Dyadic Green’s Functions and Guided Surface Waves for a Surface Conductivity Model of Graphene
نویسنده
چکیده
An exact solution is obtained for the electromagnetic field due to an electric current in the presence of a surface conductivity model of graphene. The graphene is represented by an infinitesimallythin, local and isotropic two-sided conductivity surface. The field is obtained in terms of dyadic Green’s functions represented as Sommerfeld integrals. The solution of plane-wave reflection and transmission is presented, and surface wave propagation along graphene is studied via the poles of the Sommerfeld integrals. For isolated graphene characterized by complex surface conductivity σ = σ+ jσ, a proper transverse-electric (TE) surface wave exists if and only if σ > 0 (associated with interband conductivity), and a proper transverse-magnetic (TM) surface wave exists for σ < 0 (associated with intraband conductivity). By tuning the chemical potential at infrared frequencies, the sign of σ can be varied, allowing for some control over surface wave properties.
منابع مشابه
Dyadic Green’s Functions and Guided Surface Waves on Graphene
An exact solution is obtained for the electromagnetic field due to an electric current source near graphene located at the interface between two dielectrics. The field is obtained in terms of dyadic Green’s functions represented as Sommerfeld integrals. The graphene is modeled as an infinitely-thin surface characterized by a surface conductance σ, which could be obtained via microscopic theory ...
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