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We demonstrate optical coupling between a single tin-vacancy (SnV) center indiamond and a free-standing photonic crystal nanobeam cavity. The cavities arefabricated using quasi-isotropic etching and feature experimentally measuredquality factors as high as ~11,000. We investigate the dependence of a singleSnV center's emission by controlling the cavity wavelength using alaser-induced gas desorption technique. Under resonance conditions, we observean intensity enhancement of the SnV emission by a factor of 12 and a 16-foldreduction of the SnV lifetime. Based on the large enhancement of the SnVemission rate inside the cavity, we estimate the Purcell factor for the SnVzero-phonon line to be 37 and the coupling efficiency of the SnV center to thecavity, the beta factor, to be 95%. Our work paves the way for the realizationof quantum photonic devices and systems based on efficient photonic interfacesusing the SnV color center in diamond.

Coupling of a Single Tin-vacancy Center to a Photonic Crystal Cavity in Diamond