Femtosecond imaging of spatial deformation of surface plasmon polariton wave packet during resonant interaction with nanocavity
| Autor: | Ichiji Naoki, Otake Yuka, Kubo Atsushi |
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| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Nanophotonics, Vol 11, Iss 7, Pp 1321-1333 (2022) |
| Druh dokumentu: | article |
| ISSN: | 2192-8614 49047418 |
| DOI: | 10.1515/nanoph-2021-0740 |
| Popis: | The spatiotemporal dynamics of a surface plasmon polariton (SPP) wave packet (WP) that interacts with a plasmonic nanocavity on a metal surface are investigated via femtosecond time-resolved two-photon fluorescence microscopy and numerical calculations. The nanocavity, which consists of a metal–insulator–metal (MIM) laminar structure (longitudinal length: ∼100 nm), behaves as a subwavelength meta-atom possessing discretized eigenenergies. When a chirp-induced femto-second SPP WP is incident on the nanocavity, only the spectral component matching a particular eigenenergy is transmitted to continue propagation on the metal surface. This spectral clipping induces a spatial peak shift in the WP. The shift can be controlled by tuning the eigenenergy or chirp. |
| Databáze: | Directory of Open Access Journals |
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