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Topological bound modes in optical waveguide arrays with alternating positive and negative couplings

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Abstract

We investigate the topological bound modes in a binary waveguide array with alternating positive and negative couplings. The negative coupling is realized by incorporating additional waveguides into the bare array and suitably tuning the refractive index. We show the band structures close and Dirac point emerges at the Brillouin zone center when the absolute values of real and negative couplings are equal, indicating topological phase transition. The topological bound modes emerge at the edge of topological non-trivial arrays or at the interface of two arrays with different topologies. Moreover, we show the topological bound mode can be isolated from the trivial defect mode by tuning the coupling strength, which is reflected from wave propagation. The study provides a promising approach to realizing robust light transport.

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Acknowledgements

This work is supported by National Natural Science Foundation of China (NSFC) (11804259), Program for Distinguished Middle-aged and Young Innovative Research Team in Higher Education of Hubei, China (T201806), the Campus Science Foundation Research Project of Wuhan Institute of Technology (K201821), and the 14th President’s Fund of Wuhan Institute of Technology, the Scientific Research Project of Hubei University of Science and Technology (BK202017).

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Authors and Affiliations

  1. Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan, 430205, China

    Nianzu Fu, Ziwei Fu, Huaiyuan Zhang, Qing Liao & Shaolin Ke

  2. School of Electronics and Information Engineering, Hubei University of Science and Technology, Xianning, 437100, China

    Dong Zhao

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  1. Nianzu Fu
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  2. Ziwei Fu
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  3. Huaiyuan Zhang
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  4. Qing Liao
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Correspondence to Dong Zhao or Shaolin Ke.

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Fu, N., Fu, Z., Zhang, H. et al. Topological bound modes in optical waveguide arrays with alternating positive and negative couplings. Opt Quant Electron 52, 61 (2020). https://doi.org/10.1007/s11082-019-2178-0

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