Femtosecond imaging of spatial deformation of surface plasmon polariton wave packet during resonant interaction with nanocavity

Nanophotonics

Kubo Atsushi¹  Otake Yuka²  Ichiji Naoki² 

[1] Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tenno-dai, Tsukuba-shi, Ibaraki, 305-8571, Japan;Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba-shi, Ibaraki, 305-8571, Japan;

关键词: femtosecond;    metamaterial;    nanocavity;    surface plasmon;    time-resolved microscopy;    wave packet;   

DOI  :  10.1515/nanoph-2021-0740

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown