Strong coupling out of the blue: an interplay of quantum emitter hybridization with plasmonic dark and bright modes

Abstract

Strong coupling between a single quantum emitter and an electromagnetic mode is one of the key effects in quantum optics. In the cavity QED approach to plasmonics, strongly coupled systems are usually understood as single-transition emitters resonantly coupled to a single radiative plasmonic mode. However, plasmonic cavities also support non-radiative (or "dark") modes, which offer much higher coupling strengths. On the other hand, realistic quantum emitters often support multiple electronic transitions of various symmetry, which could overlap with higher order plasmonic transitions -- in the blue or ultraviolet part of the spectrum. Here, we show that vacuum Rabi splitting with a single emitter can be achieved by leveraging dark modes of a plasmonic nanocavity. Specifically, we show that a significantly detuned electronic transition can be hybridized with a dark plasmon pseudomode, resulting in the vacuum Rabi splitting of the bright dipolar plasmon mode. We develop a simple model illustrating the modification of the system response in the "dark" strong coupling regime and demonstrate single photon non-linearity. These results may find important implications in the emerging field of room temperature quantum plasmonics.

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Cited by in corpus (7)

• Plexcitonic quantum light emission from nanoparticle-on-mirror cavities
• Collective strong coupling in a plasmonic nanocavity
• Optical scattering imaging with sub-nanometer precision based on position-ultra-sensitive giant Lamb shift
• Coupling, lifetimes and "strong coupling" maps for single molecules at plasmonic interfaces
• Spatially resolved photon statistics of general nanophotonic systems
• Phonon-mediated dark to bright plasmon conversion
• Electromagnetic coupling between subradiant plasmons and dye molecular excitons analyzed by spectral changes in ultrafast surface-enhanced fluorescence