Exciton-plasmon energy exchange drives the transition to strong coupling regime

Abstract

We present a model for exciton-plasmon coupling based on an energy exchange mechanism between quantum emitters (QE) and localized surface plasmons in metal-dielectric structures. Plasmonic correlations between QEs give rise to a collective state exchanging its energy cooperatively with a resonant plasmon mode. By defining carefully the plasmon mode volume for a QE ensemble, we obtain a relation between QE-plasmon coupling and a cooperative energy transfer rate that is expressed in terms of local fields. For a single QE near a sharp metal tip, we find analytically the enhancement factor for QE-plasmon coupling relative to QE coupling to a cavity mode. For QEs distributed in an extended region enclosing a plasmonic structure, we find that the ensemble QE-plasmon coupling saturates to a universal value independent of system size and shape, consistent with the experiment.

8 pages, 4 figures

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• Realizing strong light-matter interactions between single nanoparticle plasmons and molecular excitons at ambient conditions
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Cited by in corpus (7)

• On the applicability of quantum-optical concepts in strong-coupling nanophotonics
• Plasmon-induced coherence, exciton-induced transparency and Fano interference for hybrid plasmonic systems in strong coupling regime
• Exciton-induced transparency in hybrid plasmonic systems
• Interacting quantum plasmons in metal-dielectric structures
• Non-Markovian effects for hybrid plasmonic systems in the strong coupling regime
• Universal optical polarizability for plasmonic nanostructures
• Purcell factor for plasmon-enhanced metal photoluminescence