极化复用的多功能反射型太赫兹超表面

Multifunctional reflective terahertz metasurface featuring polarization multiplexing

摘要:

现有的无源超表面功能较为单一，为增加调控太赫兹波的灵活性，提出一种极化复用的反射型超表面。该超表面能够实现波束偏转、双焦点聚焦、聚焦涡旋和远场成像等多种功能。在1 THz频率下，通过x极化和y极化波的分别入射，该超表面成功产生2个偏转波束，并在焦平面上实现了双焦点聚焦。此外，该超表面在x极化和y极化波入射条件下，还分别实现了拓扑荷为l=+2的聚焦涡旋光束和远场成像。所设计的超表面显示出在不同极化波入射下灵活操纵太赫兹波的能力，展示了在太赫兹通信领域的潜在应用前景。

Abstract:

The existing passive metasurfaces have relatively limited functions. To increase the flexibility of controlling terahertz waves, a polarization-multiplexed reflective metasurface is proposed. This metasurface is capable of various functions such as beam deflection, dual-focus focusing, focused vortex, and far-field imaging. At a frequency of 1 THz, by separately incident x-polarized and y-polarized waves, the metasurface successfully generated two deflected beams and achieved dual-focus focusing on the focal plane. In addition, the metasurface also realized focused vortex beams with a topological charge of l=+2 and far-field imaging under the conditions of x-polarized and y-polarized wave incidence, respectively. The designed metasurface demonstrates the ability to flexibly manipulate terahertz waves under different polarization wave incidences, showing potential application prospects in the field of terahertz communication.