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Topological valley plasmon transport in graphene bi-layer metasurfaces: Applications to sensing nanodevices

Wang, Y; You, JW; Lan, Z; Panoiu, NC; (2020) Topological valley plasmon transport in graphene bi-layer metasurfaces: Applications to sensing nanodevices. In: Proceedings of SPIE Photonics Europe. Metamaterials XII. Society of Photo-Optical Instrumentation Engineers (SPIE) Green open access

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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.

Type: Proceedings paper
Title: Topological valley plasmon transport in graphene bi-layer metasurfaces: Applications to sensing nanodevices
ISBN-13: 9781510634602
Open access status: An open access version is available from UCL Discovery
DOI: 10.1117/12.2555724
Publisher version: https://doi.org/10.1117/12.2555724
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions.
Keywords: Topological photonics, valley-Hall, graphene, sensing
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10100607
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