Monolithic Integration of Single Quantum Emitters in hBN Bullseye Cavities
Lesley Spencer, Jake Horder, Sejeong Kim, Milos Toth, Igor Aharonovich
Abstract
The ability of hexagonal boron nitride to host quantum emitters in the form of deep-level color centers makes it an important material for quantum photonic applications. This work utilizes a monolithic circular Bragg grating device to enhance the collection of single photons with a 436 nm wavelength emitted from quantum emitters in hexagonal boron nitride. We observe a 6-fold increase in collected intensity for a single-photon emitter coupled to a device compared to an uncoupled emitter and show exceptional spectral stability at cryogenic temperature. The devices were fabricated by using a number of etching methods, beyond standard fluorine-based reactive ion etching, and the quantum emitters were created by using a site-specific electron beam irradiation technique. Our work demonstrates the potential of monolithically integrated systems for deterministically placed quantum emitters using a variety of fabrication options.