Disordered ensembles of strongly coupled single-molecule plasmonic picocavities as nonlinear optical metamaterials

• URL: http://arxiv.org/abs/2104.00852v2
• Date: Mon, 21 Feb 2022 00:54:25 GMT
• Title: Disordered ensembles of strongly coupled single-molecule plasmonic picocavities as nonlinear optical metamaterials
• Authors: Felipe Herrera and Marina Litinskaya
• Abstract summary: We propose to use molecular picocavity ensembles as macroscopic coherent nonlinear optical devices enabled by nanoscale strong coupling. For a realistic molecular disorder model, we demonstrate that cross-phase modulation of optical fields as weak as 10 kW/cm$2$ is feasible using dilute ensembles of molecular picocavities at room temperature.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We propose to use molecular picocavity ensembles as macroscopic coherent nonlinear optical devices enabled by nanoscale strong coupling. For a generic picocavity model that includes molecular and photonic disorder, we derive theoretical performance bounds for coherent cross-phase modulation signals using weak classical fields of different frequencies. We show that strong coupling of the picocavity {\it vacua} with a specific vibronic sideband in the molecular emission spectrum results in a significant variation of the effective refractive index of the metamaterial relative to a molecule-free scenario, due to a vacuum-induced Autler-Townes effect. For a realistic molecular disorder model, we demonstrate that cross-phase modulation of optical fields as weak as 10 kW/cm$^2$ is feasible using dilute ensembles of molecular picocavities at room temperature, provided that the confined vacuum is not resonantly driven by the external probe field}. Our work paves the way for the development of plasmonic metamaterials that exploit strong coupling for optical state preparation and quantum control.

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