Abstract
We investigate the topological edge modes of surface plasmonic polaritons (SPPs) in a two-dimensional waveguide array composed of graphene-coated nanowires. The system experiences topological phase transition by tuning the inter-layer spacing between adjacent unit cells. The topological modes emerge at the edge of topological non-trivial nanowire arrays when the intra-layer spacing is larger than the inter-layer spacing. Thanks to the strong confinement of graphene SPPs, the modal wavelength of topological edge modes can be squeezed as small as 1/20 of incident wavelength. The study provides a promising approach to realizing robust light transport beyond diffraction limit.
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Acknowledgements
This work is supported by the 973 Program (No. 2014CB921301), the National Natural Science Foundation of China (No. 11674117), Natural Science Foundation of Hubei Province (2015CFA040, 2016CFB515).
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Meng, P., Zhao, D., Zhong, D. et al. Topological plasmonic modes in graphene-coated nanowire arrays. Opt Quant Electron 51, 156 (2019). https://doi.org/10.1007/s11082-019-1867-z
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DOI: https://doi.org/10.1007/s11082-019-1867-z