低损耗太赫兹波导及其成像应用

Low-loss terahertz waveguide and its imaging application

高性能的太赫兹功能器件在太赫兹波的产生、传输及探测上都有着重要意义.报道了一种Kagome型低损耗太赫兹波导及其成像应用.首先根据反谐振波导理论设计了0. 1 THz处低损耗的太赫兹波导,其理论损耗低至0. 012 cm^(-1).然后使用3D打印技术制备波导实物,实验测得其损耗为0. 015 3 cm-1,波导末端光束发散角为6±0. 5°.最后基于该波导搭建了可重构太赫兹成像装置,分别实现了对隐藏刀片、矿石的反射和透射成像,在地下远距离勘探领域具有潜在的应用前景.

High-performance terahertz functional devices have great significance in the generation,transmission and detection of terahertz waves.This paper reports a Kagome-type low-loss terahertz waveguide and its imaging applications.Firstly,anti-resonant waveguide theory was used to design a Kagome terahertz waveguide with low loss transmission at 0.1 THz,which has a theoretical loss as low as 0.012 cm^-1.Secondly,the waveguide was fabricated by 3D printing technology.The experimental loss is 0.015 3 cm^-1,and the beam divergence angle at the end of the waveguide is about 6±0.5 degree.Finally,a reconfigurable terahertz imaging system was set up based on the waveguide,which realizes reflection and transmission imaging for a hidden blade and ore respectively.This technology has great application prospects in the underground long-distance exploration.