• 文献标题:   Graphene Plasmons in Triangular Wedges and Grooves
  • 文献类型:   Article
  • 作  者:   GONCALVES PAD, DIAS EJC, XIAO SS, VASILEVSKIY MI, MORTENSEN NA, PERES NMR
  • 作者关键词:   graphene plasmon, plasmonic, nanophotonic, channel plasmon, wedge, groove
  • 出版物名称:   ACS PHOTONICS
  • ISSN:   2330-4022
  • 通讯作者地址:   Tech Univ Denmark
  • 被引频次:   13
  • DOI:   10.1021/acsphotonics.6b00674
  • 出版年:   2016

▎ 摘  要

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.