| Project/Area Number |
19206033
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Electronic materials/Electric materials
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| Research Institution | Tohoku University |
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Principal Investigator |
OHNO Hideo Tohoku University, 電気通信研究所, 教授 (00152215)
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| Co-Investigator(Kenkyū-buntansha) |
OHTANI Keita 東北大学, 電気通信研究所, 助教 (40333893)
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| Research Collaborator |
LIN Tsung-tse 東北大学, 大学院・工学研究科, 博士後期課程学生
BELMOUBARIK Mohamed 東北大学, 大学院・工学研究科, 博士前期課程学生
SATO Hiroki 東北大学, 工学部・情報知能システム総合学科, 学部学生
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| Project Period (FY) |
2007 – 2009
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| Project Status |
Completed (Fiscal Year 2009)
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| Budget Amount *help |
¥34,060,000 (Direct Cost: ¥26,200,000、Indirect Cost: ¥7,860,000)
Fiscal Year 2009: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2008: ¥7,020,000 (Direct Cost: ¥5,400,000、Indirect Cost: ¥1,620,000)
Fiscal Year 2007: ¥22,100,000 (Direct Cost: ¥17,000,000、Indirect Cost: ¥5,100,000)
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| Keywords | 量子井戸 / MBE・エピタキシャル / 高性能レーザー / テラヘルツ赤外材料・素子 / サブバンド / MBE、エピタキシャル / 高性能レーザ / テラヘルツ / 赤外線素子 / 光源技術 / 量子エレクトロニクス / トンネル現象 / 赤外材料・素子 |
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| Research Abstract |
To investigate the effect of carrier dimensionality on the laser characteristics of InAs quantum cascade lasers (QCLs), we applied the magnetic field in the direction parallel and perpendicular to quantum wells (QWs) layers and measured the emission properties. When the magnetic field in the direction perpendicular to QWs was increased, the threshold current density (J_<th>) was decreased most probably due to the formation of the Landau levels. On the other hand, when the magnetic field parallel to QWs was increased, the enhancement of the slope efficiency was observed whereas J_<th> remained unchanged. Also to study its effect on the characteristics of terahertz (THz) QCLs, we fabricated the GaAs THz QCLs. In addition, we observed the intersubband transitions in ZnO QWs which is expected to improve the temperature characteristics of THz QCLs.
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