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arXiv · 1902.09676

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

Tigran V. Shahbazyan
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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.

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Tigran V. Shahbazyan. 2019-02-26. Exciton-plasmon energy exchange drives the transition to strong coupling regime. https://doi.org/10.1021/acs.nanolett.9b00827

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