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Title: | Second-order topological phases in C4v-symmetric photonic crystals beyond the two-dimensional Su-Schrieffer–Heeger model | Authors: | Chen, Y Lan, Z Zhu, J |
Issue Date: | Mar-2022 | Source: | Nanophotonics, Mar. 2022, v. 11, no. 7, p. 1345-1354 | Abstract: | Second-order photonic topological insulators (SPTIs) with topologically protected corner states provide a unique platform for realizing the robust manipulation of light in lower dimensions. Previous SPTIs proposed in C4v-symmetric lattices are mainly based on the two-dimensional (2D) Su-Schrieffer-Heeger (SSH) model consisting of an even number of sites in the unit cell. Moreover, second-order topological phases within high-order band gaps are rarely explored. Here, we propose a new principle of SPTIs beyond the 2D SSH model, which is realized in C4v-symmetric lattices consisting of an odd number of sites in the unit cell. The midgap-gap-ratios of these odd-order band gaps, from the first-order to the nineteenth-order with step of two-order, are maximized by the method of topology optimization. Second-order topological phases are successfully created within these sizeable band gaps and highly localized corner states are observed. Our work offers a new route for exploring high-order topological states in photonics and other classical systems. | Keywords: | Inverse design Odd-order band gap Photonic crystal Second-order topological insulators |
Publisher: | De Gruyter | Journal: | Nanophotonics | ISSN: | 2192-8606 | EISSN: | 2192-8614 | DOI: | 10.1515/nanoph-2021-0762 | Rights: | © 2022 Yafeng Chen et al., published by De Gruyter. This work is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). The following publication Chen, Y., Lan, Z., & Zhu, J. (2022). Second-order topological phases in C 4v-symmetric photonic crystals beyond the two-dimensional Su-Schrieffer–Heeger model. Nanophotonics, 11(7), 1345-1354 is available at https://doi.org/10.1515/nanoph-2021-0762. |
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