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Electrically controlled topological surface plasmon polaritons: integrating plasmonic metagates with graphene (Conference Presentation)

Paper Abstract

Topological photonics offers remarkable solutions to robust light propagation and coupling. Two challenges can be identified: (1) making topological structures reconfigurable, and (2) shrinking them to nanoscale. I will discuss a platform that addresses both challenges: a valley plasmonic crystal for graphene surface plasmons. We demonstrate that a designer metagate, placed within a few nanometers of graphene, can be used to impose a periodic Fermi energy landscape on graphene. For specific metagate geometries and bias voltages, the combined metagategraphene structure is shown to produce complete propagation band gaps for the plasmons, and to impart them with nontrivial valley-linked topological properties. Sharply curved domain walls between differently patterned metagates are shown to guide highly localized plasmons without any reflections owing to suppressed intervalley scattering.

Paper Details

Date Published: 9 September 2019
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Proc. SPIE 11082, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XVII, 110820K (9 September 2019); doi: 10.1117/12.2529835
Show Author Affiliations
Gennady B. Shvets, Cornell Univ. (United States)
Minwoo Jung, Cornell Univ. (United States)
Zhiyuan Fan, Cornell Univ. (United States)


Published in SPIE Proceedings Vol. 11082:
Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XVII
Din Ping Tsai; Takuo Tanaka, Editor(s)

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