太赫兹超材料极化转换器设计及其特性分析

Design and Characteristics Analysis of A Terahertz Metamaterial Polarization Converter

摘要:

提出了一种反射型太赫兹超材料极化转换器。该极化转换器结构单元由典型的三层结构组成,上、下两层为金属层,中间为介质层,顶层金属层由一个开口谐振环和一个镂空圆盘组成。研究结果表明:该极化转换器能够将x极化波转换为y极化波,在0.584 0~1.352 0THz频带上极化转换率大于80%,在0.642 4、0.936 4和1.301 8THz处极化转换率接近100%。该极化转换器结构简单、便于加工,且能实现宽频带极化转换,在太赫兹波通信、成像等方面有广阔的应用前景。

Abstract:

A reflective terahertz metamaterial polarization converter is proposed. The polarization converter structural unit is composed of a typical threelayer structure, which consists of two metal layers and a single dielectric layer, and the top metal layer is composed of an open resonant ring and a hollow disk. The results show that the polarization converter can convert the xpolarized wave into a ypolarized wave with a polarization conversion of more than 80% and a working bandwidth of 0.5840~1.3520THz. In addition, the polarization conversion of the polarization converters approaches 100% at 0.6424, 0.9364 and 1.3018THz, respectively. The polarization converter has the advantages of simple structure, easy processing and wideband polarization conversion, and has wide application prospect in terahertz communication and imaging.