Purcell enhancement of a cavity-coupled emitter in hexagonal boron nitride

TL;DR

This paper demonstrates the enhancement of emission from a hexagonal boron nitride quantum emitter by integrating it into a nanophotonic cavity, achieving Purcell enhancement and resonant tuning at cryogenic temperatures.

Contribution

It presents the first demonstration of Purcell enhancement of a hBN quantum emitter coupled to a photonic crystal cavity with resonant tuning via gas condensation.

Findings

Achieved Purcell factor of approximately 15.

Resonant coupling of the emitter's zero phonon line to the cavity mode.

Demonstrated emission enhancement and lifetime reduction.

Abstract

Integration of solid state quantum emitters into nanophotonic circuits is a critical step towards fully on-chip quantum photonic based technologies. Among potential materials platforms, quantum emitters in hexagonal boron nitride have emerged over the last years as viable candidate. While the fundamental physical properties have been intensively studied over the last years, only few works have focused on the emitter integration into photonic resonators. Yet, for a potential quantum photonic material platform, the integration with nanophotonic cavities is an important cornerstone, as it enables the deliberate tuning of the spontaneous emission and the improved readout of distinct transitions for that quantum emitter. In this work, we demonstrate the resonant tuning of an integrated monolithic hBN quantum emitter in a photonic crystal cavity through gas condensation at cryogenic temperature. We resonantly coupled the zero phonon line of the emitter to a cavity mode and demonstrate emission enhancement and lifetime reduction, with an estimation for the Purcell factor of ~ 15.