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Revealing the Chiroptical Response of Plasmonic Nanostructures at the Nanofemto Scale

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Title: Revealing the Chiroptical Response of Plasmonic Nanostructures at the Nanofemto Scale
Authors: Zu, Shuai Browse this author
Sun, Quan Browse this author →KAKEN DB
Cao, En Browse this author
Oshikiri, Tomoya Browse this author →KAKEN DB
Misawa, Hiroaki Browse this author →KAKEN DB
Keywords: chiral plasmonics
photoemission electron microscopy
ultrafast optics
near-field imaging
nanofemto scale
Issue Date: 9-Jun-2021
Publisher: American Chemical Society
Journal Title: Nano letters
Volume: 21
Issue: 11
Start Page: 4780
End Page: 4786
Publisher DOI: 10.1021/acs.nanolett.1c01322
Abstract: The spatiotemporal origin of plasmonic chiroptical responses in nanostructures remains unexplored and unclear. Here, two orthogonally oriented Au nanorods as a prototype were investigated, with a giant chiroptical response caused by antisymmetric and symmetric mode excitations for obliquely incident left-handed circular polarization (LCP) and right-handed circular polarization (RCP) light. Time-resolved photoemission electron microscopy (PEEM) was employed to measure the near-field spatial distributions, spectra, and spatiotemporal dynamics of plasmonic modes associated with the chiroptical responses at the nanofemto scale, verifying the characteristic near-field distributions at the resonant wavelengths of the two modes and a very large spectral dichroism for LCP and RCP. More importantly, eigenmode excitations and their contributions to the ultrafast plasmonic chiroptical response in the space-time domain were directly revealed, promoting a full understanding of the ultrafast chiral origin in complex nanostructures. These findings open a way to design chiroptical nanophotonic devices for spatiotemporal control of chiral light-matter interactions.
Type: article
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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