Graphene plasmons in triangular wedges and grooves

• Main Author: Gonçalves, Paulo André Dias
• Publication Date: 2016
• Other Authors: Dias, E. J. C., Xiao, Sanshui, Vasilevskiy, Mikhail, Mortensen, N. Asger, Peres, N. M. R.
• Format: Article
• Language: eng
• Source: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
• Download full: 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.