借助于结构化的金属/介质界面所形成的人工表面等离激元，能够将太赫兹场束缚在亚波长量级，同时利用单元结构对几何参数的色散特性，可以在二维尺度上操纵太赫兹波，为集成化、小型化片上太赫兹功能器件的发展提供了解决途径。利用立体金属柱子结构的色散特性构建二维渐变折射率透镜，在此基础之上设计平面望远镜、波导耦合器、双功能透镜等二维太赫兹人工表面等离激元传输调控器件，并通过电磁仿真分析每种功能器件的工作性能。本工作不仅丰富了太赫兹表面波调控器件家族，并有望进一步发展表面等离激元链路的太赫兹片上系统。

The terahertz (THz) field can be confined and manipulated at the sub-wavelength level using spoof surface plasmon polaritons (SSPPs) formed on structured metal/dielectric interfaces. Furthermore, it is feasible to manipulate THz waves on a two-dimensional (2D) scale by utilizing the dispersion properties of the unit structure on the geometrical parameters, which provides a solution for the development of integrated and miniaturized on-chip THz multi-functional devices. This study proposes a 2D gradient refractive index lens based on the dispersion characteristics of the metallic pillar structure. THz SSPP devices were designed according to the proposed design scheme for manipulating the propagation, such as flat telescopes, waveguide couplers, and dual-function lenses, and the working performance of each functional device was analyzed through electromagnetic simulations. This study not only enhances the different THz surface wave control devices but can also help develop THz on-chip systems further based on surface plasmon polariton chains.