Open AccessUltrafast plasmon polaritons doubly resonant on a single silver nanoshell
Author(s) -
Jian Zhang,
Xinping Zhang
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.017061
Subject(s) - nanoshell , materials science , plasmon , optics , grating , surface plasmon polariton , surface plasmon resonance , polariton , surface plasmon , optoelectronics , reflection (computer programming) , ultrashort pulse , laser , physics , nanotechnology , nanoparticle , computer science , programming language
Ultrafast surface plasmon polaritons (SPPs) were observed in a silver nanoshell grating, which was produced by depositing a roughly sinusoidal dielectric grating with a continuous layer of silver. Two SPP modes were observed to propagate along the top and bottom surfaces of the silver nanoshell, modulating the reflection spectra in the space above and below the silver nanoshell, respectively. These two SPP modes are located independently at a shorter and a longer wavelength, exciting the asymmetric and symmetric oscillation of the plasmonic electrons, respectively. The asymmetric mode was excited by the diffraction anomaly along the silver/air interface, whereas, the symmetric by the waveguide mode within the ITO grating layer, which was defined by the high reflection at the ITO/silver interface and the total reflection at the ITO/substrate interface. Different optical switching performance with different lifetimes was measured for the two resonance modes.