Coupling of a single tin-vacancy center to a photonic crystal cavity in diamond
Kazuhiro Kuruma (Harvard University)
Benjamin Pingault (Harvard University, TU Delft - QID/Taminiau Lab)
Cleaven Chia (Harvard University)
Dylan Renaud (Harvard University)
Patrick Hoffmann (Friedrich Schiller University Jena)
Satoshi Iwamoto (University of Tokyo)
Carsten Ronning (Friedrich Schiller University Jena)
Marko Lončar (Harvard University)
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Abstract
We demonstrate optical coupling between a single tin-vacancy (SnV) center in diamond and a free-standing photonic crystal nanobeam cavity. The cavities are fabricated using quasi-isotropic etching and feature experimentally measured quality factors as high as ∼11 000. We investigate the dependence of a single SnV center's emission by controlling the cavity wavelength using a laser-induced gas desorption technique. Under resonance conditions, we observe an intensity enhancement of the SnV emission by a factor of 12 and a 16-fold reduction of the SnV lifetime. Based on the large enhancement of the SnV emission rate inside the cavity, we estimate the Purcell factor for the SnV zero-phonon line to be 37 and the coupling efficiency of the SnV center to the cavity, the β factor, to be 95%. Our work paves the way for the realization of quantum photonic devices and systems based on efficient photonic interfaces using the SnV color center in diamond.