2021 Fiscal Year Annual Research Report
Near-infrared GaN quantum cascade laser for the next-generation self-driving car
| Project/Area Number |
21H01376
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| Allocation Type | Single-year Grants |
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| Research Institution | Institute of Physical and Chemical Research |
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Principal Investigator |
王 利 国立研究開発法人理化学研究所, 光量子工学研究センター, 研究員 (50804035)
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| Project Period (FY) |
2021-04-01 – 2025-03-31
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| Keywords | quantum cascade laser |
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| Outline of Annual Research Achievements |
1.Updating the quantum transport models (non-equilibrium green's functions) to describe the laser dynamic in near-infrared quantum cascade lasers: a. introduce the in-plane nonparabolicity; b. specify the scattering rate caused by interface roughness; c. consider a diffused interface at the GaN quantum well and AlGaN quantum barriers. 2. Developing the buffer layers on SiC substrate for GaN/AlGaN epitaxy, in order to engineer the strain in a thick quantum wells (QWs) heterostructures.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
1. the non-equilibrium green's functions models shows more reliable to predict the quantum cascade lasers (QCLs) design for guiding the way in experiments. The new designs of near-infrared QCLs with high optical gain at 300K are studied.
2. by using the buffer layers on raw SiC substrate, the initial QWs with a thickness more than 5 um has been grown, without cracks.
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| Strategy for Future Research Activity |
1. the non-equilibrium green's functions models indeed give full pictures on the quantum transport in the QCLs, however it is lack to show quantitative parameters as shown in regular models of rate equations. In the next year, we try to specify more the scattering process (i.e., impurity, alloy disorder, electron-electron interactions) on the scattering rate between pair of subbands.
2. as we can grow high-quality QWs, the QCLs structure will be fabricated in order to study its electrical properties (i.e., current-bias correlations) and possible radiations
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Research Products
(2 results)
