Revealing the Chiroptical Response of Plasmonic Nanostructures at the Nanofemto Scale
| Autor: | En Cao, Hiroaki Misawa, Tomoya Oshikiri, Quan Sun, Shuai Zu |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Nanophotonics
Physics::Optics Bioengineering 02 engineering and technology photoemission electron microscopy Normal mode near-field imaging General Materials Science nanofemto scale Circular polarization Plasmon Physics ultrafast optics business.industry Mechanical Engineering General Chemistry Dichroism 021001 nanoscience & nanotechnology Condensed Matter Physics Photoemission electron microscopy chiral plasmonics Optoelectronics Nanorod 0210 nano-technology business Ultrashort pulse |
| Zdroj: | Nano Letters. 21:4780-4786 |
| ISSN: | 1530-6992 1530-6984 |
| DOI: | 10.1021/acs.nanolett.1c01322 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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