Abstract
Surface plasmon modes at terahertz-infrared waveband in subwavelength graphene wedge and groove waveguides are investigated, which can be categorized into perfect electric conductor and perfect magnetic conductor symmetric modes with different propagation characteristics. The electromagnetic near-fields are localized strongly in different regions for these two kinds of modes. Moreover, these modes can be interpreted by the folded graphene ribbon modes. The brim width of the waveguides and the Fermi energy of the graphene strongly influence the dispersion and propagation distances of the plasmon modes, which can be used for tuning the plasmon modes in graphene wedge and groove waveguides efficiently.
Highlights
Graphene, a single layer combined carbon atom sheet, is believed as novel optoelectronic material for applications ranging from the terahertz to the visible spectral region [1]
We have investigated the properties of surface plasmon modes in graphene wedge and groove waveguides using the finite element method
Our results show that graphene wedge waveguides can support propagating plasmons efficiently at terahertz-infrared waveband
Summary
A single layer combined carbon atom sheet, is believed as novel optoelectronic material for applications ranging from the terahertz to the visible spectral region [1]. Metallic channel [21,22,23,24] and wedge [25,26,27] plasmon waveguides have been investigated and were believed as efficient propagating plasmon devices These structures were mostly designed for near-infrared to visible applications, whose performance could be only controlled passively by changing geometry parameters, such as the depth [22] or thickness [24] of the wedges and grooves. Two kinds of plasmon modes exist in both wedge and groove waveguides, which possess perfect electric conductor (PEC) and perfect magnetic conductor (PMC) symmetries, respectively In these two kinds of plasmon modes, electromagnetic fields are confined in different regions, and show different propagation characteristics. We discuss how the doping level of graphene affects the propagating plasmons in these waveguides
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