Terahertz Perfect Absorber Based on Asymmetric Open-Loop Cross-Dipole Structure
Meng-Yao Yan , Bi-Jun Xu** , Zhi-Chao Sun , Zhen-Dong Wu , Bai-Rui Wu
School of Sciences, Zhejiang University of Science and Technology, Hangzhou 310023, China
Abstract ：Equipped with multiple and unique features, a terahertz absorber exhibits great potential for use in the development of communication, military, and other fields where achieving perfect broadband absorption has always been a challenge. We present a metamaterial terahertz (THz) absorber comprising a cross-dipole patch, four symmetric square patches and an asymmetric open-loop patch with a good perfect absorption rate for TE and TM polarizations. The average absorption of more than 96% occurs in the frequency range from 2.4 THz to 3.8 THz, in which the absorptance peak can reach 99.9%, as indicated by simulated results. Our design has broad potential applications in THz couplers, as well as in fields like biology and security.
收稿日期: 2020-02-24
出版日期: 2020-05-26
:
78.67.Pt
(Multilayers; superlattices; photonic structures; metamaterials)
42.25.Bs
(Wave propagation, transmission and absorption)
42.70.-a
(Optical materials)
78.20.Ci
(Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))
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2020, Vol. 37 
