基于超材料的太赫兹偏振器研究

Terahertz polarizer research based on metamaterials

基于有限积分作为运算方式的三维全波仿真软件CST,设计太赫兹波段的非对称金属十字孔、金属开口圆环结构,通过引入偏振度与偏振转换效率来研究两种器件的偏振特性。基于偏振度的图像说明了当频率小于1.72THz时,所设计的偏振器件对Ex模式的入射电磁波有较好的透射特性,偏振度最大为70%;而当频率大于1.72THz时,器件对Ey模式的入射电磁波有较好的透射特性,偏振度约为32.5%。同样的金属开口环器件可以对平行入射的线偏振光进行有效的偏振态转换,并且偏振转换率最高能达到55%。研究结论为太赫兹传感器的研究提供参考。

Based on finite integral as the operation way of 3D full-wave simulation software CST,design the terahertz band asymmetric metal cross hole,metal opening ring structure. The degree of polarization and polarization conversion efficiency are introduced to study the polarization characteristics of the two kinds of devices. The polarizabilitybased images show that the polarization device has good transmission characteristics for incident electromagnetic waves in Ex mode at frequencies below 1.72 THz with a maximum polarization of 70%. When the frequency is greater than 1.72 THz,the polarization device has better transmission characteristics for incident electromagnetic waves in Ey mode,and the degree of polarization is about 32.5%. Meanwhile,the metal aperture ring device can lead to effective polarization state conversion for parallel incident linear polarized light,and the polarization conversion rate is up to 55%. The study provides a reference for the study of terahertz sensor.