電界下での量子井戸の光物性と超高速光素子への応用

• Project/Area Number: 61065006
• Research Category: Grant-in-Aid for Specially Promoted Research
• Allocation Type: Single-year Grants
• Research Institution: Hiroshima University
• Principal Investigator: 山西 正道 広島大学, 工学部, 教授 (30081441)
• Co-Investigator(Kenkyū-buntansha): 菅 康夫 シャープ, 中央研究所, 助手研究員 (40177754) ; 末宗 幾夫 広島大学, 工学部, 助教授 (00112178)
• Project Period (FY): 1986 – 1989
• Project Status: Completed (Fiscal Year 1989)
• Budget Amount: ¥186,000,000 (Direct Cost: ¥186,000,000); Fiscal Year 1989: ¥15,000,000 (Direct Cost: ¥15,000,000); Fiscal Year 1988: ¥10,000,000 (Direct Cost: ¥10,000,000); Fiscal Year 1987: ¥36,000,000 (Direct Cost: ¥36,000,000); Fiscal Year 1986: ¥125,000,000 (Direct Cost: ¥125,000,000)
• Keywords: 量子井戸 / 発光素子 / 光非線形 / 高速変調光素子 / 超高速変調 / 仮想遷移 / 量子井戸箱 / 電界効果

Research Abstract

1.量子井戸電界効果形発光素子に関して、以下の特性を持つ動作を室温において初めて実現した。
(1)超格子バッファ層を用いることにより結晶性の改善をはかり、低注入電流(〜10A/cm^2)で、片面1%の外部効率が得られた。また、その内部効率は100%に近いと推測される。
(2)活性層内のキャリア密度を一定に保ったままで、電界効果によるキャリアの発光再結合寿命の変化のみにより発光強度を変化させるという、この素子において本質的に重要な動作を実現した。
(3)発光強度の変化に要する時間はキャリア寿命には制限されず、300psec以下の、発光ダイオードの動作としては極めて高速な動作を実現した。
(4)発光強度のオン、オフ比は10対1以上ある。
以上、低電流、高効率、高速発光素子という非常に実用性のある特性が実現されており、今後素子講造の改良により光の取りだし効率、スイッチング時間等を改善することで、この素子の実用化が見込まれる。
2.電界スクリーニングを用いた光双安定素子の双安定動作を初めて実現した。動作に必要な光入力は、1W/cm^2であり、スイッチングエネルギーは1fJ/μm^2程度、スイッチング時間は100nsec程度と見積られる。この素子は、照射光をある程度離すだけで、平面状の素子を分離することなく多数、相互に独立に動作させうると考えられ、上記の特性と合わせて二次元集積化に適した光回路素子の実現が今後期待できる。
3.ピコ秒域での光電流のオートコリレーションによる時間分割測定の結果、サブピコ秒の信号応答を観測した。これは、仮想励起キャリアが引き起こす超高速現象を間接的に捕らえたものである。

Research Products

• [Publications] Yasuo Kan: "Quantum-confined field-effect light emitters with high speed switching capability" Appl.Phys.Letters. 55. 1149-1151 (1989)
• [Publications] Yasuo Kan: "Room Temperature Operation of Quantum Confined Field Effect Light Emitters" Extended Abstracts of the 21st Conf.on Solid State Devices and Materials.553-554 (1989)
• [Publications] Yasuo Kan: "Optical Nonlinearity Caused by Charge-Induced Field Screening in DC-Biased Quantum Well Structures" Japan.J.Appl.Phys.28. L1585-L1588 (1989)
• [Publications] Masamichi Yamanishi: "Ultrafast Modulation of Quantum States by Virtual Charge Polarization in Biased Quantum Well Structures(invited paper)" Superlattices and Microstructures. 6. 403-408 (1989)
• [Publications] Masamichi Yamanishi: "Discrete Shifts of Absorption and Emission Lines by Individual Electron-Hole Pair Excitation in DC-Biased Quantum Box Structures" Japanese Journal of Appl.Phys.29. L308-L311 (1990)
• [Publications] Masamichi Yamanishi: "Ultrafast Control of Quantum States by Electric Field in Quantum Well Structures for Optical Devices(invited paper)" Proc.of the 1st Int.Conf.on Electronic Materials. 185-190 (1989)
• [Publications] Masamichi Yamanishi: "Ultrafast Optical Switching through Virtual Charge Polarization in dc-Biased Quantum-Well Structures(invited paper)" OSA Proc.Picosecond Electronics and Optoelectronics.239-241 (1989)
• [Publications] Masamichi Yamanishi: "Correspondence of Virtual Excitation with Coherent Electron Transport and Ultrafast Optoelectronic Devices(invited paper)" Extended Abstract of the 7th Int.Workshop on Future Electron Devices,Superlattices and Quantum Functional Devices. 153-157 (1989)
• [Publications] Masamichi Yamanishi: "Red and Virtual Charge Polarizations in DC Biased Low-Dimensional Semiconductor Stractures(invited paper)" Proc.NATO Workshop on Optical Switching in Low-Dimensional Systems. 71-82 (1989)
• [Publications] Masamichi Yamanishi: "Optical Nonlinearity due to Real and Virtual Charge Polarizations in DC-Biased Quantum Well Structures" Proc.Nonlinear Optical Materials and Devices for Photonic Switching. (1990)
• [Publications] 山西正道: "半導体量子井戸構造の光非線形現象" 光学. 18. 307-308 (1989)
• [Publications] 山西正道: "量子井戸構造の超高速光非線形性ー電場下における仮想電荷分極ー" 日本物理学会誌. 44. 38-41 (1989)
• [Publications] 山西正道: "量子井戸構造の仮想電荷分極による超高速光過程" 応用物理. 58. 1696-1707 (1989)
• [Publications] 山西正道: "量子効果光非線形デバイスの展望" 電子情報通信学会誌. 72. 1398-1403 (1989)
• [Publications] Yasuo Kan: "Room Temperature Operation of Three-Terminal Quantum-Confined Field-Effect Light Emitters" Appl.Phys.Lett.(1990)
• [Publications] Masahiro Okuda: "The Quantum Confined Field Effect Light Emitters:Device Physics and Experiments" IEEE J.Quantum Electron.
• [Publications] Keiji Mukaiyama: "High Speed Intensity Modulation by Quantum Confined Field Effect Combined with Modulation of Injection Current in Light Emitting Triodes" Japan,J.Appl.Phys.
• [Publications] Katsuhiro Obata: "Observation of Optical Bistability by Charge-induced Self Feedback in Biased AlGaAs Multiple Quantum Well Structures" Appl.Phys.Lett.
• [Publications] Yasutaka Sakata: "Ultrafast Response Evaluation of Virtual Excitation by Off-resonant Optical Pulse Mixing in GaAs/AlGaAs Quantun Well Structures" Optics Letters.
• [Publications] Tukanori Ohnishi: "300ps-Switchings of Spontaneous Emission by Quantum Confined Field Effect in a Light Emitting Triode" Photonics Technology Letters.
• [Publications] Yasuo Kan: "Quantum Confined Field Effect Light Emitting Triodes with Very High Speed Capability" IEEE J.Quantum Electronics.
• [Publications] Masamichi Yamanishi: "Virtual Charge-induced Optical Nonlinearity in DC-Biased Quantum Box Structures" Phys.Rev.
• [Publications] 山西正道: "量子井戸構造の超高速非線形光学ーその物理と夢ー" 日本物理学会誌.
• [Publications] 山西正道: "超高速光エレクトロニクス 第4章量子閉込構造半導体の光物性と応用" 培風館, (1990)
• [Publications] 山西正道: "量子閉込構造の超高速光過程" コロナ社,
• [Publications] Masamichi,Yamanishi: IEEE J.Quantum Electron.QE-24. 325-331 (1988)
• [Publications] Tohya,Hiroshima: Phys.Rev.B. 38. 1241-1245 (1988)
• [Publications] Masamichi,Yamanishi: J.Superlattices and Microstructures. 4. 633-636 (1988)
• [Publications] Masamichi,Yamanishi: Proc.6th Int.Conf.Ultrafast Phenomena. 334-336 (1988)
• [Publications] Yasuo,Kan: Extended Abstracts of the 20th(1988 Int.)Conf.on Solid State Devices and Materials,Tokyo. 633-634 (1988)
• [Publications] Yasuo,Kan: Topical Meeting on Quantum Wells for Optics and Optoelectronics. (1989)
• [Publications] Masamichi Yamanishi: Abstracts of Int.Conf.on Electronic Materials(ICEM'88),Tokyo. 24-25 (1988)
• [Publications] Masamichi Yamanishi: Superlattices,Microstructures and Microdevices.
• [Publications] Masamichi Yamanishi: Proc.NATO Workshop on optical switching in low dimensional systems.
• [Publications] Masamichi Yamanishi: Abstracts of the 1st Int.Conf.on Optoelectronics,Kobe. 72-73 (1988)
• [Publications] Masamichi Yamanishi: Technical Digest of the XVIth Int.Conf.on Quantum Electronics,Tokyo. 580-581 (1988)
• [Publications] Masamichi Yamanishi: Tech.Digest of Topical Meeting on Picosecond Electronics and Optoelectronics. (1989)
• [Publications] 山西正道: 1989年春季、第36回応用物理学関係連合講演会「量子閉込構造の非線形光学」シンポジウム. (1989)
• [Publications] 江崎玲於奈 監修: "「超格子、ヘテロ構造デバイス」第13章光学特性の電界効果と高速光デバイス(山西正道)" 工業調査会, 475-509 (1988)
• [Publications] 末田正、神谷武志: "「超高速光エレクトロニクス」第4章量子閉込構造半導体の光物性と応用(山西正道)" 培風館,
• [Publications] 日本物理学会: "日本物理学会誌 第44巻 量子井戸構造の超高速光非線形性-電場下における仮想電荷分極-(山西正道)" 38-41 (1989)
• [Publications] Ichiro Ogura: Japanese Journal of Applied Physics. 26. L1313-L1316 (1987)
• [Publications] Ichiro Ogura: Extended Abstracts of the 19th Couference on Solid State Devices and Materials, Tokyo. 367-370 (1987)
• [Publications] Masamichi Yamanishi: Optoelectronics Devices and Technologies. 2. 45-51 (1987)
• [Publications] Masamichi Yamanishi: Physical Review Letters. 59. 1014-1017 (1987)
• [Publications] Masamichi Yamanishi: IEEE Journal of Quantum Electronics. (1988)
• [Publications] Masamichi Yamanishi: Journal of Superlattices and Microstructures. (1988)
• [Publications] Yasuo Kan: IEEE Journal of Quantum Electronics. QE-23. 2167-2180 (1987)
• [Publications] Tohya Hiroshima: Rhysical Review B. (1988)
• [Publications] Masamichi Yamanishi: Advance Program of the Conference on Lasers and Electro-Optics (CLEO′87), Baltimore. 83 (1987)
• [Publications] Masamichi Yamsnishi: International Conference on Electronic Materials. (1988)
• [Publications] Masamichi Yamanishi: 4th International Conference on Superlattices, Microstructures and Microdevices. (1988)
• [Publications] Masamichi Yamanishi: Nato Workshop on ″Optical Switching in Low Dimensional Systems″. (1988)
• [Publications] Masamichi Yamanishi: Umited States-Japan Seminar on Quantum Mechanical Aspects of Quantum Electronics. 268-272 (1987)
• [Publications] 江崎玲於奈 監修 山西正道 他: "超格子・ヘテロ構造デバイス (第13章 光学特性の電界効果と高速光デバイス)" 工業調査会,
• [Publications] Hideo Nagai: Japanese Journal of Applied Physics. 25. L640-L642 (1986)
• [Publications] Yasuo Kan: Extended Abstracts of the 18th(1986.Int)Conf.on Solid State Devices and Materials. 595-598 (1986)
• [Publications] Hideo Nagai: Extended Abstracts of the 18th(1986 Int.)Conf.on Solid State Devices and Materials. 591-594 (1986)
• [Publications] Hideo Nagai: Electronics Letters. 22. 888-889 (1986)
• [Publications] Tadashi Takeoka: 1st Optoelectronics Conference Post-Deadline Papers Technical Digest. 2-3 (1986)
• [Publications] Tadashi Takeoka: Japanese Journal of Applied Physics. 26. L117-L119 (1987)