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Design for Hybrid Circular Bragg Gratings for a Highly Efficient Quantum-Dot Single-Photon Source
Beimeng Yao,Rongbin Su,Yuming Wei,Zhuojun Liu,Tianming Zhao,Jin Liu 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.73 No.10
We present a design for hybrid circular Bragg gratings (hCBGs) for eciently extracting singlephotons emitted by InAs quantum dots (QDs) embedded in GaAs. Finite-difference time-domain simulations show that a very high photon collection eciency (PCE) up to 96% over a 50 nm bandwidth and pronounced Purcell factors up to 19 at cavity resonance are obtained. We also systematically investigate the geometry parameters, including the SiO2 thickness, grating period, gap width and the central disk radius, to improve the device performances. Finally, the PCEs and the Purcell factors of QDs located at different positions of the hCBG are studied, and the results show great robustness against uncertainties in the location of the QD.