TY - JOUR
T1 - Silver-Coated Teflon Tubes for Waveguiding at 1–2 THz
AU - Navarro-Cía, Miguel
AU - Melzer, Jeffrey E.
AU - Harrington, James A.
AU - Mitrofanov, Oleg
N1 - Funding Information:
This work was supported in part by the Engineering and Physical Sciences Research Council (grant numbers EP/G033870/1 and EP/J017671/1), and the Royal Society (grant number UF080745). The work of M. Navarro-Cía was supported by Imperial College London through a Junior Research Fellowship.
Publisher Copyright:
© 2015, The Author(s).
PY - 2015/6/1
Y1 - 2015/6/1
N2 - 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.
AB - 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.
KW - Near-field time-domain microscopy
KW - Terahertz imaging
KW - Terahertz spectroscopy
KW - Terahertz waveguide
KW - Ultrafast measurement
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U2 - 10.1007/s10762-015-0157-5
DO - 10.1007/s10762-015-0157-5
M3 - Article
AN - SCOPUS:84937760862
SN - 1866-6892
VL - 36
SP - 542
EP - 555
JO - Journal of Infrared, Millimeter, and Terahertz Waves
JF - Journal of Infrared, Millimeter, and Terahertz Waves
IS - 6
ER -