摘 要目前，石墨烯优异的电学、光学和热性能已引起世界各国研究者的关注。石墨烯是一种二维纳米材料，在光电、电磁、通信等领域有着重要的应用前景。由于大面积单层石墨烯的制备困难，以及多层石墨烯优异的太赫兹器件应用潜力、简单的制备工艺等特点，多层石墨烯的应用也越来越频繁。本文基于对单层石墨烯电导率的分析，研究了多层石墨烯在太赫兹波段的电导率及其零极点提取等内容。理论分析和数值模拟能够降低成本，进而加快石墨烯器件的设计、生产及应用。矢量匹配法能够以较少的迭代次数获得精确的近似结果，并可提取整个分析频段近似展开式的极点和留数，在进行逆傅里叶变换后仍可用于后续的时域计算，本文采用矢量拟合法精确描述多层石墨烯材料太赫兹频段的电导率、阻抗以及温度、化学势对电导率的影响，另外为了适应高速、宽带信号和非线性系统日益增多的工程应用，石墨烯瞬态电磁问题的时域分析方法也逐渐发展起来，本文通过时域积分方程方法离散石墨烯表面，仿真石墨烯太赫兹频段的瞬态电磁特性，将矢量拟合法与时域积分方程相结合，通过逆傅里叶变换得到时域积分方程方法所需的时域表面阻抗，本文在理论分析以及数值仿真的基础上，研究了太赫兹频段多层石墨烯的电导率，为石墨烯太赫兹器件在太赫兹通信器件领域的发展提供了有利帮助。关键词：多层石墨烯；太赫兹；电导率；矢量匹配法；时域积分方程ABSTRACTAt present, the excellent electrical, optical and thermal properties of graphene have attracted the attention of researchers all over the world. Graphene is a kind of two-dimensional nanometer material, which has important application prospects in the fields of photoelectricity, electromagnetism and communication. Because of the large area of single-layer graphene preparation is difficult, and multilayer graphene excellent terahertz device application potential and simple preparation technology, the application of multilayer graphene is more and more frequent.Based on the analysis of the conductivity of single-layer graphene, the conductivity and zero-pole extraction of multilayer graphene in terahertz band are studied. Theoretical analysis and numerical...
