中文摘要：

提出了一种新的手征结构,该结构由介质板及其上下表面的双L谐振器组成.仿真结果表明,该结构在THz波段可实现对x-极化波的宽频段、多频段的90°极化偏转.特别是在2.56 THz处,这种新的结构能够实现对线极化波（x-极化波和y-极化波）的90°极化偏转,而此时的椭圆度约为0°.基于线极化波的电场分布,详细分析了极化偏转的物理机制.理论上,该手征结构也可以用来设计微波波段或近红外波段的90°极化偏转器.

英文摘要：

This paper proposes a novel chiral structure consisting of double L resonators fabricated on both sides of the dielectric substrate. Simulation results reveal that the structure can achieve broadband and multi-band 90°polarization rotation of x-polarization wave in a THz band. In particular, the chiral structure can realize 90°polarization rotation for x-polarized and y-polarized waves at 2.56 THz. Meanwhile, ellipticity of the linear polarization wave is about 0°. The physical mechanism of linearly polarized wave conversion based on electric fields is analyzed. The structure can also be used to design 90°polarization polarizer in other bands, for instance, microwave and near infrared regions.