Terahertz waves have attracted considerable attention in recent years because of their potential applications in different fields. The appearance of a digital metasurface simplifies the design of functional devices and manipulates the terahertz wave in a convenient way with a specific array of digital particles. Metal resonators are mostly used in traditional structures, and the ohmic loss of metal will affect the energy transmission efficiency. In our work, we propose a silicon medium metasurface by pre-designing different digital sequences for terahertz wave different control functions such as anomalous reflection, beam splitting, diffuse scattering and generation of vortex beam. The far-field scattering patterns and near-field distribution are obtained by numerical simulation, which are in accordance with the values predicted analytically. Our work provides an effective method to promote the diversification of the metasurface-based functional devices in the terahertz region.

中文翻译：

---

基于硅介质超表面的多功能太赫兹波调节

太赫兹波由于其在不同领域的潜在应用，近年来引起了相当大的关注。数字超表面的出现简化了功能设备的设计，并通过特定的数字粒子阵列以方便的方式操纵了太赫兹波。金属谐振器主要用于传统结构中，金属的欧姆损耗会影响能量传输效率。在我们的工作中，我们通过为太赫兹波的不同控制功能（例如反常反射，分束，扩散散射和涡流束的产生）预先设计不同的数字序列，来提出硅介质超表面。通过数值模拟获得远场散射图案和近场分布，这与解析预测的值一致。