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High temporal stability and spin dynamics of individual nitrogen-vacancy (NV)centers in diamond crystals make them one of the most promising quantumemitters operating at room temperature. We demonstrate a chip-integratedcavity-coupled emission into propagating surface plasmon polariton (SPP) modesnarrowing NV center's broad emission bandwidth with enhanced couplingefficiency. The cavity resonator consists of two distributed Bragg mirrors thatare built at opposite sides of the coupled NV emitter and are integrated with adielectric-loaded SPP waveguide (DLSPPW), using electron-beam lithography ofhydrogen silsesquioxane resist deposited on silver-coated silicon substrates. Aquality factor of ~ 70 for the cavity (full width at half maximum ~ 10 nm) withfull tunability of the resonance wavelength is demonstrated. An up to 42-folddecay rate enhancement of the spontaneous emission at the cavity resonance isachieved, indicating high DLSPPW mode confinement.

Chip-integrated plasmonic cavity-enhanced single nitrogen-vacancy center emission