Quantum emitter dipole–dipole interactions in nanoplasmonic systems

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.

Mie excitons: Understanding strong coupling in dielectric nanoparticles

“…Plasmons, in particular, are frequently combined with classical and quantum emitters, and are acknowledged as excellent templates for sensing [8,9], fluorescence [10,11] and Raman enhancement [12], and optical communications [13,14]. Recently, strong coupling of emitters with surface plasmon polaritons in metal films or localised surface plasmons in nanoparticles (NPs) has turned into a rapidly growing field, due to its potential for applications in quantum optics [15][16][17][18]. In so-called plexcitonic architectures, plasmons confine light to small volumes that largely overcome the diffraction limit [19], dramatically enhancing the coupling strength and enabling lightmatter interactions to enter the strong coupling regime, which is characterised by Rabi oscillations in the emitter occupation and hybrid optical states of mixed lightmatter nature [20][21][22][23][24][25].…”

Loss-Driven Topological Transitions in Lasing

“…We use plasmonic nanoparticle arrays due to their strong dipole moments in the nanoparticles [33][34][35][36][37][38]. The lasing mode is identified by using theory of coupled dipoles together with group theory and T-matrix calculations [39,40]. We show that the energy of the modes as well as their loss properties change as the structural parameter is varied.…”

“…We have employed T-matrix calculations [39,40] (see also [41]) to explain why there are four regimes in which the lasing mode corresponds to a different IR. We obtain the energy of the modes at the Γ point, by varying t in the experimentally relevant parameter range, and plot their real and imaginary parts in the complex plane, in Fig.…”

Multimode Organic Polariton Lasing

“…The operator a † k creates a photon with wave vector k and energy ω k , and the lightmatter coupling has strength g n;k ; these are discussed in detail below. We ignore hopping of excitons between molecules as delocalization through coupling to light dominates over hopping [22,32].…”