Fu Xiaojian, Shi Lei, Yang Jun, Fu Yuan, Liu Chenxi, Wu Jun Wei, Yang Fei, Bao Lei, Cui Tie Jun
State Key Laboratory of Millimeter Waves, Southeast University, Nanjing, Jiangsu 210096, People's Republic of China.
Institute of Electromagnetic Space, Southeast University, Nanjing, Jiangsu 210096, People's Republic of China.
ACS Appl Mater Interfaces. 2022 May 18;14(19):22287-22294. doi: 10.1021/acsami.2c02601. Epub 2022 Apr 27.
Terahertz wave manipulations, especially the phase manipulations, through metasurfaces has attracted considerable interests. Here, we develop a terahertz beam steering device using the liquid-crystal (LC)-integrated programmable metasurface. Specifically, a reflective-type 1 bit metasurface element is designed by employing a multilayer structure composed of metallic back plate-LC-complementary split ring resonator (CSRR). Numerical simulations show that, at the optimized operation frequency of 0.675 THz, the developed metasurface element has a nearly 180° phase difference between unbiased and biased states with close reflection amplitudes. Furthermore, a one-dimensional programmable metasurface array with 32 independently controlled subarrays is designed and fabricated using the lithography technology. Both simulated and measured far-field scattering patterns of the metasurface certify the anomalous beam reflection and wide-angle beam steering performances. Nevertheless, the optimal frequency red shifts to 0.645 THz in the experiment. This work may advance the application of metasurfaces in terahertz beam manipulation devices.
通过超表面对太赫兹波进行操控，尤其是相位操控，已引起了广泛关注。在此，我们开发了一种使用集成液晶（LC）的可编程超表面的太赫兹波束转向装置。具体而言，通过采用由金属背板-LC-互补分裂环谐振器（CSRR）组成的多层结构，设计了一种反射型1比特超表面单元。数值模拟表明，在0.675太赫兹的优化工作频率下，所开发的超表面单元在无偏置和有偏置状态之间具有近180°的相位差，且反射幅度相近。此外，利用光刻技术设计并制作了一个具有32个独立控制子阵列的一维可编程超表面阵列。超表面的模拟和实测远场散射图案均证实了其异常波束反射和广角波束转向性能。然而，在实验中最佳频率红移至0.645太赫兹。这项工作可能会推动超表面在太赫兹波束操控装置中的应用。
