| 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 |
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| Section | 一般 |
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| Research Field |
Applied materials science/Crystal engineering
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| Research Institution | National Institute of Advanced Industrial Science and Technology |
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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)
小倉 睦郎 独立行政法人産業技術総合研究所, ナノシステム研究部門, 主任研究員 (90356717)
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| Project Period (FY) |
2012-05-31 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥41,990,000 (Direct Cost: ¥32,300,000、Indirect Cost: ¥9,690,000)
Fiscal Year 2014: ¥8,970,000 (Direct Cost: ¥6,900,000、Indirect Cost: ¥2,070,000)
Fiscal Year 2013: ¥13,260,000 (Direct Cost: ¥10,200,000、Indirect Cost: ¥3,060,000)
Fiscal Year 2012: ¥19,760,000 (Direct Cost: ¥15,200,000、Indirect Cost: ¥4,560,000)
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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 / リッジ / 円錐台 / 半導体物性 / 光物性 / 先端機能デバイス |
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| 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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