Design for Hybrid Circular Bragg Gratings for a Highly Efficient Quantum-Dot Single-Photon Source

被引：25
作者：
Yao, Beimeng [1 ]
Su, Rongbin [1 ]
Wei, Yuming [1 ]
Liu, Zhuojun [1 ]
Zhao, Tianming [1 ]
Liu, Jin [1 ]
机构：
[1] Sun Yat Sen Univ, Sch Phys, Guangzhou 510275, Guangdong, Peoples R China
来源：
JOURNAL OF THE KOREAN PHYSICAL SOCIETY | 2018年 / 73卷 / 10期
关键词：
Semiconductor quantum dots; Circular Bragg gratings; Single-photon source;
D O I：
10.3938/jkps.73.1502
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We present a design for hybrid circular Bragg gratings (hCBGs) for efficiently extracting single-photons emitted by InAs quantum dots (QDs) embedded in GaAs. Finite-difference time-domain simulations show that a very high photon collection efficiency (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.
引用
收藏
页码：1502 / 1505
页数：4
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