Abstract
Recently, higher-order topological states have been widely researched due to its unique properties in manipulating the propagation of light. In this paper, we propose a square lattice photonic crystal composed of rhombic dielectric columns, and realize topological phase transition by lattice transformation without breaking the C4 symmetry. The topological edge states and topological corner states are demonstrated in the combination structures of two photonic crystals with different Zak phases. We also present a new method to make four nearly degenerate topological corner states having larger frequency difference and construct a waveguide–cavity coupling system based on topological photonic crystals to realize the multifunction of topological optical switch and controllable optical storage. Our research paves a new way for the design of optical communication devices.
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The datasets generated and analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
This work was supported by the Postgraduate Research & Practice Innovation Program of Jiangsu Province (Grant No. KYCX23_3628), the Industrial Center’s Innovation & Practice Program of Jiangsu University, China (Grant Nos. ZXJG2022036 and ZXJG2022037), the Practice and Innovation Training Project of College Students of Jiangsu University (Grant No. 202310299206Y).
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Yong-Feng Gao: Project administration, Conceptualization, Writing – review & editing. Xiao-Fei Qi: Methodology, Investigation, Writing – original draft. Zhi-Guo Yan: Investigation. Subinuer Rrouzi: Data curation. Meng-Cheng Jin: Software. Yue He: Formal analysis. Yi-Han He: Investigation, Validation. Ming-Yang Sun: Visualization. All authors reviewed the manuscript.
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Gao, YF., Qi, XF., Yan, ZG. et al. Coupled waveguide–cavity system based on higher-order topological states in square lattice photonic crystals. Appl. Phys. B 129, 156 (2023). https://doi.org/10.1007/s00340-023-08101-z
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DOI: https://doi.org/10.1007/s00340-023-08101-z