Dyadic Green's functions and guided surface waves for a surface conductivity model of graphene
Dyadic Green's functions and guided surface waves for a surface conductivity model of graphene
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DOI：
10.1063/1.2891452
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发表时间：
2008-03-15
影响因子：
3.2
通讯作者：
Hanson, George W.
中科院分区：
文献类型：
--
作者：
Hanson, George W.
在石墨烯表面电导率模型存在的情况下，得到了由电流引起的电磁场的精确解。石墨烯表现为极薄的、局部的、各向同性的双面导电表面。该域是用表示为Sommerfeld积分的并矢格林函数得到的。给出了平面波反射和透射的解，并研究了表面波沿石墨烯的传播，通过Sommerfeld积分的极点。对于具有复杂表面导电性sigma = sigma' + j sigma“的孤立石墨烯，当且仅当sigma' > 0（与带间导电性相关）存在合适的横磁表面波，且当sigma” < 0（与带内导电性相关）存在合适的横磁表面波。通过调整红外频率下的化学势，“σ”的符号可以改变，从而允许对表面波特性进行一些控制。(C) 2008年美国物理研究所。
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 infinitesimally thin, 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 sigma = sigma' + j sigma" , a proper transverse- electric surface wave exists if and only if sigma' > 0 (associated with interband conductivity ), and a proper transverse- magnetic surface wave exists for sigma'' < 0 (associated with intraband conductivity). By tuning the chemical potential at infrared frequencies, the sign of sigma'' can be varied, allowing for some control over surface wave properties. (C) 2008 American Institute of Physics.