Zhang Pengyu, Chen Guoquan, Hou Zheyu, Zhang Yizhuo, Shen Jian, Li Chaoyang, Zhao Maolin, Gao Zhuozhen, Li Zhiqi, Tang Tingting
School of Information and Communication Engineering, Hainan University, Haikou 570228, China.
State Key Laboratory of Marine Resources Utilization in South China Sea, Hainan University, Haikou 570228, China.
Micromachines (Basel). 2022 Apr 25;13(5):669. doi: 10.3390/mi13050669.
Based on the phase transition of vanadium dioxide(VO), an ultra-broadband tunable terahertz metamaterial absorber is proposed. The absorber consists of bilayer VO square ring arrays with different sizes, which are completely wrapped in Topas and placed on gold substrate. The simulation results show that the absorption greater than 90% has frequencies ranging from 1.63 THz to 12.39 THz, which provides an absorption frequency bandwidth of 10.76 THz, and a relative bandwidth of 153.5%. By changing the electrical conductivity of VO, the absorption intensity can be dynamically adjusted between 4.4% and 99.9%. The physical mechanism of complete absorption is elucidated by the impedance matching theory and field distribution. The proposed absorber has demonstrated its properties of polarization insensitivity and wide-angle absorption, and therefore has a variety of application prospects in the terahertz range, such as stealth, modulation, and sensing.
基于二氧化钒（VO₂）的相变特性，提出了一种超宽带可调谐太赫兹超材料吸收器。该吸收器由不同尺寸的双层VO₂方环阵列组成，这些阵列完全包裹在Topas中并放置在金衬底上。仿真结果表明，吸收率大于90%的频率范围为1.63太赫兹至12.39太赫兹，提供了10.76太赫兹的吸收频率带宽和153.5%的相对带宽。通过改变VO₂的电导率，吸收强度可在4.4%至99.9%之间动态调节。通过阻抗匹配理论和场分布阐明了完全吸收的物理机制。所提出的吸收器展现出了偏振不敏感和广角吸收的特性，因此在太赫兹频段具有诸如隐身、调制和传感等多种应用前景。
