Quantum emitter dipole-dipole interactions in nanoplasmonic systems

TL;DR

This paper develops a generalized model for two-level quantum emitters coupled to plasmonic modes, incorporating dipole-dipole interactions and randomness, to analyze spectral properties and identify dark modes in nanoplasmonic systems.

Contribution

It introduces a novel generalized Dicke-like model including direct dipole-dipole interactions and applies it to dye molecules near metallic nanoparticles.

Findings

Identification of dark modes through spectral analysis.

Insights into how dipole-dipole interactions influence energy spectra.

Classification of parameter regions where interactions significantly affect system behavior.

Abstract

We introduce a generalized Dicke-like model to describe two-level systems coupled with a single bosonic mode. In addition, the two-level systems mutually interact via direct dipole-dipole interaction. We apply the model to an ensemble of dye molecules coupled to a plasmonic excitation in a metallic nanoparticle and study how the dipole-dipole interaction and configurational randomness introduced to the system affect the energy spectra. Comparing the system eigenenergies obtained by our model with the light spectra from a multiple-scattering simulation, we suggest a way to identify dark modes in our model. Finally, we perform a parameter sweep in order to determine the scaling properties of the system and to classify the regions of the parameter space where the dipole-dipole interactions can have significant effects.