Jiang Ming-Yang, Li Jiu-Sheng, Xiong Ri-Hui
Appl Opt. 2024 May 1;63(13):3636-3640. doi: 10.1364/AO.519334.
Active adjustable terahertz multifunctional devices are crucial for the application of terahertz technology. In this paper, we propose a composite metasurface structure based on an indium antimonide metal octagonal pattern, which achieves different functional switching by controlling the phase state of indium antimonide material under different ambient temperatures. When indium antimonide exhibits in the dielectric state, by stacking and encoding the unit cell, the designed metasurface has the functions of two-beam splitting beam superposition, vortex beam and quarter beam superposition, and dual vortex beam superposition for circularly polarized and linearly polarized wave incidence. When indium antimonide appears in the metallic state, the encoding metasurface alters the modulation function of incident circularly polarized and linearly polarized terahertz waves. This terahertz metasurface provides a new approach for the design of multifunctional devices that can flexibly regulate terahertz wave metasurfaces.
有源可调太赫兹多功能器件对于太赫兹技术的应用至关重要。在本文中，我们提出了一种基于锑化铟金属八角形图案的复合超表面结构，该结构通过控制锑化铟材料在不同环境温度下的相位状态来实现不同的功能切换。当锑化铟呈现介电状态时，通过对单元胞进行堆叠和编码，所设计的超表面对于圆偏振波和线偏振波入射具有双光束分束叠加、涡旋光束和四分之一光束叠加以及双涡旋光束叠加的功能。当锑化铟呈现金属状态时，编码超表面改变入射圆偏振和线偏振太赫兹波的调制功能。这种太赫兹超表面为可灵活调节太赫兹波超表面的多功能器件设计提供了一种新方法。
