• Chinese Optics Letters
  • Vol. 19, Issue 6, 060014 (2021)
Rui Ge, Xiongshuo Yan, Yuping Chen*, and Xianfeng Chen
Author Affiliations
  • State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
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    We investigate the influences of structure parameters and interface shapes on the bandwidth of the edge state of lithium niobate valley photonic crystals. By increasing the size difference of two air holes in the same unit cell, we find that the bandwidth of the lossless nontrivial edge state possesses a peak value of 0.0201(a/λ), which can be used to construct broadband valley photonic crystal waveguides. Mode field distributions verify that the waveguide is robust against sharp bends and exhibits chirality. When the unit cell is arranged in a bearded interface with the top and bottom components showing negative and positive valley Chern numbers, respectively, we find that the lithium niobate valley photonic crystal is more likely to exhibit a lossless edge state, which is difficult to be realized in valley waveguides with low refractive index materials. This work can provide guidance on the design of the high-performance topological waveguide.

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    Rui Ge, Xiongshuo Yan, Yuping Chen, Xianfeng Chen. Broadband and lossless lithium niobate valley photonic crystal waveguide [Invited][J]. Chinese Optics Letters, 2021, 19(6): 060014
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    Category: Special Issue on Lithium Niobate Based Photonic Devices
    Received: Apr. 6, 2021
    Accepted: Apr. 30, 2021
    Published Online: Jun. 16, 2021
    The Author Email: Yuping Chen (ypchen@sjtu.edu.cn)