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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 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 |
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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.
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Received: 17 August 2021
Revised: 27 August 2021
Accepted manuscript online: 01 September 2021
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| Fund: 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). |
Corresponding Authors:
Yan-Xiao Gong
E-mail: gongyanxiao@nju.edu.cn
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Cite this article:
Guang-Tai Xue(薛广太), Xiao-Hui Tian(田晓慧), Chi Zhang(张弛), Zhenda Xie(谢臻达), Ping Xu(徐平), Yan-Xiao Gong(龚彦晓), and Shi-Ning Zhu(祝世宁) Effect of thickness variations of lithium niobate on insulator waveguide on the frequency spectrum of spontaneous parametric down-conversion 2021 Chin. Phys. B 30 110313
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