| Project/Area Number |
25286071
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Optical engineering, Photon science
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| Research Institution | Kyushu University |
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Principal Investigator |
OKADA TATSUO 九州大学, システム情報科学研究科(研究院, 教授 (90127994)
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| Co-Investigator(Kenkyū-buntansha) |
Nakamura Daisuke 九州大学, 大学院システム情報科学研究院, 准教授 (40444864)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥16,120,000 (Direct Cost: ¥12,400,000、Indirect Cost: ¥3,720,000)
Fiscal Year 2015: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2014: ¥8,320,000 (Direct Cost: ¥6,400,000、Indirect Cost: ¥1,920,000)
Fiscal Year 2013: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
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| Keywords | 酸化亜鉛 / ZnO / 微小球 / WGM / p-n接合 / レーザーアブレーション / ドーピング / マイクロキャビティ / ヘテロ接合 / 微小光共振器 / 屈折率センサ / ホトルミネッセンス / ウィスパリングギャラリーモード / 微小共振器 |
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| Outline of Final Research Achievements |
ZnO micro-spheres were synthesized by laser ablation in air using a Q-switched Nd:YAG laser and a normal-mode Nd:YAG laser, and their optical properties were characterized.
In order to realize p-type ZnO micro-spheres, P-doped ZnO micro-spheres were synthesized. When a heterojunction was made with P-doped ZnO micro-sphere and Al-doped n-type ZnO thin film, apparent rectifying I-V characteristics was observed. In order to control the lasing wavelength of ZnO micro-sphere, Mg doped ZnO micro-spheres were synthesized. When 5 wt% of Mg was doped, the lasing wavelength was 370 nm, which was shorter by 25 nm, compared with 395 nm for non-doped micro-spheres. We have obtained the UV EL emission from p-n junction consisting of Mg-doped ZnO micro-sphere and p-type GaN thin film.
In order to apply ZnO micro-spheres to sensor system, we have investigated the dependence of the lasing wavelength of ZnO WGM laser on the refractive index of the surrounding material experimentally and theoretically.
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