摘要
We study the effect of waveguide thickness variations on the frequency spectrum of spontaneous parametric downconversion in the periodically-poled lithium niobate on insulator(LNOI)waveguide.We analyze several variation models and our simulation results show that thickness variations in several nanometers can induce distinct effects on the central peak of the spectrum,such as narrowing,broadening,and splitting.We also prove that the effects of positive and negative variations can be canceled and thus lead to a variation-robust feature and an ultra-broad bandwidth.Our study may promote the development of on-chip photon sources in the LNOI platform,as well as opens up a way to engineer photon frequency state.
作者
薛广太
田晓慧
张弛
谢臻达
徐平
龚彦晓
祝世宁
Guang-Tai Xue;Xiao-Hui Tian;Chi Zhang;Zhenda Xie;Ping Xu;Yan-Xiao Gong;Shi-Ning Zhu(National Laboratory of Solid State Microstructures,School of Physics,School of Electronic Science and Engineering,College of Engineering and Applied Sciences,and Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China;Institute for Quantum Information and State Key Laboratory of High Performance Computing,College of Computing,National University of Defense Technology,Changsha 410073,China)
基金
Project supported by the National Key R&D Program of China(Grant No.2019YFA0705000)
Leading-edge Technology Program of Jiangsu Natural Science Foundation,China(Grant No.BK20192001)
the National Natural Science Foundation of China(Grant Nos.51890861,11690031,11974178,and 11627810).
