Topological valley plasmon transport in bilayer graphene metasurfaces for sensing applications
arXiv:2005.14269 · doi:10.1364/OL.393302
Abstract
Topologically protected plasmonic modes located inside topological bandgaps are attracting increasing attention, chiefly due to their robustness against disorder-induced backscattering. Here, we introduce a bilayer graphene metasurface that possesses plasmonic topological valley interface modes when the mirror symmetry of the metasurface is broken by horizontally shifting the lattice of holes of the top layer of the two freestanding graphene layers in opposite directions. In this configuration, light propagation along the domain-wall interface of the bilayer graphene metasurface shows unidirectional features. Moreover, we have designed a molecular sensor based on the topological properties of this metasurface using the fact that the Fermi energy of graphene varies upon chemical doping. This effect induces strong variation of the transmission of the topological guided modes, which can be employed as the underlying working principle of gas sensing devices. Our work opens up new ways of developing robust integrated plasmonic devices for molecular sensing.
arXiv comment4 pages, 5 figures
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Cited by in corpus (5)
- A brief review of topological photonics in one, two, and three dimensions
- Topological metasurface: From passive toward active and beyond
- Second-harmonic generation via double topological valley-Hall kink modes in all-dielectric photonic crystals
- All-optical control of topological valley transport in graphene metasurfaces
- Optically controllable coupling between edge and topological interface modes of graphene metasurfaces