Shun Takahashi

Associate Professor, Faculty of Electrical Engineering and Electronics, Kyoto Institute of Technology*Profile is at the time of the award.

2025Inamori Research GrantsScience & Engineering

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Research topics: Control of electron spins in a semiconductor-based helical photonic crystal

Summary: Circularly polarized light, where electric and magnetic fields draw helical trajectories, can be effectively controlled by helical photonic crystals with a structural period comparable to a wavelength of light. In this study, combined with a selective conversion between circularly polarized light and spins in solids, control of electron spins via circularly polarized light will be realized in a helical photonic crystal, and be observed by optical measurements. Emission from a cavity mode of circularly polarized light in a helical photonic crystal will be enhanced by Purcell effect when the selection rule of circularly polarized light and spins is satisfied.

Comment

Recently, rapid advancements have been made in photon-electron conversion through the precise control of light in photonic crystals. Extending this progress from opto-electronics to opto-spintronics may pave the way to reduce energy consumption in information processing, which becomes a global problem.

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