Open AccessTunable strong exciton–plasmon–exciton coupling in WS2–J-aggregates–plasmonic nanocavity
Author(s) -
Ping Jiang,
Gang Song,
Yilin Wang,
Chao Li,
Lulu Wang,
Li Yu
Publication year - 2019
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.016613
Subject(s) - exciton , plasmon , j aggregate , finite difference time domain method , coupling (piping) , localized surface plasmon , scattering , surface plasmon , materials science , optoelectronics , molecular physics , physics , condensed matter physics , optics , metallurgy
A coupling system is proposed to active control of strong exciton-plasmon-exciton coupling, which consists of a silver nanoprism separated from a monolayer WS 2 by J-aggregates. The scattering spectrum of the hybrid system calculated by the finite-difference time-domain (FDTD) method is well reproduced by the coupled oscillator model theory. The calculation results show that strong couplings among WS 2 excitons, J-aggregate excitons, and localized surface plasmon resonances (LSPRs) are achieved in the hybrid nanostructure, and result in three plexciton branches. We further analyze the exciton-plasmon-exciton coupling behaviors and obtain the weighting efficiencies of the original modes in three plexciton branches. The strong couplings between two different excitons and LSPRs can be active manipulated by tuning the temperature or the concentration of J-aggregates. The proposed systems make up a simple platform for the dynamic control of exciton-plasmon-exciton couplings and have potential applications in optical modulators at the nanoscale.