2014 Fiscal Year Final Research Report
Controlling the directionality of spontaneous emissions via the evanescent wave coupling effect in a fine truncated-cone structure
Project/Area Number |
24246011
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Research Category |
Grant-in-Aid for Scientific Research (A)
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Allocation Type | Single-year Grants |
Section | 一般 |
Research Field |
Applied materials science/Crystal engineering
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Research Institution | National Institute of Advanced Industrial Science and Technology |
Principal Investigator |
WANG Xuelun 独立行政法人産業技術総合研究所, 電子光技術研究部門, 研究グループ長 (80356609)
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Co-Investigator(Kenkyū-buntansha) |
AMANO Takeru 国立研究開発法人産業技術総合研究所, 電子光技術研究部門, 主任研究員 (10392581)
IMAMURA Hiroshi 国立研究開発法人産業技術総合研究所, スピントロニクス研究センター, 研究チーム長 (30323091)
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Project Period (FY) |
2012-05-31 – 2015-03-31
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Keywords | 指向性 / 発光ダイオード / エバネッセント光 / 結合 / リッジ構造 / 錐台構造 |
Outline of Final Research Achievements |
Spontaneous light sources with a well-defined spatial directionality are strongly desired in various applications. Despite the extensive studies devoted to controlling the radiation process of spontaneous emissions, there still lacks a reliable method which can provide a high directionality suitable for widespread applications, especially in terms of the stability of the directionality against variations in device operating conditions. In this work, we proposed a novel approach of controlling the directionality of spontaneous emissions which employs the evanescent wave coupling effect in a subwavelength-sized ridge or truncated cone structure. Strong directionalities characterized by a half-intensity angle of 43 degree are demonstrated for the first time by using a an InGaAs/GaAs light-emitting diode with fine ridges formed on its light-extraction surface. The directionality is found to be almost independent of operating conditions over a wide range of operating condition variations.
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Free Research Field |
化合物半導体結晶成長、光デバイス
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