Silver-Coated Teflon Tubes for Waveguiding at 1-2 THz
Silver-Coated Teflon Tubes for Waveguiding at 1-2 THz
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DOI：
10.1007/s10762-015-0157-5
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发表时间：
2015-06-01
影响因子：
2.9
通讯作者：
Mitrofanov, Oleg
中科院分区：
文献类型：
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作者：
Navarro-Cia, Miguel;Melzer, Jeffrey E.;Mitrofanov, Oleg
由于金属中的大部分介电损耗和欧姆损耗的大吸收，实现1.0-2.0 THz的单模低损耗波导仍然是一个具有挑战性的问题。为了解决这个问题，我们调查的介电内衬中空金属波导制造的涂层直径为1毫米，38 μ m厚的聚四氟乙烯管与银。这些波导支持混合HE 11模式，其表现出低衰减和低色散。在1.0-1.6 THz波段实现了准单模传输，其中混合HE 11模由波导支持。在该频带中，实验测量的损耗类似于20 dB/m（类似于0.046 cm（-1）），而数值计算的损耗类似于7 dB/m（类似于0.016 cm（-1））。这种差异归因于介电层中的额外损耗，这可以通过使用替代聚合物来减少。
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-mu m-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 similar to 20 dB/m (similar to 0.046 cm(-1)), whereas the numerically computed loss is similar to 7 dB/m (similar to 0.016 cm(-1)). The difference is attributed to additional losses in the dielectric layer, which can be reduced by using alternative polymers.