A Design of a Slow-group-velocity and Low-loss Bragg Waveguide in Terahertz

被引:0
|
作者
Yao, H. Y. [1 ]
Jiang, J. Y. [1 ]
Cheng, Y. S. [1 ]
Chen, Z. Y. [1 ]
Her, T. H. [2 ]
Chang, T. H. [1 ]
机构
[1] Natl Tsing Hua Univ, Dept Phys, Hsinchu 30013, Taiwan
[2] Univ N Carolina, Dept Phys & Opt Sci, Ctr Optoelect & Opt Commun Univ, Charlotte, NC 28223 USA
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中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
We propose a design of small-core multiple-layer Bragg waveguide for guiding the THz signal by TE01 mode, which is composed of alternating un-doped silicon (high refractive index) and high-density polyethylene (low refractive index). The group velocity of the THz wave traveling inside this small-core waveguide slows down to below 0.5c, while the propagation loss is less than 0.3 dB per centimeter ranging from 0.95 THz to 1.2 THz, which is better than the traditional metallic tube. Furthermore, a novel scheme is proposed to excite and retrieve the very high-purity TE01 mode in a Bragg waveguide by employing additional Y-type TE01 mode converters. Based on this scheme, for the first time, one is possible to characterize the Bragg TE01 mode in experiment or further apply such wave-guiding system in THz communication or beam-wave interaction for THz generation.
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