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The strong interaction of individual quantum emitters with resonant cavitiesis of fundamental interest for understanding light matter interactions.Plasmonic cavities hold the promise of attaining the strong coupling regimeeven under ambient conditions and within subdiffraction volumes. Recentexperiments revealed strong coupling between individual plasmonic structuresand multiple organic molecules, but so far strong coupling at the limit of asingle quantum emitter has not been reported. Here we demonstrate vacuum Rabisplitting, a manifestation of strong coupling, using silver bowtie plasmoniccavities loaded with semiconductor quantum dots (QDs). A transparency dip isobserved in the scattering spectra of individual bowties with one to a few QDs,directly observed in their gaps. A coupling rate as high as 120 meV isregistered even with a single QD, placing the bowtie-QD constructs close to thestrong coupling regime. These observations are verified bypolarization-dependent experiments and validated by electromagneticcalculations.

Vacuum Rabi splitting in a plasmonic cavity at the single quantum emitter limit