矢量匹配法研究石墨烯太赫兹频段色散特性  

Research on graphene terahertz dispersion with the vector fitting method

作　　者：王全全 叶明坤 王艳[1] 

机构地区：[1]南京邮电大学通信与信息工程学院,南京210003 [2]东南大学毫米波国家重点实验室,南京210096

出　　处：《扬州大学学报（自然科学版）》2017年第4期54-57,共4页Journal of Yangzhou University：Natural Science Edition

基　　金：国家自然科学基金资助项目(61501252);东南大学毫米波国家重点实验室开放课题资助项目(K201608)

摘　　要：新型碳基纳米材料石墨烯的电磁参数在太赫兹频段表现出明显的色散特性,不利于时域积分方程方法等瞬态电磁的仿真.针对该问题,首先运用Kubo公式定义石墨烯太赫兹频段的表面电导率和阻抗,然后采用矢量匹配法准确拟合,获得表面电导率和阻抗展开式的极点和留数,最后对石墨烯频域表面阻抗的极点-留数展开式进行逆傅里叶变换得到时域积分方程方法所需要的时域表面阻抗.仿真结果验证了该方法的正确性和可行性.The notable dispersion of the novel carbon nanomaterial graphene at terahertz leads to dif-ficulties in transient electromagnetic simulation, e. g. the time domain integral equation （TDIE） method. This paper aims to achieve accurate fitting of graphene dispersive surface conductivity and impedance over ultra wideband terahertz frequencies. The fitting expansions can be readily applied in transient electromagnetic simulation. Graphene surface conductivity and impedance at terahertz are computed by the Kubo formula. Thereafter, the vector fitting method is used to approximate the surface conductivity and impedance by expansions with poles and residues. Numerical results are provided to validate the method. Graphene time domain surface impedance, which is needed in the TDIE method, can be obtained after the inverse Fourier transform of its frequency domain counter-part’s expansions.

关 键 词：石墨烯 色散 矢量匹配 太赫兹 

分 类 号：TN804[电子电信—信息与通信工程]