Dielectric-lined cylindrical metallic THz waveguides: mode structure and dispersion

被引：60
|
作者：
Mitrofanov, Oleg [1 ]
Harrington, James A. [2 ]
机构：
[1] UCL, Dept Elect & Elect Engn, London WC1E 7JE, England
[2] Rutgers State Univ, Dept Mat Sci & Engn, Piscataway, NJ 08854 USA
来源：
OPTICS EXPRESS | 2010年 / 18卷 / 03期
基金：
英国工程与自然科学研究理事会;
关键词：
TERAHERTZ; TRANSMISSION; RADIATION; FIBERS; FILM;
D O I：
10.1364/OE.18.001898
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
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 HE11 mode and the TE01 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 HE11 mode and the phase velocity is primarily determined by the waveguide radius. (C) 2009 Optical Society of America
引用
收藏
页码：1898 / 1903
页数：6
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