低损耗太赫兹镀膜金属波导研究

Investigation on low-loss metallic terahertz waveguide with coating

在研究太赫兹波在镀膜二维平板金属波导传输时,损耗减小的机制和条件,发现只有TM模式在大间隙的金属镀膜波导传播时,其损耗小于不镀膜的金属波导。利用射线光学方法分析波导尺寸、膜厚度以及膜折射率等参数对TM模式损耗的影响,获得其损耗最低的优化结构参数。用转移矩阵理论对镀介质膜前后平板金属波导的损耗进行理论计算和分析,当介质为聚乙烯且厚度为0.06mm时,波导的损耗最小。所获结论对于太赫兹波导器件及太赫兹波低损耗波导研制具有较大的意义。

Studied on the transmission of terahertz wave in the metallic parallel plate waveguide coated by film, and finally found that transmission losses was less in the TM mode when the gap of plates was more wider. Analyzed the size of waveguide, the thickness and refractive index of film by the ray-optics method,and have got the optimal structural parameters with the lowest loss. Calculated and analyzed the loss of waveguide which had caoting or not by the transfer matrix. When polyethylene is 0.06 mm, the loss of waveguide was more lower. It＇s a great significance for the development of terahertz device and waveguide