Silver-Coated Teflon Tubes for Waveguiding at 1–2 THz

Research output: Contribution to journalArticlepeer-review


Colleges, School and Institutes

External organisations

  • Rutgers, The State University of New Jersey
  • University College London


Realization of single-mode low-loss waveguides for 1.0–2.0 THz remains a challenging problem due to large absorption in most dielectrics and ohmic losses in metals. To address this problem, we investigate dielectric-lined hollow metallic waveguides fabricated by coating 1-mm diameter 38-μm-thick polytetrafluoroethylene tubes with silver. These waveguides support a hybrid HE11 mode, which exhibits low attenuation and low dispersion. Quasi-single-mode propagation is achieved in the band of 1.0–1.6 THz, in which the hybrid HE11 mode is supported by the waveguide. In this band, the experimentally measured loss is ~20 dB/m (~0.046 cm−1), whereas the numerically computed loss is ~7 dB/m (~0.016 cm−1). The difference is attributed to additional losses in the dielectric layer, which can be reduced by using alternative polymers.


Original languageEnglish
Pages (from-to)542-555
Number of pages14
JournalJournal of Infrared, Millimeter, and Terahertz Waves
Issue number6
Early online date15 Apr 2015
Publication statusPublished - 1 Jun 2015


  • Near-field time-domain microscopy, Terahertz imaging, Terahertz spectroscopy, Terahertz waveguide, Ultrafast measurement