基于电控圆形布拉格光栅中量子点的光纤尾纤式量子光源高性能设计
High-performance designs for fiber-pigtailed quantum-light sources based on quantum dots in electrically-controlled circular Bragg gratings
AI总结：
本文数值优化电控混合圆形布拉格光栅量子光源，使其可直接耦合光纤并覆盖930 nm及电信O、C波段，在制造公差下仍保持高耦合效率、高Purcell因子和量子点Stark调谐所需电场。
摘要：
我们对直接光纤耦合的混合圆形布拉格光栅（CBG）进行了数值研究，这些器件具有电控功能，可工作于约930 nm以及电信O波段和C波段等应用相关波长范围。我们采用代理模型结合贝叶斯优化方法，对器件性能进行数值优化，并将其对制造公差的稳健性纳入考虑。所提出的高性能设计将hCBG与介质平坦化及透明接触材料相结合，可实现超过86%的直接光纤耦合效率（在NA 0.8下效率最高超过93%），同时Purcell因子大于20。尤其是所提出的电信波段设计表现出稳健性：在采用保守制造精度的假设下，可维持超过(82.2±4.1)^{+2.2}_{-5.5}%的预期光纤效率，以及最高(23.2±2.3)^{+3.2}_{-3.0}的预期平均Purcell因子。最大Purcell增强对应的波长被证明是受偏差影响最大的性能参数。最后，我们表明，在所确定的设计中，可以达到适用于嵌入式量子点Stark调谐的电场强度。
英文摘要：
We present a numerical investigation of directly fiber-coupled hybrid circular Bragg gratings (CBGs) featuring electrical control for operation in the application relevant wavelength regimes around 930 nm as well as the telecom O- and C-band. We use a surrogate model combined with a Bayesian optimization approach to perform numerical optimization of the device performance which takes into account robustness with respect to fabrication tolerances. The proposed high-performance designs combine hCBGs with a dielectric planarization and a transparent contact material, enabling >86% direct fiber coupling efficiency (up to >93% efficiency into NA 0.8) while exhibiting Purcell Factors >20. Especially the proposed designs for the telecom range prove robust and can sustain expected fiber efficiencies of more than $(82.2\pm4.1)^{+2.2}_{-5.5}$% and expected average Purcell Factors of up to $(23.2\pm2.3)^{+3.2}_{-3.0}$ assuming conservative fabrication accuracies. The wavelength of maximum Purcell enhancement proves to be the most affected performance parameter by the deviations. Finally, we show that electrical field strengths suitable for Stark-tuning of an embedded quantum dot can be reached in the identified designs.
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