Graphene plasmons in triangular wedges and grooves

• Autor(a) principal: Gonçalves, Paulo André Dias
• Data de Publicação: 2016
• Outros Autores: Dias, E. J. C., Xiao, Sanshui, Vasilevskiy, Mikhail, Mortensen, N. Asger, Peres, N. M. R.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/1822/43419
• topic: Channel plasmons; Graphene plasmons; Groove; Nanophotonics; Plasmonics; Wedge; Ciências Naturais::Ciências Físicas; Science & Technology

The ability to effectively guide electromagnetic radiation below the diffraction limit is of the utmost importance in the prospect of all-optical plasmonic circuitry. Here, we propose an alternative solution to conventional metal-based plasmonics by exploiting the deep subwavelength confinement and tunability of graphene plasmons guided along the apex of a graphene-covered dielectric wedge or groove. In particular, we present a quasi-analytic model to describe the plasmonic eigenmodes in such a system, including the complete determination of their spectrum and corresponding induced potential and electric-field distributions. We have found that the dispersion of wedge/groove graphene plasmons follows the same functional dependence as their flat-graphene plasmon counterparts, but now scaled by a (purely) geometric factor in which all the information about the system’s geometry is contained. We believe our results pave the way for the development of novel custom-tailored photonic devices for subwavelength waveguiding and localization of light based on recently discovered 2D materials.