Low-index terahertz pipe waveguides.
We propose and demonstrate a simple leaky structure for terahertz (THz) waveguiding. Different from previously reported air-core THz waveguides, in which a high-reflection-coated cladding layer is designed, the proposed structure here is a simple pipe with a large air core and a thin dielectric layer with uniform but low index. Using commercially available Teflon air pipes, we experimentally confirm that THz waves can be successfully guided in the central air core of 3-m-long pipes with excellent mode qualities, high coupling efficiencies, low attenuation constants, and controllable passband width.
Lai
Chih-Hsien
CH
Graduate Institute of Photonics and Optoelectronics and Department of Electrical Engineering, National Taiwan University, Taipei 10617, Taiwan.
Hsueh
Yu-Chun
YC
Chen
Hung-Wen
HW
Huang
Yuh-jing
YJ
Chang
Hung-chun
HC
Sun
Chi-Kuang
CK