基于HIE-FDTD方法的太赫兹频段石墨烯吸收器的设计  

Designing graphene absorber in Terahertz band using HIE-FDTD method

作　　者：韩晓冰[1] 张辉 梁冰洋 周远国 HAN Xiaobing;ZHANG Hui;LIANG Bingyang;ZHOU Yuanguo(College of Communication and Information Engineering,Xi’an University of Science and Technology,Xi’an 710054,Chian)

机构地区：[1]西安科技大学通信与信息工程学院,西安710054

出　　处：《电波科学学报》2022年第1期106-112,136,共8页Chinese Journal of Radio Science

基　　金：陕西省教育厅一般专项科学研究计划(20JK0759);陕西省自然科学基础研究计划(2020JM-515)。

摘　　要：应用混合显隐式时域有限差分(hybrid implicit-explicit finite-difference time-domain, HIE-FDTD)方法对石墨烯吸收器进行数值模拟.通过辅助差分方程(auxiliary difference equation, ADE)将石墨烯带内电导率引入到HIE-FDTD方法中并结合共形技术对设计的新型石墨烯吸收器完成了特性分析.数值结果表明:该吸收器在2.68 THz附近吸收率可达到99.8%,而且在太赫兹频段下可以通过控制石墨烯的化学势和圆环宽度调整该吸收器的工作频率.本文设计的环状结构吸收器结构简单,在检测器、传感器、滤波器等太赫兹器件方面具有潜在的应用.The hybrid implicit-explicit FDTD(HIE-FDTD) method is used to numerically simulate the graphene absorber. The intraband conductivity of graphene is introduced into the HIE-FDTD method through the auxiliary difference equation(ADE) and the conformal technology is used to complete the characteristic analysis of the designed new graphene absorber. Numerical results show that the absorption rate of the absorber can reach 99.8% near 2.68 THz,and the working frequency of the absorber can be adjusted by controlling the chemical potential of graphene and the width of the ring in the terahertz frequency band. The ring-shaped absorber designed in this paper has a simple structure and has potential applications in terahertz devices such as detectors, sensors, and filters.

关 键 词：太赫兹波段 混合显隐式时域有限差分(HIE-FDFD)方法 石墨烯 辅助差分方程(ADE) 吸收器 

分 类 号：O441.4[理学—电磁学]