Post-fabrication tuning of circular Bragg resonators for enhanced emitter-cavity coupling
arXiv:2309.15801 · doi:10.1021/acsphotonics.3c01480
Abstract
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.
References in corpus (13)
- The Quantum Internet
- A solid-state entangled photon pair source with high brightness and indistinguishability
- On-demand semiconductor source of entangled photons which simultaneously has high fidelity, efficiency, and indistinguishability
- Three megahertz photon collection rate from an NV center with millisecond spin coherence
- High-fidelity transmission of entanglement over a high-loss freespace channel
- Coupling spin defects in hexagonal boron nitride to monolithic bullseye cavities
- Bright Purcell enhanced single-photon source in the telecom O-band based on a quantum dot in a circular Bragg grating
- GaAs quantum dots grown by droplet etching epitaxy as quantum light sources
- Two-photon interference from independent cavity-coupled emitters on-a-chip
- Dynamically controlling the emission of single excitons in photonic crystal cavities
- High performance single-photon sources at telecom wavelength based on broadband hybrid circular Bragg gratings
- Optical properties of circular Bragg gratings with labyrinth geometry to enable electrical contacts
- Optical transparency induced by a largely Purcell-enhanced quantum dot in a polarization-degenerate cavity