相位连续变化型太赫兹波带片

通过对太赫兹波段相位连续变化型波带片的系统研究,分析了特征尺寸与焦距、F数、预设频率、材料折射率等设计参数之间的关系,讨论了影响相位连续变化型波带片效率的几个主要因素。选取太赫兹透过率较高的泡沫聚乙烯和高密度聚乙烯材料,提出了设计方案,对所设计的波带片沿光轴方向太赫兹波强度变化以及焦平面太赫兹波强度变化给出了计算机模拟结果,并给出一组不同频率的波带片的特征参数。

Terahertz zone plates with continuous phase constructure

The planar zone plate,light weight, low loss and low cost with simple design, has been extensively studied and used at microwave and millimeter wave frequencies. However, the attenuation in conventional low loss materials increases at higher frequencies, and dimensional tolerances become smaller, making the fabrication of the terahertz zone plate more difficult. This investigation addressed the design of a zone plate with continuous phase for terahertz frequencies. The relation between the feature size and some important parameters of the zone plate was analyzed, including focal length, F-number, incident frequency and material refractive index, and some factors that affect the plate’s efficiency were discussed. The simulation of intensity distribution on the focal plane and optic axis