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Extrinsic Chirality by Interference between Two Plasmonic Modes on an Achiral Rectangular Nanostructure
| Title: | Extrinsic Chirality by Interference between Two Plasmonic Modes on an Achiral Rectangular Nanostructure |
| Authors: | Oshikiri, Tomoya Browse this author →KAKEN DB | | Sun, Quan Browse this author →KAKEN DB | | Yamada, Hiroki Browse this author | | Zu, Shuai Browse this author | | Sasaki, Keiji Browse this author →KAKEN DB | | Misawa, Hiroaki Browse this author →KAKEN DB |
| Keywords: | chirality | | localized surface plasmon resonance | | photoemission electron microscopy | | near-field imaging | | mode interference |
| Issue Date: | 26-Oct-2021 |
| Publisher: | American Chemical Society |
| Journal Title: | ACS nano |
| Volume: | 15 |
| Issue: | 10 |
| Start Page: | 16802 |
| End Page: | 16810 |
| Publisher DOI: | 10.1021/acsnano.1c07137 |
| Abstract: | The optical near field (NF) induced by circularly polarized light (CPL) is a hot scientific topic. We observed a chiral NF intensity distribution on a series of achiral gold nanorectangular structures (Au-NRs) under CPL irradiation by using multiphoton photoemission electron microscopy (MP-PEEM). Additionally, the differential NF spectra under left and right CPL irradiation, which represent the asymmetry of the NF intensity distribution, were investigated. We propose an interpretation that the chiral NF intensity distribution on an achiral metallic nanostructure is extrinsically generated by the interference between two plasmonic modes by combining state-of-the-art MP-PEEM techniques and the classical oscillator model. Our interpretation well explains both the experimental and simulation results. Furthermore, the intensity of the NF and its phase angle of each mode under linearly polarized light irradiation were revealed to be critical factors for the generation of extrinsic chirality in the NF intensity distribution. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/83432 |
| Appears in Collections: | 電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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