Postfabrication Tuning of Circular Bragg Resonators for Enhanced Emitter-Cavity Coupling.

ABSTRACT: Solid-state quantum emitters embedded in circular Bragg resonators are attractive due to their ability to emit quantum light with high brightness and low multiphoton probability. As for any emitter-microcavity system, fabrication imperfections limit the spatial and spectral overlap of the emitter with the cavity mode, thus limiting their coupling strength. Here, we show that an initial spectral mismatch can be corrected after device fabrication by repeated wet chemical etching steps. We demonstrate an ∼16 nm wavelength tuning for optical modes in AlGaAs resonators on oxide, leading to a 4-fold Purcell enhancement of the emission of single embedded GaAs quantum dots. Numerical calculations reproduce the observations and suggest that the achievable performance of the resonator is only margin

SUBMITTER: Krieger TM 

PROVIDER: S-EPMC10885778 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature