| Project/Area Number |
15K13369
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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, 工学研究院, 教授 (00313106)
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| Project Period (FY) |
2015-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2016: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2015: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | 光物性 / 偏光渦 / 縮退四光波混合 / 応用光学・量子光工学 / コヒーレント分光 / 高性能レーザー / 量子エレクトロニクス / 特異点光学 |
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| Outline of Final Research Achievements |
We have developed a novel type of coherent spectroscopy (time-resolved polarimetry using nonlinear laser spectroscopy known as degenerate four-wave-mixing) using polarization vortices characterized by a vector singularity on the beam cross-section, and performed the spectroscopy on semiconductor GaN excitons (electron-hole pairs). We successfully obtained the results concerned as follows: (a) quantitative snap-shot evaluations of exciton spin exchange and uniaxial strain energies; especially for small residual anisotropies in isotropic samples; (b) coherent dynamics of the polarization singularities resulting from broken rotational symmetries of excitons, (c) spin and pseudo-spin dynamics and their correlations resulting from excitons interactions.
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