Xu Shi-Tong, Fan Junxing, Xue Zhanqiang, Li Jiandi, Wang Ying-Hua, Pan Yue, Cao Hong-Zhong, Ma Ren-De, Lu Dan, Zhang Hui-Fang, Cong Longqing
Opt Lett. 2024 Sep 1;49(17):4891-4894. doi: 10.1364/OL.537007.
We experimentally demonstrate a liquid crystal (LC)-integrated EIT metasurface for active THz polarization conversion and asymmetric transmission. By controlling the LC orientation under static magnetic field anchoring and an adjustable electric field, the device realizes the active control from the OFF state to the ON state, corresponding to the orthogonal polarization excitation modes of the EIT metasurface. Furthermore, based on the different polarization responses at forward and backward incidences, we achieve asymmetric transmission at the EIT peak and two nearby resonances, with its isolation actively manipulated by the external electric field. This study on dynamic polarization conversion and asymmetric transmission by a LC-integrated metasurface offers a promising route for active THz devices, applicable to THz communication, switching, and sensing systems.
我们通过实验展示了一种用于有源太赫兹偏振转换和非对称传输的集成液晶（LC）的电磁诱导透明（EIT）超表面。通过在静磁场锚定和可调电场下控制液晶取向，该器件实现了从关态到开态的有源控制，这对应于EIT超表面的正交偏振激发模式。此外，基于正向和反向入射时不同的偏振响应，我们在EIT峰和两个附近的共振处实现了非对称传输，其隔离度可由外部电场主动控制。这项关于集成液晶超表面的动态偏振转换和非对称传输的研究为有源太赫兹器件提供了一条有前景的途径，适用于太赫兹通信、开关和传感系统。
