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太赫兹纤维波导是太赫兹系统中重要的组成元件。为了实现太赫兹辐射的低损耗低色散传输,设计了一种以环烯烃共聚物为基质的多孔太赫兹纤维,并利用基于全矢量有限元法的商业软件COMSOL分析了该多孔太赫兹纤维的传输特性,着重考察了亚波长多孔纤芯的结构参数对传输特性的影响。结果表明:这种太赫兹纤维可以将模场能量很好的限制在亚波长多孔纤芯中传输,具有较小的有效模场面积、低的传输损耗和平坦近零色散等优良的传输特性;同时,通过增大多孔纤芯的占空比,可以将更多的模场能量限制在亚波长直径的空气孔洞中传输,并减小太赫兹纤维的有效模场面积和有效模式损耗,但同时会增大限制损耗和色散。
Terahertz fiber waveguide is an important component of the terahertz system. In order to realize the low loss and low dispersion transmission of terahertz radiation, a porous terahertz fiber based on cycloolefin copolymer was designed and the transmission of the porous terahertz fiber was analyzed by the commercial software COMSOL based on the full vector finite element method Characteristics, focusing on the sub-wavelength porous core structure parameters of the transmission characteristics. The results show that this kind of terahertz fiber can limit the mode field energy well in the subwavelength porous core and has the advantages of small effective mode field area, low transmission loss and flat near zero dispersion. At the same time, by increasing the duty ratio of the porous core, more mode field energy can be limited to the transmission of sub-wavelength diameter air holes and the effective mode field area and effective mode loss of the terahertz fiber can be reduced. At the same time Will increase the limit loss and dispersion.