[16a-WL1_201-1~11] 3.1 Basic optics and frontier of optics

9:30 AM - 9:45 AM JST(12:30 AM - 12:45 AM UTC)

[16a-WL1_201-3] Near-field optical response on plasmonic array with chiral arrangement

〇Tomoya Oshikiri^1,2, Xu Shi^3,4, Lin Qiao^3,5, Yaolong Li³, Yen-En Liu³, Hiromasa Niinomi^1,2, Hiroaki Misawa^3,5,6, Masaru Nakagawa^1,2,7 (1.IMRAM, Tohoku Univ., 2.S-Hub, Tohoku Univ., 3.RIES Hokkaido Univ., 4.CRIS, Hokkaido Univ., 5.RIIS, Okayama Univ., 6.CEFMS, NYCU, 7.ePhotonic Meta Sensing Co-Creation Research Center, Tohoku Univ.)

Keywords:

chirality,near field,plasmon

This study aimed to induce chiroptical responses in a cluster of isotropic plasmonic particles arranged in a chiral configuration. The formation of collective modes is expected through modal coupling between the LSPRs and Fabry–Pérot nanocavity modes. We designed a cluster of isotropic gold nanodisks (Au-NDs) with a chiral configuration, termed the Au nanowindmill (Au-NW), situated on an FP nanocavity. The chiroptical responses in far-field were estimated by comparing the spectral properties of the identical cluster under left- and right-handed CPL (LCPL and RCPL) irradiations. The near-field properties of Au-NWs were also investigated. Photoemission electron microscopy (PEEM) captures the photoelectrons emitted from a surface of the sample following the absorption of incident photons. Notably, by analyzing the differences in PE signal under LCPL and RCPL irradiations, the chiral spatial distribution of the near-field intensity and its spectrum can be elucidated.