期刊
OPTICAL AND QUANTUM ELECTRONICS
卷 51, 期 5, 页码 -出版社
SPRINGER
DOI: 10.1007/s11082-019-1867-z
关键词
Graphene waveguides; SPPs; Topological edge modes
资金
- 973 Program [2014CB921301]
- National Natural Science Foundation of China [11674117]
- Natural Science Foundation of Hubei Province [2015CFA040, 2016CFB515]
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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