Dual-band terahertz absorber based on square ring metamaterial structure

Author:

Wang Dongxu,Xu Kai-Da1ORCID,Luo Siyuan2,Cui Yuqing,Zhang Liuyang,Liao Zhen3,Cui Jianlei

Affiliation:

1. Fudan University

2. Microsystem and Terahertz Research Center

3. Hangzhou Dianzi University

Abstract

In this paper, a dual-band terahertz absorber based on metamaterial structure is designed, fabricated, and measured. The metal periodic array is located on the upper surface of a silicon wafer with a metal ground plane, while the metamaterial structure is created utilizing a square metal ring with four T-shaped metal strips loaded inside of the ring. Two absorption peaks are realized at 0.715 and 1.013 THz with high Q-factors of 152.1 and 98.3, respectively, under normal TE and TM polarized incidence. A prototype of the proposed metamaterial absorber is fabricated by electron beam lithography (EBL) and electron beam evaporation (EBE) technology. Furthermore, a terahertz time-domain spectroscopy (TDS) measurement system is employed to test the absorber sample, with good measurement results obtained. This work provides a new option for the design of multi-band terahertz metamaterial absorbers.

Funder

NSAF Joint Fund

National Natural Science Foundation of China

State Key Laboratory of Advanced Optical Communication Systems and Networks

State Key Laboratory of Precision Spectroscopy Open Research Program

Natural Science Foundation of Zhejiang Province

“Siyuan Scholar” Fellowship of XJTU

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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