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20 August 2020 Transition to strong coupling regime for quantum emitters coupled to a plasmonic resonator
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Abstract
We present a model for exciton-plasmon coupling based on 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 the QE-plasmon coupling and the 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 the QE-plasmon coupling relative to the 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 on system size and shape, consistent with the experiment.
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D. T. Latiker and T. V. Shahbazyan "Transition to strong coupling regime for quantum emitters coupled to a plasmonic resonator", Proc. SPIE 11460, Metamaterials, Metadevices, and Metasystems 2020, 114600U (20 August 2020); https://doi.org/10.1117/12.2568079
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