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. 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 language | English |
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Pages (from-to) | 542-555 |
Number of pages | 14 |
Journal | Journal of Infrared, Millimeter, and Terahertz Waves |
Volume | 36 |
Issue number | 6 |
Early online date | 15 Apr 2015 |
DOIs | |
Publication status | Published - 1 Jun 2015 |
Keywords
- Near-field time-domain microscopy
- Terahertz imaging
- Terahertz spectroscopy
- Terahertz waveguide
- Ultrafast measurement
ASJC Scopus subject areas
- Instrumentation
- Electrical and Electronic Engineering
- Condensed Matter Physics
- Radiation