Wang Dongxu, Xu Kai-Da, Luo Siyuan, Cui Yuqing, Zhang Liuyang, Liao Zhen, Cui Jianlei
Opt Express. 2023 Feb 13;31(4):5940-5950. doi: 10.1364/OE.482367.
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.
本文设计、制作并测量了一种基于超材料结构的双频太赫兹吸收体。金属周期阵列位于带有金属接地平面的硅片上表面，而超材料结构是利用一个方形金属环并在环内加载四条T形金属条来构建的。在正常TE和TM偏振入射下，分别在0.715和1.013太赫兹处实现了两个吸收峰，其品质因数分别高达152.1和98.3。所提出的超材料吸收体的原型是通过电子束光刻（EBL）和电子束蒸发（EBE）技术制作的。此外，采用太赫兹时域光谱（TDS）测量系统对吸收体样品进行测试，获得了良好的测量结果。这项工作为多频太赫兹超材料吸收体的设计提供了一种新的选择。
