Transition to strong coupling regime in hybrid plasmonic systems: Exciton-induced transparency and Fano interference

Tigran V. Shahbazyan

Published 2021-06-14Version 1

We present a microscopic model describing the transition to strong coupling regime for an emitter resonantly coupled to a surface plasmon in a metal-dielectric structure. We obtain the effective optical polarizability of such a hybrid system with the coupling parameter expressed in terms of energy transfer rates. In the weak coupling regime, the scattering spectra exhibit exciton-induced transparency minimum caused by energy exchange imbalance between the emitter and plasmon in a narrow frequency interval. We demonstrate that Fano interference, which emerges from the interactions of plasmon dipole and plasmon-induced emitter dipole with the radiation field in the final state of optical transition, can strongly affect the overall shape of scattering spectra leading to inversion of the asymmetry pattern as the system transitions to strong coupling regime.