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The demonstration of enhanced spontaneous emission of nanoscaled opticalemitters near metallic nanoparticles and the recent realization of a nanolaserbased on surface plasmon amplification by stimulated emission of radiation(spaser) encourage the search for strong coupling regime at the nanoscale. Herewe propose the concept of nanopolaritons. We demonstrate with accuratescattering calculations that the strong coupling regime of a single quantumemitter (a semiconductor quantum dot) placed in the gap between two metallicnanoparticles can be achieved. The largest dimension of the investigated systemis only 36 nm. Nanopolaritons will advance our fundamental understanding ofsurface plasmon enhanced optical interactions and could be used asultra-compact elements in quantum-information technology.

Nanopolaritons: Vacuum Rabi splitting with a single quantum dot in the center of a dimer nanoantenna