2021 Fiscal Year Final Research Report
Ultrafast and efficient radiative decay due to coupling of light and multi-componet excitons in semiconductor single crystal thin films
| Project/Area Number |
19K03687
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 13020:Semiconductors, optical properties of condensed matter and atomic physics-related
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| Research Institution | The University of Shiga Prefecture |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 励起子 / 超高速光学応答 / 非線形光学 / 薄膜成長 |
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| Outline of Final Research Achievements |
We measured the degenerate four-wave mixing for high-quality ZnO thin films, and succeeded in observing a huge radiation shift that surpasses CuCl and an ultrafast nonlinear optical response of less than 100 fs. It was clarified that it was due to the interaction of the two excitons via light due to the fact that they were. In addition, the CuBr and CuI thin films formed on the CaF2 (111) substrate have a narrow XRD spectrum comparable to that of the powder sample, and succeeded in confirming that the single crystal structure has expanded to the order of 10 micrometer.
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| Free Research Field |
半導体、光物性および原子物理関連
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では、単結晶薄膜の高品質化によって位相緩和時間を長くすることに加え、ナノとバルクのクロスオーバー領域特有の光－励起子コヒーレント結合効果によって輻射緩和時間を極端に短くすることによって光学応答における輻射緩和特性が支配的になるとのアイデアに基づいている。これは、複雑な構造や機構に頼りがちな半導体材料の高機能化において、単純な構造で結晶の品質を高めるのみによってトレードオフの関係にあるとされてきた光学非線形性増大と超高速応答を両立させる試みとして独自性があり、光デバイス開発におけるブレイクスルーとなることが期待される。
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