Abstract
There is an increasing scientific and technological interest on the design and implementation of nanoscale sources of quantum light. Here, we investigate the quantum statistics of the light scattered from a plasmonic nanocavity coupled to a mesoscopic ensemble of emitters under low coherent pumping. We present an analytical description of the intensity correlations taking place in these systems, and unveil the fingerprint of plasmon-exciton-polaritons in them. Our findings reveal that plasmonic cavities are able to retain and enhance excitonic nonlinearities even when the number of emitters is large. This makes plasmonic strong coupling a promising route for generating nonclassical light beyond the single emitter level.
Highlights
Much research attention has focused lately on plasmonic nanocavities for strong coupling applications
We develop an analytical description of the quantum optical properties of the system that allows us to reveal that, contrary to what is expected, plasmonic cavities enhance photon correlations in quantum emitters (QEs) ensembles of considerable size under strong coupling conditions
For proof-of-principle purposes, we have chosen QE parameters as: ωQE = 3 eV, γQr E = 6 μeV, and γQnrE = 15 meV. These values correspond to organic molecules that display very low quantum yield and in which collective strong coupling has been already reported [3, 13]. This type of QEs are favorable for generating photon correlations
Summary
Much research attention has focused lately on plasmonic nanocavities for strong coupling applications. In this Article, we fill this gap by investigating the quantum statistics of the photons scattered by a nanocavity strongly coupled to a mesoscopic emitter ensemble (up to ∼ 100 QEs) under coherent pumping. We develop an analytical description of the quantum optical properties of the system that allows us to reveal that, contrary to what is expected, plasmonic cavities enhance photon correlations in QE ensembles of considerable size under strong coupling conditions.
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