over One Watt Output Power Terahertz Quantum Cascade Lasers by Using High Doping Concentration and Variable Barrier‐Well Height 査読有り

Tsung-Tse Lin, Li Wang, Ke Wang, Thomas Grange, Stefan Birner, Hideki Hirayama

physica status solidi (RRL) – Rapid Research Letters　16　(7)　2200033-2200033　2022年7月
出版者・発行元： Wiley
DOI： 10.1002/pssr.202200033 　

ISSN：1862-6254 1862-6270

eISSN：1862-6270
Surface-emitting photonic crystal terahertz quantum cascade laser adopting uniform triangular prism photonic crystal with a double-metal waveguide 査読有り

Joosun Yun, Tsung-Tse Lin, Hideki Hirayama

Japanese Journal of Applied Physics　61　(6)　062001-062001　2022年6月1日
出版者・発行元： {IOP} Publishing
DOI： 10.35848/1347-4065/ac5a00 　

ISSN：0021-4922 1347-4065

eISSN：1347-4065

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Abstract Herein, we investigate surface-emitting photonic crystal terahertz quantum cascade lasers adopting double metal waveguide for high light extraction efficiency by utilizing finite-difference time-domain and filter diagonalization method. For the ease of fabrication and scalability of beam power, only a typical uniform 2D unit cell with triangular lattice and connected metal electrodes are considered in this study. Cylinder or uniform triangular prism photonic crystals are adopted as resonators within the selected unit cell structure. Candidate ${\rm{\Gamma } }$-point modes for efficient surface-normal emission are searched based on the unit cell analysis as a first step. After that, far-field, field distribution, and light-extraction efficiency are calculated to verify the candidate modes’ suitability by deploying 15(16) × 15 unit cells. Extracted results show that the surface-emitting quantum cascade lasers with triangular prism photonic crystal slabs have the possibility to attain high light-extraction efficiency with Gaussian beam shape even with compact chip size and high active region occupancy.
Limitation of parasitic absorption in designs of three-state terahertz quantum cascade lasers with direct-phonon injection 査読有り

Li Wang, Tsung-Tse Lin, Ke Wang, Hideki Hirayama

Applied Physics Express　15　(5)　052002-052002　2022年5月1日
出版者・発行元： {IOP} Publishing
DOI： 10.35848/1882-0786/ac4e26 　

ISSN：1882-0778 1882-0786

eISSN：1882-0786

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Abstract To maximize the population inversion in terahertz quantum cascade lasers for high-temperature operation, the scheme of electron injection following direct-phonon emission is more attractive than the common way via resonant tunneling. If this direct-phonon injection can be realized within a simple quantum structure (only three quantum states), much higher optical gain is expected even at room temperature. However, the attempts of this design in experiments are full of challenges. In this work, the non-equilibrium Green’s function method is introduced to draw a full picture of the quantum transport in this design. It demonstrates that the optical gain is strictly limited by a parasitic absorption from one specific high-lying state. Moreover, a strategy is proposed to avoid this limitation.
Over 1 Watt THz QCLs with high doping concentration and variable Al composition in active structure

Tsung-Tse Lin, Li Wang, Ke Wang, Thomas Grange, Stefan Birner, Hideki Hirayama

Conference on Lasers and Electro-Optics　2022年
出版者・発行元： Optica Publishing Group
DOI： 10.1364/cleo_si.2022.ss2d.6 　

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A 1.31 W peak power and 52 mW average power THz QCL is presented by variable Al composition active structure with high doping concentration based on NEGF method design. Device has thick growth active layers and large mesa size with the consideration of heat dissipation.
Leakages suppression by isolating the desired quantum levels for high-temperature terahertz quantum cascade lasers 査読有り

Li Wang, Tsung-Tse Lin, Mingxi Chen, Ke Wang, Hideki Hirayama

Scientific Reports　11　(1)　23634　2021年12月
出版者・発行元： Springer Science and Business Media {LLC}
DOI： 10.1038/s41598-021-02301-3 　

ISSN：2045-2322

eISSN：2045-2322

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Abstract The key challenge for terahertz quantum cascade lasers (THz-QCLs) is to make it operating at room-temperature. The suppression of thermally activated leakages via high lying quantum levels is emphasized recently. In this study, we employ the advanced self-consistent method of non-equilibrium Green’s function, aiming to reveal those kinds of leakages in the commonly used THz-QCL designs based on 2-, 3- and 4-quantum well. At the high temperature of 300 K, if all the confined high lying quantum levels and also the continuums are included within three neighboring periods, leakages indeed possess high fraction of the total current (21%, 30%, 50% for 2-, 3- and 4-quantum well designs, respectively). Ministep concept is introduced to weaken those leakage channels by isolating the desired levels from high lying ones, thus the leakages are well suppressed, with corresponding fractions less than 5% for all three designs.
Engineering of electron–longitudinal optical phonon coupling strength in m-plane GaN terahertz quantum cascade lasers 査読有り

Li Wang, Tsung-Tse Lin, Ming-Xi Chen, Ke Wang, Hideki Hirayama

Applied Physics Express　14　(11)　112003-112003　2021年11月1日
出版者・発行元： {IOP} Publishing
DOI： 10.35848/1882-0786/ac2a02 　

ISSN：1882-0778 1882-0786

eISSN：1882-0786
Over 1 Watt THz QCLs with high doping concentration and variable Al composition in active structure

Tsung-Tse Lin, Li Wang, Ke Wang, Thomas Grange, Stefan Birner, Hideki Hirayama

2021 27th International Semiconductor Laser Conference (ISLC)　2021年10月10日
出版者・発行元： IEEE
DOI： 10.1109/islc51662.2021.9615737 　
Plasma assisted molecular beam epitaxy growth mechanism of AlGaN epilayers and strain relaxation on AlN templates 査読有り

Zhenhua Li, Pengfei Shao, Yaozheng Wu, Genjun Shi, Tao Tao, Zili Xie, Peng Chen, Yugang Zhou, Xiangqian Xiu, Dunjun Chen, Bin Liu, Ke Wang, Youdou Zheng, Rong Zhang, Tsungtse Lin, Li Wang, Hideki Hirayama

Japanese Journal of Applied Physics　60　(7)　075504-075504　2021年7月1日
出版者・発行元： {IOP} Publishing
DOI： 10.35848/1347-4065/ac0bed 　

ISSN：0021-4922 1347-4065

eISSN：1347-4065
Development of High Power Terahertz Quantum Cascade Lasers by Reducing Leakage Current Using Non-Equilibrium Green’s Function Method 査読有り

Tsung-Tse LIN, Li WANG, Ke WANG, Hideki HIRAYAMA

The Review of Laser Engineering　48　(5)　250-250　2020年
出版者・発行元： Laser Society of Japan
DOI： 10.2184/lsj.48.5_250 　

ISSN：0387-0200 1349-6603

eISSN：1349-6603
Short-period scattering-assisted terahertz quantum cascade lasers operating at high temperatures 査読有り

Li Wang, Tsung-Tse Lin, Ke Wang, Thomas Grange, Stefan Birner, Hideki Hirayama

Scientific Reports　9　(1)　9446　2019年12月
出版者・発行元： Springer Science and Business Media {LLC}
DOI： 10.1038/s41598-019-45957-8 　

ISSN：2045-2322

eISSN：2045-2322
Optimization of THz QCLs by Suppressing a Leakage Current via High Energy States

Tsung-Tse Lin, Ke Wang, Li Wang, Hideki Hirayama

2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)　2019年9月
出版者・発行元： IEEE
DOI： 10.1109/irmmw-thz.2019.8873833 　
Parasitic transport paths in two-well scattering-assisted terahertz quantum cascade lasers 査読有り

Li Wang, Tsung-Tse Lin, Ke Wang, Hideki Hirayama

Applied Physics Express　12　(8)　082003-082003　2019年8月1日
出版者・発行元： {IOP} Publishing
DOI： 10.7567/1882-0786/ab2b56 　

ISSN：1882-0778 1882-0786

eISSN：1882-0786
Optimization of terahertz quantum cascade lasers by suppressing carrier leakage channel via high-energy state 査読有り

Tsung-Tse Lin, Li Wang, Ke Wang, Thomas Grange, Hideki Hirayama

Applied Physics Express　11　(11)　112702-112702　2018年11月1日
出版者・発行元： {IOP} Publishing
DOI： 10.7567/apex.11.112702 　

ISSN：1882-0778 1882-0786

eISSN：1882-0786
High output power THz quantum cascade lasers and their temperature dependent performance,高输出功率太赫兹量子级联激光器与温度特性査読有り

Lin, T.-T., Wang, K., Wang, L., Hirayama, H.

Hongwai Yu Haomibo Xuebao/Journal of Infrared and Millimeter Waves　37　(5)　513-517　2018年10月

DOI： 10.11972/j.issn.1001-9014.2018.05.001 　

ISSN：1001-9014
Broadening mechanisms and self-consistent gain calculations for GaN quantum cascade laser structures 査読有り

Ke Wang, Thomas Grange, Tsung-Tse Lin, Li Wang, Zolt{\'{a } }n, J{\'{e } }hn, Stefan Birner, Joosun Yun, Wataru Terashima, Hideki Hirayama

Applied Physics Letters　113　(6)　061109-061109　2018年8月6日
出版者・発行元： {AIP} Publishing
DOI： 10.1063/1.5029520 　

ISSN：0003-6951 1077-3118

eISSN：1077-3118
Controlling loss of waveguides for potential GaN terahertz quantum cascade lasers by tuning the plasma frequency of doped layers 査読有り

Ke Wang, Tsung-Tse Lin, Li Wang, Wataru Terashima, Hideki Hirayama

Japanese Journal of Applied Physics　57　(8)　081001-081001　2018年8月1日
出版者・発行元： {IOP} Publishing
DOI： 10.7567/jjap.57.081001 　

ISSN：0021-4922 1347-4065

eISSN：1347-4065
Variable Barrier Height AlGaAs/GaAs Quantum Cascade Laser Operating at 3.7 THz 査読有り

Tsung-Tse Lin, Hideki Hirayama

physica status solidi (a)　215　(8)　1700424-1700424　2018年4月
出版者・発行元： Wiley
DOI： 10.1002/pssa.201700424 　

ISSN：1862-6300
Waveguide design for GaN/AlGaN terahertz quantum cascade lasers

Ke Wang, Tsung-Tse Lin, Wataru Terashima, Hideki Hirayama

JSAP-OSA Joint Symposia 2017 Abstracts　2017年
出版者・発行元： Optica Publishing Group
DOI： 10.1364/jsap.2017.7a_a409_5 　

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III-nitrides which have much larger phonon energies (91meV in GaN) can in principle allow for terahertz quantum cascade lasers (THz QCLs) to operate at higher temperatures than GaAs based THz QCLs[1-2], in which the thermally activated phonon scattering depopulation and backfilling are limiting THz lasing at <200 K. GaN THz-QCLs would be key coherent sources in the unexplored terahertz frequency range of 5-12 THz, at which GaAs THz-QCLs are not able to work due to the Reststrahlen band.
250 mW output power operation of GaAs-based THz quantum cascade lasers

Tsung-Tse Lin, Wataru Terashima, Hideki Hirayama

JSAP-OSA Joint Symposia 2017 Abstracts　2017年
出版者・発行元： Optica Publishing Group
DOI： 10.1364/jsap.2017.7a_a409_6 　

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THz quantum cascade lasers (QCLs) [1,2] are promising high output power semiconductor THz sources to over Watt order peak power [3] with narrow bandwidth. It is still quite limited for the THz applications caused by the large cryogenic system and low duty cycle with low output power at high operation temperature. Output power is one of the most critical parameters for real applications. We demonstrated a 77 K liquid nitrogen Dewar condenser as a compromised compact portable THz source unit with our fabricated QCLs. They showed a stable few ten mW peak power with sub mW average power operation. Analysis the temperature performance of structures by Non-Equilibrium Green’s Function (NEGF) method are discussed. The improvement of the active region and waveguide fabrication will also be discussed for high output power operation in order to exhibit the best performance of the compact 77 K Dewar system.
Design for Stable Lasing of an Indirect Injection THz Quantum Cascade Laser Operating at Less Than 2 THz 査読有り

Tsung-Tse Lin

International Journal of Materials Science and Applications　6　(5)　230-230　2017年
出版者・発行元： Science Publishing Group
DOI： 10.11648/j.ijmsa.20170605.11 　

ISSN：2327-2635
THz quantum cascade lasers toward high output power near liquid nitrogen temperature operation with Dewar condenser

Tsung-Tse Lin, Wataru Terashima, Hideki Hirayama

2016 41st International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)　2016年9月
出版者・発行元： IEEE
DOI： 10.1109/irmmw-thz.2016.7758681 　
テラヘルツ量子カスケードレーザーの進展 (「微小レーザーおよび光源の最前線」特集号) 査読有り

平山秀樹, 寺嶋亘, 林宗澤

レーザー研究 = The review of laser engineering : レーザー学会誌　44　(8)　520-520　2016年
出版者・発行元：レーザー学会
DOI： 10.2184/lsj.44.8_520 　

ISSN：0387-0200

eISSN：1349-6603
テラヘルツ量子カスケードレーザーの進展と今後の展望査読有り

平山秀樹, 寺嶋亘, 林宗澤

応用物理　84　(10)　918-923　2015年10月
出版者・発行元：応用物理学会
DOI： 10.11470/oubutsu.84.10_918 　

ISSN：0369-8009
Recent progress and future prospects of THz quantum-cascade lasers

H. Hirayama, W. Terashima, Tsung-Tse Lin, Miho Sasaki

Novel In-Plane Semiconductor Lasers XIV　2015年3月10日
出版者・発行元： SPIE
DOI： 10.1117/12.2082723 　

ISSN：0277-786X
The 3.7THz 145K operation modulation barriers structure quantum cascade lasers

Tsung-Tse Lin, Hideki Hirayama

Optics InfoBase Conference Papers　2019　2015年
出版者・発行元： OSA - The Optical Society
1.9 THz selective injection design quantum cascade laser operating at extreme higher temperature above the k _B T line 査読有り

Sasaki Miho, Tsung-Tse Lin, Hideki Hirayama

physica status solidi c　10　(11)　1448-1451　2013年11月
出版者・発行元： Wiley
DOI： 10.1002/pssc.201300267 　

ISSN：1862-6351 1610-1642

eISSN：1610-1642
Improvement of operation temperature in GaAs/AlGaAs THz‐QCLs by utilizing high Al composition barrier 査読有り

Tsung-Tse Lin, Hideki Hirayama

physica status solidi c　10　(11)　1430-1433　2013年11月
出版者・発行元： Wiley
DOI： 10.1002/pssc.201300216 　

ISSN：1862-6351 1610-1642

eISSN：1610-1642
1.9 THz indirect injection Al<inf>0.175</inf>Ga<inf>0.825</inf>As/GaAs quantum cascade laser operating at extreme higher temperature

T.-T. Lin, M. Sasaki, H. Hirayama

2013 38th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)　2013年9月
出版者・発行元： IEEE
DOI： 10.1109/irmmw-thz.2013.6665538 　
Operation temperature and T<inf>0</inf> improvement of GaAs/AlGaAs THz QCL by utilizing higher Al composition barriers

T.-T Lin, H. Hirayama

2013 Conference on Lasers and Electro-Optics Pacific Rim (CLEOPR)　2013年6月
出版者・発行元： IEEE
DOI： 10.1109/cleopr.2013.6600250 　
Threshold Current Density Reduction by Utilizing High-Al-Composition Barriers in 3.7 THz GaAs/AlxGa1-xAs Quantum Cascade Lasers 査読有り

Lin Tsung-Tse, Ying Leiying, Hirayama Hideki

Applied physics express　5　(1)　012101-012101　2012年1月
出版者・発行元： The Japan Society of Applied Physics
DOI： 10.1143/apex.5.012101 　

ISSN：1882-0778

eISSN：1882-0786

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The temperature dependence of threshold current density (J_{\text{th } }) for GaAs/AlxGa1-xAs terahertz quantum cascade lasers (THz-QCLs) with different Al barrier compositions is studied. We achieved a maximum operation temperature (T_{\text{max } }) of 143 K for a 3.7 THz QCL by employing a longitudinal-optical (LO) phonon depopulation scheme. High-Al-composition barriers are used for increasing averaged LO-phonon energy. A significant reduction in J_{\text{th } } of approximately 30% was obtained by increasing the Al composition from 15 to 35%, when we used the same energy separation of the depopulation stats (E_{21}). T_{\text{max } } could be increased by using high-Al-composition structures due to the reduction of thermally-activated LO-phonon scattering.
Significant reduction of threshold current density of GaAs/AlGaAs terahertz quantum cascade lasers by using high-al-content AlGaAs barrier

Tsung-Tse Lin, Leiying Ying, Hideki Hirayama

2011 International Conference on Infrared, Millimeter, and Terahertz Waves　2011年10月
出版者・発行元： IEEE
DOI： 10.1109/irmmw-thz.2011.6105198 　
Thermally Activated Longitudinal Optical Phonon Scattering of a 3.8 THz GaAs Quantum Cascade Laser 査読有り

Lin Tsung-Tse, Ohtani Keita, Ohno Hideo

Applied physics express　2　(2)　022102-022102　2009年1月23日
出版者・発行元： Japan Society of Applied Physics
DOI： 10.1143/apex.2.022102 　

ISSN：1882-0778

eISSN：1882-0786

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Thermally activated longitudinal optical (LO) phonon scattering time ($\tau_{\text{thermal LO } }$) of excited subbands in a 3.8 THz quantum cascade laser is studied. The active region used herein is based on a LO phonon depopulation scheme. A single plasmon waveguide was used for optical confinement. By calculating the temperature dependence of threshold current density ($J_{\text{th } }$) and comparing with the experiment, $\tau_{\text{thermal LO } }$ limiting the characteristic temperature of $J_{\text{th } }$ is estimated: $\tau_{\text{thermal LO } }$ is 246 ns at 5 K, which rapidly decreases 15 ps when temperature rises up to 100 K.

︎全件表示 ︎最初の5件までを表示

書籍等出版物 2

Quantum Cascade Laser: THz QCLs Design Toward Real Applications

Tsung-Tse Lin

2017年

ISBN: 9789535149057
Quantum Cascade Lasers (QCLs): Types and Applications

Tsung-Tse Lin

2016年

ISBN: 9781536103878

講演・口頭発表等 64

Recent Progress in Development of A UTC-PDIntegrated HEMT Photonic Double-Mixer for Beyond5G Fiber-Wireless-Convergence Network System 招待有り

A. Satou, T. T. Lin, T. Otsuji

The 12th International Symposium on Terahertz-Related Devices and Technologies: TeraTech 2025
300-GHz-Band Operation of UTC-PD-Integrated HEMT Photonic Double-Mixer

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

the 49th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2024)　2024年9月4日
Verification of 300-GHz-Band Photonic Double-Mixing by UTC-PD-Integrated HEMT

S. Horiuchi, M. Watanabe, T.-T. Lin, S. Uchigasaki, K. Tamura, T. Suemitsu, T. Otsuji, A. Satou

the 11st International Symposium on Terahertz-Related Devices and Technology (TeraTech 2024)　2024年6月10日
Efficient Optical-to-sub-THz Carrier Frequency Down-Conversion by UTC-PD-Integrated HEMT

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

2023 IEEE International Topical Meeting on Microwave Photonics (IEEE MWP 2023)　2023年10月16日
Utilizing High-Intensity Optical Subcarrier Signal for Conversion Gain Enhancement of a UTC-PD-Integrated HEMT Photonic Double-Mixer 招待有り

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

The 48th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2023)
テラヘルツ量子カスケードレーザーの進展招待有り

平山秀樹, 王利, 林宗澤, 陳明曦

第167回微小光学研究会―レーザーの新境地　2023年6月1日
Progressing in terahertz quantum cascade lasers: approaching room-temperature operation based on GaAs and extending to undeveloped frequencies based on GaN 招待有り

Li WANG, Tsung-Tse LIN, Ming-Xi CHEN, Ke WANG, Hideki HIRAYAMA

レーザ・量子エレクトロニクス研究会（LQE) 5月研究会　2023年5月23日
高出力テラヘルツ量子カスケードレーザ招待有り

林宗澤, 王利, 王科, 平山秀樹

レーザ・量子エレクトロニクス研究会（LQE) 5月研究会　2023年5月23日
Conversion Gain Enhancement of a UTC-PD-Integrated HEMT Photonic Double-Mixer by High-Intensity Optical Subcarrier Signal

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

Optical Fiber Communication Conference (OFC 2023)
1.39-Watt Operation of THz Quantum Cascade Laser with Highly Doped Depopulation Layers

Tsung-Tse Lin, Li Wang, Ke Wang, Thomas Grange, Stefan Birner, Hideki Hirayama

International semiconductor laser conference (ISLC 2022)
Optical gain in terahertz quantum cascade lasers based on wide-bandgap semiconductor quantum structures ZnO/ZnMgO

Wang Li, Lin Tsung-Tse, Grange Thomas, Wang Ke, Chen Mingxi

The International Workshop on Nitride Semiconductors (IWN 2022)
Consideration of the interface diffusions for narrow-period terahertz quantum cascade lasers

Wang Li, Lin Tsung-Tse, Grange Thomas, Wang Ke, Hirayama Hideki

2022 International Conference on Solid State Devices Materials (ssdm2022)
Doping study of terahertz quantum cascade lasers

Miyoshi Teppei, Wasilewski Zbig, Lin Tsung-Tse, Hirayama Hideki, Ban Dayan, Wang Kai Xi

47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz 2022)
High Doping Concentration and Variable Al Composition THz Quantum Cascade Lasers with 1.39-Watt Operation

Tsung-Tse Lin, Li Wang, Ke Wang, Thomas Grange, Stefan Birner, Hideki Hirayama

47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz 2022)
Over 1 Watt THz QCLs with high doping concentration and variable Al composition in active structure 招待有り

Tsung-Tse Lin

Conference on Lasers & Electro-optics (CLEO 2022)
Over 1 Watt THz QCLs with high doping concentration and variable Al composition in active structure

Tsung-Tse Lin, Li Wang, Ke Wang, Thomas Grange, Stefan Birner, Hideki Hirayama

27th International Semiconductor Laser Conference (ISLC 2021)
Room temperature THz quantum cascade laser 招待有り

Li Wang, Tsung-Tse Lin, Ke Wang, Hideki Hirayama

The 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2021)
高出力テラヘルツQCLの進展招待有り

林宗澤

テラヘルツ波科学技術と産業開拓第182委員会第45回研究会　2021年4月8日
Recent progress in GaAs THz-QCLs and towards realizing GaN based QCLs

Ke Wang, Tsung-Tse Lin, Li Wang, Hideki Hirayama

SPIE Photonics West
Simulation and growth of GaN/AlGaN based terahertz quantum cascade structures

Ke Wang, Li Wang, Tsung-Tse Lin, Koichi Fukuda, Rong Zhang, Hideki Hirayama

The 9th Asia-Pacific Workshop on Widegap Semiconductors (APWS2019)
Experimental and theoretical study of piezoelectric polarization in GaN/AlGaN terahertz quantum cascade lasers

Li Wang, Tsung-Tse Lin, Ke Wang, Thomas Grange, Hideki Hirayama

The 15th International Conference on Intersubband Transitions in Quantum Wells
Optimization of THz QCLs by suppressing a leakage current via high energy states

Tsung-Tse Lin, Ke Wang, Li Wang, Hideki Hirayama

The 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2019)
Recent progress of high-power THz QCLs

Tsung-Tse Lin, Wang Ke, Wang Li, Hideki Hirayama

理研シンポジウム第6回「光量子工学研究」
Optimization of terahertz quantum cascade lasers by suppressing a carrier leakage channel via a high energy state 招待有り

Tsung-Tse Lin, Hideki Hirayama

1st International Conference on Photonics Research (ICPR2018)
THz-QCLs toward high output power near liquid nitrogen temperature operation 招待有り

Tsung-Tse Lin, Hideki Hirayama

14th International Conference on Modern Materials and Technologies (CIMTEC2018)
Recent progress of high power THz quantum cascade lasers 招待有り

Tsung-Tse Lin

Nanotech Malaysia 2018
Recent progress and future prospects of THz quantum cascade lasers 招待有り

Tsung-Tse Lin

國立交通大学特別講演　2017年12月25日
間接注入機構を用いたTHz QCL高温動作の進展

Tsung-Tse Lin, Wang Ke, Wang Li, Koichi Fukuda, Hideki Hirayama

理研シンポジウム第5回「光量子工学研究」
Design of THz QCLs toward high output power near liquid nitrogen temperature operation 招待有り

Tsung-Tse Lin, Hideki Hirayama

Nano Science & Technology-2017 (Nano S&T 2017)
Design THz quantum cascade lasers toward high output power near liquid nitrogen temperature operation

Tsung-Tse Lin, Hideki Hirayama

International Conference on Solid State Devices and Materials (SSDM 2017)
waveguide design for GaN/AlGaN terahertz quantum cascade lasers

Ke Wang, Tsung-Tse Lin, Wataru Terashima, Hideki Hirayama

The 14th International Conference on Intersubband Transitions in Quantum Wells (ITQW2017)
THz quantum cascade lasers toward high output power near liquid nitrogen temperature operation

Tsung-Tse Lin, Hideki Hirayama

The 14th International Conference on Intersubband Transitions in Quantum Wells (ITQW2017)
THz quantum cascade lasers toward high output power near liquid nitrogen temperature operation

Tsung-Tse Lin, Hideki Hirayama

The 24th Congress of the International Commission for Optics (ICO-24)
THz quantum cascade lasers toward high output power near liquid nitrogen temperature operation with Dewar condenser

Tsung-Tse Lin, Wataru Terashima, Hideki Hirayama

The 44th International Symposium on Compound Semiconductors (ISCS 2017)
Variable height active structure design THz QCLs operating at 3.7 THz with the maximum operation temperature 145 K

Tsung-Tse Lin and Hideki Hirayama

The 44th International Symposium on Compound Semiconductors (ISCS 2017)
Design of indirect injection scheme THz QCLs with high operation temperature

Tsung-Tse Lin, Hideki Hirayama

The 44th International Symposium on Compound Semiconductors (ISCS 2017)
Recent progress of GaN-based terahertz quantum cascade lasers 招待有り

Wataru Terashima, Tsung-Tse Lin, Hideki Hirayama

5th Russia-Japan-USA-Europe Symposium on Fundamental & Applied Problems of Terahertz Devices & Technologies (RJUSE TeraTech-2016)
Hz quantum cascade lasers toward high output power near liquid nitrogen temperature operation with Dewar condenser

Tsung-Tse Lin, Wataru Terashima, Hideki Hirayama

The 41st International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2016)
Progress of THz quantum cascade lasers using nitride semiconductor 招待有り

Hideki Hirayama, Wataru Terashima, Tsung-Tse Lin, Shiro Toyoda, Norihiko Kamata

74th Device Research Conference (DRC 2016)
Modulation active structure design indirect injection scheme THz QCLs 招待有り

Tsung-Tse Lin, Hideki Hirayama

EMN meeting on terahertz
Indirect injection scheme THz QCLs with high operation temperature 招待有り

Tsung-Tse Lin, Hideki Hirayama

EMN meeting on Vacuum Electronics
間接注入機構を用いたTHz QCL高温動作の進展

林宗澤, 平山秀樹

理研シンポジウム第3回「光量子工学研究」
Modulation barrier design AlxGa1-xAs/GaAs terahertz quantum cascade lasers

Tsung-Tse Lin, Hideki Hirayama

The 13th International Conference on Intersubband Transitions in Quantum Wells (ITQW2015)
AlGaAs/GaAs quantum cascade lasers with modulation Al composition barriers design lasing at 3.7 THz, 145 K

Tsung-Tse Lin, Hideki Hirayama

The Second International Symposium on Frontiers in THz Technology (FTT 2015)
AlGaAs/GaAs quantum cascade lasers with variable Al composition barriers lasing at 3.7 THz

Tsung-Tse Lin, Hideki Hirayama

International Quantum Cascade Lasers School & Workshop 2014 (IQCLSW 2014)
テラヘルツ量子カスケードレーザの現状と今後の展望招待有り

平山秀樹, 寺嶋亘, 林宗澤, 佐々木美穂

テラテクビジネスセミナー「産業応用拡大に向けたテラヘルツ技術の最先端と展望」　2014年9月5日
テラヘルツ量子カスケードレーザの進展と今後の展望招待有り

平山秀樹, 寺嶋亘, 林宗澤, 佐々木美穂

テラヘルツ波科学技術と産業開拓第182委員会、第21回研究会　2014年7月17日
1.9 THz indirect injection Al0.175Ga0.825As/GaAs quantum cascade laser operating at extreme higher temperature

Tsung-Tse Lin, Miho Sasaki, Hideki Hirayama

The 38rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2013)
Operation temperature and T0 improvement of GaAs/AlGaAs THz QCL by utilizing higher Al composition barriers

Tsung-Tse Lin, Hideki Hirayama

10th Conference on Lasers and Electro-Optics Pacific Rim 2013 (CLEO-PR 2013)
Improvement of operation temperature with lager T0 in AlGaAs THz QCLs by utilizing high Al composition

Tsung-Tse Lin, Hideki Hirayama

The 40th International Symposium on Compound Semiconductors (ISCS 2013)
High Al composition AlGaAs THz QCLs with operation temperature and T0 improvement

Tsung-Tse Lin, Hideki Hirayama

Advance Lasers and Photon Sources 2013 (ALPS’ 2013)
Development of Deep-UV LEDs and THz-QCLs and those applications 招待有り

Hideki Hirayama, Sachie Fujikawa, Noritoshi Maeda, Wataru Terashima, Tuung-Tse Lin, Norihiko Kamata

Advance Lasers and Photon Sources 2013 (ALPS’ 2013)
High-Al-composition GaAs/AlxGa1-xAs terahertz quantum cascade lasers for higher temperature operation

Tsung-Tse Lin, Hideki Hirayama

31th International Conference on the Physics of Semiconductors (ICPS2012)
Higher temperature operation LO phonon depopulation terahertz quantum cascade lasers design with high-Al-composition

Tsung-Tse Lin and Hideki Hirayama

International Conference on Superlattices, Nanostructure, and Nanodevices (ICSNN2012)
テラヘルツ量子カスケードレーザーの進展と今後の展望招待有り

平山秀樹, 寺嶋亘, 林宗澤

レーザー学会学術講演会第32回年次大会　2012年1月31日
Recent progress and future prospects of THz-quantum-cascade lasers 招待有り

The 4th Japan-Korea Joint Workshop on Terahertz Technology
テラヘルツ量子カスケードレーザーの進展と今後の展望招待有り

電子情報通信学会・エレクトロニクスソサエティ・電子デバイス研究会「ミリ波・テラヘルツ波デバイス・システム」　2011年12月14日
Proposal of utilizing high-Al-composition AlxGa1-xAs / AlyGa1-yAs terahertz quantum cascade lasers

Tsung-Tse Lin, Hideki Hirayama

The 1st International Symposium on Terahertz Nanoscience (TeraNano 2011) and 2nd Workshop of International Terahertz Research Network (GDR-I THz 2011)
Significant reduction of threshold current density of GaAs/AlGaAs terahertz quantum cascade lasers by using high-Al-content AlGaAs barrier

Tsung-Tse Lin, Leiying Ying, Hideki Hirayama

The 36rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz2011)
Temperature dependence of threshold current density of GaAs/ AlxGa1-xAs terahertz quantum cascade lasers with different Al composition

Tsung-Tse Lin, Leiying Ying, Hideki Hirayama

The 11th International Conference on Intersubband Transitions in Quantum Wells (ITQW2011)
Fabrication of copper metal-metal waveguide by radio frequency sputtering method

Keita Ohtani, Tsung-Tse Lin, Hideo Ohno

The 10th International Conference on Intersubband Transitions in Quantum Wells (ITQW2009)
Fabrication and operation of a metal-metal waveguide GaAs terahertz quantum cascade laser

Tsung-Tse Lin, Keita Ohtani, Hideo Ohno

14th International Conference on Modulated Semiconductor structures (MSS-14)
Temperature dependence of threshold current density of terahertz QCL

Tsung-Tse Lin, Keita Ohtani, Hideo Ohno

2008 International Conference on Solid State Devices and Materials
Temperature dependence of threshold current density of terahertz QCL: Comparison with mid-infrared QCL

Tsung-Tse Lin, Keita Ohtani, Hideo Ohno

International Quantum Cascade Lasers School & Workshop

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産業財産権 6

量子カスケードレーザー素子（面発光）

Joosun Yun, 林宗澤, 平山秀樹

産業財産権の種類: 特許権
量子カスケードレーザー素子（フォトニック結晶）

陳明曦、王利、林宗澤、大谷知行、平山秀樹

産業財産権の種類: 特許権
量子カスケードレーザー素子（室温動作テラヘルツ量子カスケードレーザー）

王利、林宗澤、平山秀樹

産業財産権の種類: 特許権
量子カスケードレーザー素子（水平リーク電流低減により高出力THz-QCLを実現する提案）

平山秀樹, 林宗澤, 王利, 王科

産業財産権の種類: 特許権
量子カスケードレーザー素子（間接注入型機構による低周波数、高温動作THz-QCLの実現）

平山秀樹、林宗澤、佐々木美穂

産業財産権の種類: 特許権
量子カスケードレーザー素子（高Al組成AlGaAsバリアを用いた高温型THz-QCLの提案）

平山秀樹, 林宗澤

産業財産権の種類: 特許権

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共同研究・競争的資金等の研究課題 6

サブバンド間遷移機構の革新による未踏周波数・室温動作THz-QCL実現に関する研究

平山秀樹, 林宗澤, 王利, 藤川紗千恵

提供機関：Japan Society for the Promotion of Science

制度名：Grants-in-Aid for Scientific Research

研究種目：Grant-in-Aid for Scientific Research (S)

研究機関：Institute of Physical and Chemical Research

2024年4月1日～ 2029年3月31日
メタマテリアルTHz QCLsの高出力化と制御化に関する研究

林宗澤

提供機関：Japan Society for the Promotion of Science

制度名：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

研究種目：Grant-in-Aid for Scientific Research (C)

研究機関：Institute of Physical and Chemical Research

2018年4月～ 2021年3月

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本研究では、高出力向けの発光層設計最適化に着目する、非平衡グリーン関数（NEGF）法に基づいた第一原理計算によって、THz QCL発光層のサブバンド準位設計から新規リーク電流の起源を明らかにし、そのリーク電流の低減方法を考案する。高温動作でも高い光利得を得る可変Al組成の障壁井戸発光層構造を始めて提案します。上位発振準位から高エネルギー準位経由の横方向リーク電流の減少と上位発振準位への注入電流の増大により、高い光利得の発光層を実現します。メタマテリアル構造の面発光THz QCLsの導波路を解析します。4.1THzのピーク出力1.3W、平均出力55mWの高出力THz QCLを実現しました。
両面金属導波路構造作製技術の構築によるＧａＮ系ＴＨｚ－ＱＣＬの高温動作化

寺嶋亘, 林宗澤

提供機関：Japan Society for the Promotion of Science

制度名：Grants-in-Aid for Scientific Research

研究種目：Grant-in-Aid for Challenging Exploratory Research

研究機関：Institute of Physical and Chemical Research

2015年4月1日～ 2017年3月31日

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本研究は砒化ガリウム材料および窒化ガリウム材料における量子構造の最適化と両面金属導波路構造の作製技術の構築を行うことで、テラヘルツ帯量子カスケードレーザの最大の課題である動作温度の高温化を実現することを目的とした。砒化ガリウム系材料において変調障壁層と電子引抜障壁層を量子カスケード構造に組み込むことで、145 Kまでの高温動作化に成功した。窒化ガリウム系材料における両面金属導波路構造の作製技術構築では、メタルボンディング条件を確立しレーザアブレーションを施すことによって窒化ガリウム系量子構造をサファイア基板から剥離することに成功した。
モジュレーションバリア構造を用いたTHz QCLs の動作高温化に関する研究

林宗澤

提供機関：Japan Society for the Promotion of Science

制度名：Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

研究種目：Grant-in-Aid for Young Scientists (B)

研究機関：Institute of Physical and Chemical Research

2015年4月～ 2017年3月

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同時に実現困難の期待される別々の注入、発光と引き抜き三機構をより高い設計自由度のモジュレーション発光層（変動的な高さバリアと井戸）を用いて、一つの構造の統合を実現する。発光バリアは他のバリアより低く設計すると同じ振動子強度維持する同時に表面ラフネス（IR）散乱が減少します。細高いエクステンションバリアを用いて、下発振準位から引き抜き準位振動子強度増やすとIR散乱を利用する、効率よく引き抜きを実現します。上発振準位から引き抜き準位空間的の分離もできる、高温のリーク電流を減少する。本研究は初めての高温動作実験デモを報告しました。高出力の素子（ピーク250mWと平均2.2mW）も実現しました。
THz量子カスケードレーザの動作高温化と周波数拡大に関する研究

平山秀樹

2011年～ 2015年

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テラヘルツ量子カスケードレーザ(THz-QCL)は、小型・高効率、長寿命、連続出力、安価なテラヘルツ光源として、各種透視検査・計測機器など幅広い応用分野での利用が期待されています。本研究では、THz-QCLに新しい量子構造や新規半導体材料系を導入するなど素子構造を革新することで、動作温度の向上、周波数領域の拡大、閾値電流の低減などの高性能化を行い、実用化を目指したTHz-QCLの開発を行います。
InAs量子カスケードレーザの次元性の制御とその効果

大野英男, 大谷啓太, 林宗澤, ベルムバーリックモハッマド, 佐藤啓貴

提供機関：Japan Society for the Promotion of Science

制度名：Grants-in-Aid for Scientific Research

研究種目：Grant-in-Aid for Scientific Research (A)

研究機関：Tohoku University

2007年～ 2009年

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InAs中赤外量子カスケードレーザ(QCL)の磁場によるキャリアの閉じ込め効果を調べるために、量子井戸の面内に平行方向、及び垂直方向に磁場を印加し、特性を評価した。磁場を面内垂直方向に印加すると、ランダウ準位形成により閾値電流密度が減少した。一方で面内平行方向では閾値電流密度は変化せず、スロープ効率のみが増加するという特異な振る舞いを観測した。又テラヘルツ(THz)帯においても磁場の効果を調べるため、GaAs THz QCLを開発した。加えてTHz帯で高性能化が期待できるZnO量子井戸においてサブバンド間遷移を初めて観測した。

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