Journal of Guangdong University of Technology ›› 2019, Vol. 36 ›› Issue (05): 20-24.doi: 10.12052/gdutxb.180189

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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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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

CLC Number: 

  • O441
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