Solid-state quantum emitters embedded in circular Bragg resonators are
attractive due to their ability to emit quantum states of light with high
brightness and low multi-photon 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 ~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