Dielectric-lined cylindrical metallic THz waveguides: mode structure and dispersion.
Dielectric-lined cylindrical metallic THz waveguides: mode structure and dispersion.
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DOI：
10.1364/oe.18.001898
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发表时间：
2010-02
期刊：
影响因子：
3.8
通讯作者：
O. Mitrofanov;J. Harrington
中科院分区：
文献类型：
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作者：
O. Mitrofanov;J. Harrington
在太赫兹（THz）波的空心圆柱形金属波导的内表面沉积薄介电层，将传输损耗降低到1 dB/m以下。通过在波导输入端和输出端进行近场映射，实验研究了介质层对波导色散的影响。得到了低损耗波导模式、线偏振HE（11）模式和TE（01）模式的色散特性，并将实验结果与金属波导色散进行了比较。在HE（11）模式下，由于介电层引起的额外色散很小，相速度主要由波导半径决定。
Thin dielectric layers deposited on the inner surface of hollow cylindrical metallic waveguides for Terahertz (THz) waves reduce transmission losses below 1 dB/m. Impact of the dielectric layer on the waveguide dispersion is experimentally investigated by near-field mapping of guided short THz pulses at the input and the output of the waveguide. We obtain dispersion characteristics for the low-loss waveguide modes, the linearly-polarized HE(11) mode and the TE(01) mode, and compare the experimental results to the metallic waveguide dispersion. The additional dispersion due to the dielectric layer is found to be small for the HE(11) mode and the phase velocity is primarily determined by the waveguide radius.