中国物理B ›› 2021, Vol. 30 ›› Issue (11): 110313-110313.doi: 10.1088/1674-1056/ac22a1

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Effect of thickness variations of lithium niobate on insulator waveguide on the frequency spectrum of spontaneous parametric down-conversion

Guang-Tai Xue(薛广太)1, Xiao-Hui Tian(田晓慧)1, Chi Zhang(张弛)1, Zhenda Xie(谢臻达)1, Ping Xu(徐平)2, Yan-Xiao Gong(龚彦晓)1,†, and Shi-Ning Zhu(祝世宁)1   

  1. 1 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;
    2 Institute for Quantum Information and State Key Laboratory of High Performance Computing, College of Computing, National University of Defense Technology, Changsha 410073, China
  • 收稿日期:2021-08-17 修回日期:2021-08-27 接受日期:2021-09-01 出版日期:2021-10-13 发布日期:2021-11-06
  • 通讯作者: Yan-Xiao Gong E-mail:gongyanxiao@nju.edu.cn
  • 基金资助:
    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), and the National Natural Science Foundation of China (Grant Nos. 51890861, 11690031, 11974178, and 11627810).

Effect of thickness variations of lithium niobate on insulator waveguide on the frequency spectrum of spontaneous parametric down-conversion

Guang-Tai Xue(薛广太)1, Xiao-Hui Tian(田晓慧)1, Chi Zhang(张弛)1, Zhenda Xie(谢臻达)1, Ping Xu(徐平)2, Yan-Xiao Gong(龚彦晓)1,†, and Shi-Ning Zhu(祝世宁)1   

  1. 1 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;
    2 Institute for Quantum Information and State Key Laboratory of High Performance Computing, College of Computing, National University of Defense Technology, Changsha 410073, China
  • Received:2021-08-17 Revised:2021-08-27 Accepted:2021-09-01 Online:2021-10-13 Published:2021-11-06
  • Contact: Yan-Xiao Gong E-mail:gongyanxiao@nju.edu.cn
  • Supported by:
    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), and the National Natural Science Foundation of China (Grant Nos. 51890861, 11690031, 11974178, and 11627810).

摘要: We study the effect of waveguide thickness variations on the frequency spectrum of spontaneous parametric down-conversion 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.

关键词: lithium niobate on insulator, spontaneous parametric down-conversion, waveguide thickness variation, frequency spectrum

Abstract: We study the effect of waveguide thickness variations on the frequency spectrum of spontaneous parametric down-conversion 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.

Key words: lithium niobate on insulator, spontaneous parametric down-conversion, waveguide thickness variation, frequency spectrum

中图分类号:  (Quantum information)

  • 03.67.-a
42.50.-p (Quantum optics) 42.82.-m (Integrated optics) 42.65.-k (Nonlinear optics)