Wang, Qingwei, Zhang, Xueqian, Xu, Quan, Feng, Xi, Lu, Yongchang, Niu, Li, Chen, Xieyu, Plum, Eric, Gu, Jianqiang, Yang, Quanlong, Fang, Ming, Huang, Zhixiang, Zhang, Shuang, Han, Jiaguang and Zhang, Weili (2023) Nonlinear Terahertz Generation: Chiral and Achiral Meta-atom Coupling. Advanced Functional Materials, 33 (29), [2300639]. (doi:10.1002/adfm.202300639).
Abstract
Generation and manipulation of terahertz (THz) waves are of vital importance to advance THz technology. Nonlinear metasurfaces allow effective integration of both processes into a single compact device. However, such existing THz devices commonly rely on utilizing a single meta-atom, which has fixed THz generation properties and thus limits the range of achievable functionalities. Here, for the first time to our knowledge, we introduce a coupling effect between different meta-atoms into the unit-cell design, and experimentally validate this new degree of freedom in controlling the nonlinear THz generation, where achiral coupling provides full control over the amplitude of the generated THz field, while chiral coupling makes the THz generation sensitive to the handedness of the pump polarization. In particular, the chiral coupling case further allows a multiplexing-based handedness-selective nonlinear metasurface, which generates THz beams with different orbital angular momenta (OAMs). This approach is promising in developing various integrated nonlinear THz devices.
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