Reducing Transmission Losses in Hollow THz Waveguides
Reducing Transmission Losses in Hollow THz Waveguides
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DOI：
10.1109/tthz.2011.2159547
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发表时间：
2011-09-01
影响因子：
3.2
通讯作者：
Harrington, James A.
中科院分区：
文献类型：
--
作者：
Mitrofanov, Oleg;James, Richard;Harrington, James A.
对降低太赫兹（THz）波导中的材料吸收的研究已经导致了具有低至1dB/m的传输损耗的引导结构的发展。在太赫兹频率下表现出低损耗的波导中，有介质内衬的中空圆柱形金属波导。在此波导中的损耗降低归因于占主导地位的混合HE模式的理想轮廓。这种模式分布还导致相对低的色散和非常高的耦合效率。在这篇文章中，我们概述了太赫兹波的介质内衬空心圆柱形金属波导的特性，它们的设计原理和制造工艺。通过太赫兹近场成像和太赫兹时域光谱实验以及有限元法数值计算证实了模式分布对太赫兹频率下损耗和色散的影响。
Research on reducing material absorption in Terahertz (THz) waveguides has lead to development of guiding structures with transmission losses as low as 1 dB/m. Among waveguides that exhibit low loss at THz frequencies are the dielectric-lined hollow cylindrical metallic waveguides. Loss reduction in this waveguide is attributed to an ideal profile of the dominant hybrid HE mode. This mode profile also results in relatively low dispersion and very high coupling efficiency. In this contribution we overview properties of dielectric-lined hollow cylindrical metallic waveguides for THz waves, their design principles and the fabrication process. The impact of the mode profile on losses and dispersion at THz frequencies is confirmed experimentally by THz near-field imaging and THz time-domain spectroscopy and numerically by the finite element method.