CST – Computer Simulation Technology

Title:
Silver-Coated Teflon Tubes for Waveguiding at 1–2 THz
Author(s):
Miguel Navarro-Cía, Jeffrey E. Melzer, James A. Harrington, Oleg Mitrofanov
Source:
Journal of Infrared, Millimeter, and Terahertz Waves
Vol./Issue/Date:
Vol 36
Year:
2016
Page(s):
pp 543 - 555
Keywords:
Near-field time-domain microscopy. Terahertz imaging, Terahertz spectroscopy. Terahertz waveguide, Ultrafast measuremen
Abstract:
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. Quasisingle-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.
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