| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Outline of Final Research Achievements |
We have observed the chiral near-field distribution and the spectra on the series of achiral gold nano-rectangular structures (Au-NRs) under the circularly polarized light (CPL)irradiation by using multi-photon photoemission electron microscopy (MP-PEEM). We propose an interpretation that the chiral NF distribution is extrinsically generated on an achiral metallic nanostructure by the interference between two plasmonic modes by combining the state-of-the-art MP-PEEM techniques and classical oscillator model.
Additionally, by using time-resolved PEEM, the origin of chirality in plasmonic nanostructures could be directly revealed in the space and time domains with nanofemto scale resolution. The dynamic information on plasmonic modes, such as the resonance frequency and dephasing time for left and right CPL excitations were obtained by applying the interferometric time-resolved pump－probe technique, providing direct evidence for the spatiotemporal origin of chirality.
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