Generation rate scaling: the quality factor optimization of microring resonators for photon-pair sources

作     者：KAI GUO XIAODONG SHI XIAOLIN WANG JUNBO YANG YUNHONG DING HAIYAN OU YIJUN ZHAO 

作者机构：College of Advanced Interdisciplinary StudiesNational University of Defense Technology Department of Photonics EngineeringTechnical University of Denmark Center of Material ScienceCollege of Liberal Arts and SciencesNational University of Defense Technology 

出 版 物：《Photonics Research》 (光子学研究（英文版）)

年 卷 期：2018年第6卷第6期

页      面：587-596页

核心收录：

学科分类：080901[工学-物理电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 

基　　金：National Natural Science Foundation of China(NSFC)(60907003) Natural Science Foundation of Hunan Province,China(13JJ3001) Program for New Century Excellent Talents in University(NCET),China(NCET-12-0142) Danmarks Grundforskningsfond(DNRF)(DNRF123) China Scholarship Council(CSC) 

主　　题：Nonlinear optics four-wave mixing Quantum optics Nonlinear optics devices 

摘      要：To achieve photon-pair generation scaling, we optimize the quality factor of microring resonators for efficient continuous-wave-pumped spontaneous four-wave mixing. Numerical studies indicate that a high intrinsic quality factor makes high pair rate and pair brightness possible, in which the maximums take place under overcoupling and critical-coupling conditions, respectively. We fabricate six all-pass-type microring resonator samples on a silicon-on-insulator chip involving gap width as the only degree of freedom. The signal count rate, pair brightness,and coincidence rate of all the samples are characterized, which are then compared with the modified simulations by taking the detector saturation and nonlinear loss into account. Being experimentally validated for the first time to the best of our knowledge, this work explicitly demonstrates that reducing the round-trip loss in a ring cavity and designing the corresponding optimized gap width are more effective to generate high-rate or high-brightness photon pairs than the conventional strategy of simply increasing the quality factor.