Post-fabrication tuning of circular Bragg resonators for enhanced emitter-cavity coupling

• URL: http://arxiv.org/abs/2309.15801v1
• Date: Wed, 27 Sep 2023 17:21:13 GMT
• Title: Post-fabrication tuning of circular Bragg resonators for enhanced emitter-cavity coupling
• Authors: Tobias M. Krieger, Christian Weidinger Thomas Oberleitner Gabriel Undeutsch, Michele B. Rota, Naser Tajik, Maximilian Aigner, Quirin Buchinger, Christian Schimpf, Ailton J. Garcia Jr., Saimon F. Covre da Silva, Sven H\"ofling, Tobias Huber-Loyola, Rinaldo Trotta, and Armando Rastelli
• Abstract summary: 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 enhancement of the emission of single embedded GaAs quantum dots.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• 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.

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