title: Low-index terahertz pipe waveguides.
abstract: 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.
authors.affiliation: Graduate Institute of Photonics and Optoelectronics and Department of Electrical Engineering, National Taiwan University, Taipei 10617, Taiwan.
authors.forename: Chih-Hsien
authors.initials: CH
authors.lastname: Lai
authors.forename: Yu-Chun
authors.initials: YC
authors.lastname: Hsueh
authors.forename: Hung-Wen
authors.initials: HW
authors.lastname: Chen
authors.forename: Yuh-jing
authors.initials: YJ
authors.lastname: Huang
authors.forename: Hung-chun
authors.initials: HC
authors.lastname: Chang
authors.forename: Chi-Kuang
authors.initials: CK
authors.lastname: Sun