Wang Yunji, Gu Yao, Liu Fei, Chen Lin, Wang XingChao, Ji Ke
J Opt Soc Am A Opt Image Sci Vis. 2025 Mar 1;42(3):309-314. doi: 10.1364/JOSAA.546252.
A tunable broadband terahertz absorber based on five square rings of vanadium dioxide () is proposed in this paper. We use a CST software to simulate the absorption characteristics of the absorber. The results show that the bandwidth of the absorber, with absorption exceeding 90%, reached 2.51 THz from 2.71 to 5.22 THz. The electric and surface current distributions reveal that the high absorption is due to the dipole resonance and coupling of the square rings. The absorption peak can be approximately tuned from 2% to 99.5% by varying the conductivity of from 200 S/m to 200,000 S/m. In addition, the absorber has polarization insensitivity and can maintain good absorption performance over a wide range of incident angles. The designed absorber is expected to be widely used in areas of terahertz communication, imaging, and detection.
本文提出了一种基于五个二氧化钒（）方环的可调谐宽带太赫兹吸收器。我们使用CST软件来模拟该吸收器的吸收特性。结果表明，吸收率超过90%时，吸收器的带宽从2.71太赫兹到5.22太赫兹达到2.51太赫兹。电场和表面电流分布表明，高吸收是由于方环的偶极子共振和耦合。通过将的电导率从200 S/m改变到200,000 S/m，吸收峰可从约2%调谐到99.5%。此外，该吸收器具有偏振不敏感性，并且在很宽的入射角范围内都能保持良好的吸收性能。所设计的吸收器有望在太赫兹通信、成像和探测等领域得到广泛应用。
