Coupling Spin Defects in Hexagonal Boron Nitride to Titanium Oxide Ring Resonators

TL;DR

This paper demonstrates the integration of spin defects in hexagonal boron nitride with TiO2 ring resonators to enhance emission and enable quantum technology applications.

Contribution

It introduces a practical method for coupling 2D material spin defects with dielectric resonators, advancing quantum device integration.

Findings

Efficient coupling of boron vacancy emission into whispering gallery modes.

Observation of photoluminescence contrast in optically detected magnetic resonance.

Demonstration of a platform for quantum technologies using hybrid devices.

Abstract

Spin-dependent optical transitions are attractive for a plethora of applications in quantum technologies. Here we report on utilization of high quality ring resonators fabricated from TiO2 to enhance the emission from negatively charged boron vacancies in hexagonal Boron Nitride. We show that the emission from these defects can efficiently couple into the whispering gallery modes of the ring resonators. Optically coupled boron vacancy showed photoluminescence contrast in optically detected magnetic resonance signals from the hybrid coupled devices. Our results demonstrate a practical method for integration of spin defects in 2D materials with dielectric resonators which is a promising platform for quantum technologies.