1 research outputs found
Postfabrication Tuning of Circular Bragg Resonators for Enhanced Emitter-Cavity Coupling
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 marginally affected in the explored tuning
range. We expect the method to be applicable also to circular Bragg
resonators based on other material platforms, thus increasing the
device yield of cavity-enhanced solid-state quantum emitters