中文摘要：

以新型聚合物材料Topas环烯烃共聚物（COC）为基质，设计了一种能够低损耗传输太赫兹波的多孔纤维。应用全矢量有限元方法对传输特性的研究结果表明，该Topas多孔纤维在太赫兹波段具有宽带低损耗、低色散的特性：0．4．1．5THz范围内的损耗小于0．2cm^-1；0．48-1．5THz范围内的色散为1．8±0．3ps·THz^-1·cm^-1。所设计的多孔纤维兼顾了结构简单、易于制备的特点。研究结论为Topas太赫兹波导的制备提供了理论指导。

英文摘要：

A kind of porous fiber for low-loss Terahertz wave guiding was designed based on Topas cyclic olefin copolymer （Topas COC）. Topas COC is a kind of novel Terahertz low-loss material. Terahertz wave was well confined in a series of subwavelength air holes, which were arranged in base material with triangular lattice. Propagation properties of the designed porous fiber were investigated by using the full-vector finite element method. The results indicated that the designed Topas porous fiber had low loss and low dispersion properties within Terahertz frequency. The loss was less than 0.2 cm-1 from 0.4 THz to 1.5 THz, and the dispersion was 1.8±0.3 ps/THz/cm within 0.48-1.5 THz. The designed fiber structure was relatively simple and feasible for fabrication. It can be fabricated by the thermo-drawing techniques of polymer preforms invented by our group. The results provided theoretical references for fabrication of Topas Terahertz low-loss and flexible fiber waveguides.