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All-optical analog to electromagnetically induced transparency based on higher-order topological states

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Abstract

In this paper, we investigate a topologically nontrivial kagome lattice and some special higher-order corner states, which originate from next-nearest-neighbor interactions and evolve from the edge states, so that the coupling between these new corner states is more easily to be tuned in contrast to the conventional “zero-energy” corner state. By introducing this topologically nontrivial kagome lattice with a zigzag perfect-electric-conductor boundary into a conventional photonic crystal waveguide system, and using a simple method to precisely control the coupling between the corner states and the waveguide, an all-optical analog of electromagnetically induced transparency with topological protection is achieved for the first time, to the best of our knowledge. These results may expand our understanding of the higher-order corner modes in a more general framework, and find applications in the fields of light delay, narrowband filter, and on-chip optical signal processing.

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Data Availability Statement

This manuscript has associated data in a data repository. [Authors’ comment: Data underlying the results presented in this paper may be obtained from the authors upon reasonable request.]

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Acknowledgements

This work was supported in part by the National Natural Science Foundation of China (11774098); Guangdong Natural Science Foundation (2017A030313016); Science and Technology Program of Guangzhou (202002030500).

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Authors and Affiliations

  1. School of Physics and Optoelectronic Technology, South China University of Technology, Guangzhou, 510640, China

    Shi-Lei Shen, Jia-Lin Li, Jun-Fang Wu & Chao Li

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  1. Shi-Lei Shen
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  2. Jia-Lin Li
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  3. Jun-Fang Wu
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Correspondence to Jun-Fang Wu or Chao Li.

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Shen, SL., Li, JL., Wu, JF. et al. All-optical analog to electromagnetically induced transparency based on higher-order topological states. Eur. Phys. J. Plus 137, 97 (2022). https://doi.org/10.1140/epjp/s13360-021-02313-y

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