We designed and theoretically verified a reflection-type terahertz beam splitter based on a metasurface, which consisted of a two-dimensional S-shaped meta-atom periodic array and a metal bottom plate, separated by a polyimide layer. Using a predesigned coding sequence, the proposed structure was able to realize a number of scattered terahertz beams and the directional manipulation of the reflected terahertz wave beams in a terahertz frequency range (from 0.9 THz to 1.9 THz). The far-field scattering of the proposed design was simulated using CST Microwave Studio. The results verified that the designed device was able to reduce a radar cross-section larger than −10 dB in a frequency range from 0.9 THz to 1.4 THz and from 1.65 THz to 1.9 THz. This work provides new ideas for the design of terahertz devices.

我们设计并从理论上验证了基于超表面的反射型太赫兹分束器，该分束器由二维S形超原子周期阵列和金属底板组成，并由聚酰亚胺层隔开。使用预先设计的编码序列，所提出的结构能够实现许多散射的太赫兹光束以及在太赫兹频率范围（0.9 THz至1.9 THz）中反射的太赫兹波光束的定向操作。所提出设计的远场散射是使用CST Microwave Studio模拟的。结果证实，所设计的设备能够在0.9 THz至1.4 THz和1.65 THz至1.9 THz的频率范围内减小大于-10 dB的雷达横截面。这项工作为太赫兹器件的设计提供了新思路。