Molecular Plasmonics: strong coupling at the low molecular density limit

TL;DR

This paper demonstrates that strong coupling between molecular excited states and plasmonic modes can be achieved at low molecular densities in silver hole arrays, especially within the nonlinear dispersion regime, with minimal electromagnetic damping.

Contribution

It reveals that strong coupling occurs in the nonlinear dispersion regime at low molecular densities, supported by rigorous numerical simulations.

Findings

Strong coupling achieved at low molecular densities

Nonlinear dispersion regime is critical for strong coupling

Negligible damping observed in the electromagnetic field

Abstract

We study the strong coupling between the molecular excited state and the plasmonic modes of silver hole arrays with a resonant frequency very close to the asymptotic line of the plasmonic dispersion relation, at the nonlinear regime. We demonstrate that the strong coupling regime can be achieved between the two sub-systems at low molecular densities with negligible damping of the electromagnetic field. Our results are supported by rigorous numerical simulations showing that the strong coupling is observed when the molecular transition lies within the nonlinear regime of the dispersion relation rather than the linear regime.