Regensburg 2025 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 36: Materials and Devices for Quantum Technology II
HL 36.9: Talk
Wednesday, March 19, 2025, 17:15–17:30, H13
Circular photonic crystal grating design for charge-tunable quantum light sources in the telecom C-band — •Chenxi Ma1, Jingzhong Yang1, Pengji Li1, Eddy Rugeramigabo1, Michael Zopf1, and Fei Ding1,2 — 1Leibniz University Hannover, Institute of Solid State Physics, Hannover, Germany — 2Leibniz University Hannover, Laboratory of Nano and Quantum Engineering, Hannover, Germany
Efficient generation of entangled photon pairs at telecom wavelengths is a key ingredient for long-range quantum networks. While embedding semiconductor quantum dots into hybrid circular Bragg gratings has proven effective, it conflicts with p-i-n diode heterostructures which offer superior coherence. We propose and analyze hybrid circular photonic crystal gratings, incorporating air holes to facilitate charge carrier transport without compromising optical properties. Through numerical simulations, a broad cavity mode with a Purcell factor of 23 enhancing both exciton and biexciton transitions, and exceptional collection efficiency of 92.4
Keywords: Quantum dot; Microcavity; Charge tuning