Directional Generation of Graphene Plasmons by Near Field Interference
arXiv:1601.00437 · doi:10.1364/OE.24.019776
Abstract
The highly unidirectional excitation of graphene plasmons (GPs) through near-field interference of orthogonally polarized dipoles is investigated. The preferred excitation direction of GPs by a single circularly polarized dipole can be simply understood with the angular momentum conservation law. Moreover, the propagation direction of GPs can be switched not only by changing the phase difference between dipoles, but also by placing the z-polarized dipole to its image position, whereas the handedness of the background field remains the same. The unidirectional excitation of GPs can be extended directly into arc graphene surface as well. Furthermore, our proposal on directional generation of GPs can be realized in a semiconductor nanowire/graphene system, where a semiconductor nanowire can mimic the circularly polarized dipole when illuminated by two orthogonally polarized plane waves.
8 pages, 5 figures
References in corpus (10)
- Graphene plasmonics
- Dyadic Green's Functions and Guided Surface Waves for a Surface Conductivity Model of Graphene
- Spin-orbit interactions of light
- Graphene Plasmonics for Terahertz to Mid-Infrared Applications
- Mid-Infrared Plasmonic Biosensing with Graphene
- Graphene Plasmonics: Challenges and Opportunities
- Chiral nanophotonic waveguide interface based on spin-orbit coupling of light
- Space-time dispersion of graphene conductivity
- Unusual Microwave Response of Dirac Quasiparticles in Graphene
- Directional excitation of graphene surface plasmons