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Proceedings Paper

Topological valley plasmon transport in graphene bi-layer metasurfaces: applications to sensing nanodevices
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Paper Abstract

Topologically protected plasmonic states with wide topological band gaps provide unprecedented robustness against disorder-induced backscattering. In this study, we design a graphene bi-layer metasurface that possesses valley-Hall topological plasmonic modes in a nontrivial bandgap. In particular, the breaking of mirror symmetry of two graphene layers is achieved via a horizontal shift of the hole lattice of the top layer, which leads to topologically protected edge modes in the nontrivial bandgap. The corresponding band dispersion of the topological edge modes shows unidirectional propagation features. Moreover, we have designed a sensitive molecular sensor based on such graphene bi-layer metasurfaces, using the fact that the chemical potential of graphene varies upon adsorption of gas molecules. This effect leads to a marked variation of the transmission of the topological mode, and thus a sensing device with large sensitivity can be realized.

Paper Details

Date Published: 1 April 2020
PDF: 7 pages
Proc. SPIE 11344, Metamaterials XII, 113441E (1 April 2020); doi: 10.1117/12.2555724
Show Author Affiliations
Yupei Wang, Univ. College London (United Kingdom)
Jian Wei You, Univ. College London (United Kingdom)
Zhihao Lan, Univ. College London (United Kingdom)
Nicolae C. Panoiu, Univ. College London (United Kingdom)

Published in SPIE Proceedings Vol. 11344:
Metamaterials XII
Kevin F. MacDonald; Isabelle Staude; Anatoly V. Zayats, Editor(s)

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