广东工业大学学报 ›› 2019, Vol. 36 ›› Issue (05): 20-24.doi: 10.12052/gdutxb.180189

• 综合研究 • 上一篇    下一篇

一种基于超表面的超宽带THz吸波体

熊旋1, 荣丰梅2, 文元美1   

  1. 1. 广东工业大学 信息工程学院, 广东 广州 510006;
    2. 广州京信通信有限公司, 广东 广州 510000
  • 收稿日期:2018-12-31 出版日期:2019-08-21 发布日期:2019-08-06
  • 作者简介:熊旋(1976-),女,讲师,博士,主要研究方向为超材料、新材料传感等.E-mail:xxiong@gdut.edu.cn
  • 基金资助:
    2017年中央财政支持地方高校建设项目“通信工程专业主干课程教学团队”

A Metasurface Broadband THz Absorber

Xiong Xuan1, Rong Feng-mei2, Wen Yuan-mei1   

  1. 1. School of Information Engineering in Guangdong University of Technology, Guangzhou 510006, China;
    2. Guangzhou Jingxin Communications Co., Ltd., Guangzhou 510000, China
  • Received:2018-12-31 Online:2019-08-21 Published:2019-08-06

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摘要： 设计了一种超表面宽带太赫兹（THz）吸波体，吸波单元由开裂的椭圆金属环组成，其地板和椭圆环都是金，两层金之间是介质层.椭圆环由两个轴比不同的椭圆相减而成.结果表明，当设定吸波体的最低吸收率为90%，垂直入射时，该吸波体的吸收相对带宽达到了91.7%（0.98~2.64 THz），在f=1.74 THz，其最大吸收率达99.99%.讨论了用干涉模型计算的结果，两种方法所得结果吻合较好.此外，该吸波体对TE和TM两种极化都具有广角吸收特性.与已发表的各吸波体相比较，所提出的THz吸波体几何形状简单，具有超宽带特性以及极化不敏感性.因此可用于许多应用，如太赫兹成像系统、辐射计和隐身技术等.

关键词: 太赫兹(THz), 超表面, 超宽带, 吸收, 两端开裂的不规则椭圆环

Abstract: A metasurface broadband Terahertz (THz) absorber is presented, of which the unit cell is made up of a split elliptical irregular ring, a dielectric substrate and a metallic ground. The elliptical irregular ring is composed of a smaller ellipse eroded from a bigger ellipse, and the two ellipses have different ratio of the long axis and the short axis. The simulation results show that the absorber achieves a broadband absorption from 0.98 THz to 2.64 THz, with the absorptivity over 90% at normal incidence, the maximum absorptivity being 99.99%, which are in agreement with the calculated result by using an interference model. The bandwidth is 91.7% with respect to the central frequency. Besides, the proposed absorber has property of wide angle absorptivity for both TE and TM polarizations. Compared with published designs, the proposed THz absorber has a simple geometry but a broadband and polarization insensitivity, and hence it can be used in many applications, such as THz imaging system, radiometer and stealthy technology.

Key words: Terahertz (THz), metasurface, broadband, absorption, split elliptical irregular ring

中图分类号: 

  • O441
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