Dipolar and Quadrupolar Excitons Coupled to a Nanoparticle-on-a-Mirror Cavity

Abstract

We investigate plasmon-emitter interactions in a nanoparticle-on-a-mirror cavity. We consider two different sorts of emitters, those that sustain dipolar transitions, and those hosting only quadrupolar, dipole-inactive, excitons. By means of a fully analytical two-dimensional transformation optics approach, we calculate the light-matter coupling strengths for the full plasmonic spectrum supported by the nanocavity. We reveal the impact of finite-size effects in the exciton charge distribution and describe the population dynamics in a spontaneous emission configuration. Pushing our model beyond the quasi-static approximation, we extract the plasmonic dipole moments, which enables us to calculate the far-field scattering spectrum of the hybrid plasmon-emitter system. Our findings, tested against fully numerical simulations, reveal the similarities and differences between the strong coupling phenomenology for bright and dark excitons in nanocavities.

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Cited by in corpus (8)

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• A theoretical perspective on molecular polaritonics
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• Few-mode Field Quantization for Multiple Emitters
• Plexcitonic quantum light emission from nanoparticle-on-mirror cavities
• Strong coupling out of the blue: an interplay of quantum emitter hybridization with plasmonic dark and bright modes
• Many-Body Entanglement in Solid-State Emitters
• Phonon-mediated dark to bright plasmon conversion