| Project/Area Number |
25600105
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Optical engineering, Photon science
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| Research Institution | Hokkaido University |
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Principal Investigator |
TODA YASUNORI 北海道大学, 工学(系)研究科(研究院), 教授 (00313106)
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| Co-Investigator(Kenkyū-buntansha) |
ADACHI Satoru 北海道大学, 大学院・工学研究院, 教授 (10221722)
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| Co-Investigator(Renkei-kenkyūsha) |
NAKAYAMA Masaaki 大阪市立大学, 大学院・工学研究院, 教授 (30172480)
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| Project Period (FY) |
2013-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | 光物性 / コヒーレント分光 / 縮退四光波混合 / 光渦 / 軌道角運動量 / 励起子物理 / トポロジカル変換 / 励起子 |
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| Outline of Final Research Achievements |
Spatiotemporal four-wave mixing (FWM) spectroscopy of semiconductor excitons was developed by using (A) variably controlled Laguerre-Gaussian (LG) pulses, (B) orbital angular momentum (OAM) resolved spectroscopy with high precision. The observed exciton OAM dynamics indicates that (1) near perfect OAM transfer to the exciton center-of-mass motion is achieved using the LG pulses with nonzero OAM, (2) imperfect conversion becomes significant when the excitation pulses include an OAM-free component (3) an extremely long OAM decay was observed in the bulk sample, which implies a small spatial variation of the exciton dephasing. Moreover, the topological charge dependence of the OAM dynamics suggests a robustness of the exciton OAM. For the application of the topological transformation, a novel spatially modulated optical feedback in a vertical-cavity surface-emitting laser was demonstrated for the first time, where the results show high selectivity of the OAM in the transverse mode.
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