Quantum Photonic Science and Spin-Photonics

"The 21st-century Advanced Information Era needs the development of ultrafast, compact, extremely-high capacity and low power-consuming devices, which also requires the quantum-mechanical understanding on the photon-controlled properties of charge/spin, the basic physical properties for the information-processing devices, and the fabrication of new-concept photon-controlled charge-spin devices which can perform a synthetic function for the information processing. Therefore, it is urgent to investigate the complete elucidation of the photon-controlled properties, represented by the photon-charge/spin ones, for the quantum structures (QS), and constructs the foundation for the advanced devices such as next-generation optical memory, optical/spin coherence devices, and new-concept photonics.

This can be obtained by performing the following researches; 1) ""Advanced photon-charge interactions"" investigates the quantum-mechanical (QM) correlations between photon and QS, such as advanced nonlinear optical thin films, photonic bandgap structures, etc., through phase-control, non/linear optical and ultrahigh-resolution spectroscopic studies, 2) ""Advanced photon-spin interactions"" concerns the QM correlations between photon and photon-spin QS, such as polarization-controlled hetero-structures, new-concept photon-spin QS, etc., through non/linear magneto-optical and ultrafast photon-spin dynamic studies, and 3) ""Control and application of photon-charge/spin interactions"" will play a central role to connect the electro- and magneto-optic characteristics, to design the photonic QS and to predict their photonic properties by simulation.

By establishing the unified understanding of photon-controlled charge/spin properties of QS, it is possible to create new-concept devices through the general but systematic elucidation of the photon-controlled properties of QS. Research results based on Co/Pt multilayered structures and magnetic shape-memory alloy films are presented as an initial example for this field of science, and the brief perspective of this science is also discussed.
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