2022 Fiscal Year Final Research Report
Analysis of spectral shapes with narrow linewidths of high-Q organic crystal whispering gallery mode cavities
Project/Area Number |
20K04577
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Review Section |
Basic Section 21050:Electric and electronic materials-related
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Research Institution | Shizuoka University |
Principal Investigator |
Bando Kazuki 静岡大学, 理学部, 准教授 (50344867)
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Project Period (FY) |
2020-04-01 – 2023-03-31
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Keywords | 有機結晶 / 自己組織化 / リング共振器 / ウィスパリングギャラリーモード / Q値 |
Outline of Final Research Achievements |
It has been shown that self-assembled organic ring crystals behave as whispering gallery mode (WGM) cavities with Q-factors of about 2000. However, due to the narrow spectral linewidth, it was difficult to measure the precise linewidth using an ordinary spectrometer. Therefore, an attempt was made to clarify their spectral shapes by Fourier spectroscopy. In fact, it was found that their spectral shapes obtained by Fourier spectroscopy have narrow linewidths exceeding the resolution of the spectrometer used for the measurement. Furthermore, for several WGM peaks, the higher the Q-factor of the peak, the larger the Q-factor estimated from the ordinary photoluminescence spectra.
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Free Research Field |
光物性
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Academic Significance and Societal Importance of the Research Achievements |
半導体微小共振器は基礎科学的興味にとどまらず、発光量子効率向上、センサー応用、レーザー発振性能の向上など、様々な実用上の課題にも大きく貢献することが期待されてきた。特に有機材料系は素材自身の特徴など多様な点で実用化に期待が集まっている。これらのデバイスでは共振器の性能が重要であり、そのQ値の把握・制御がデバイス実現への本質的課題である。本研究で得られた有機結晶リング共振器は極めて高い共振器Q値を有しており、そのQ値を精密に見積もることは極めて重要である。分光器分解能を超える線幅の共振器モードについて、フーリエ分光という手法を用いて効率的かつ精密にQ値が得られたことは極めて重要であると言える。
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