Low-loss terahertz waveguide and its imaging application

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 ,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.