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

TL;DR

This paper demonstrates the optical coupling of a single tin-vacancy center in diamond with a high-Q photonic crystal cavity, achieving significant emission enhancement and efficient coupling, advancing quantum photonic device development.

Contribution

It reports the first integration of a SnV center with a photonic crystal cavity in diamond, achieving high Purcell factor and coupling efficiency.

Findings

Emission enhancement factor of 12 at resonance

Lifetime reduction by a factor of 16

Estimated Purcell factor of 37 and beta factor of 95%

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 beta 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.