Abstract Flexible terahertz fibers were designed for terahertz wave applications. In this paper, new terahertz fiber structures using polymer tube bundles were proposed. A triangle structure fiber with three-tube core and a hexagonal structure fiber with mono-tube core were considered. Mode field distributions in the proposed terahertz fibers and their propagation losses were numerically calculated using the finite element method. It was found that lower propagation loss was obtained for longer operating wavelength and smaller thickness of polymer tube due to the fraction increment of electromagnetic field propagating in the air. It was also clarified that lower propagation loss was brought by introducing the core tube material with lower absorption coefficient, where the propagation loss increased for longer wavelength due to the electromagnetic field expansion into the cladding region with larger absorption coefficient compared with the core material.

中文翻译：

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使用聚合物管束设计太赫兹光纤及其导模和传播损耗分析

摘要 柔性太赫兹光纤是为太赫兹波应用而设计的。在本文中，提出了使用聚合物管束的新型太赫兹纤维结构。考虑了三管芯的三角形结构光纤和单管芯的六边形结构光纤。所提出的太赫兹光纤中的模场分布及其传播损耗是使用有限元方法进行数值计算的。发现由于在空气中传播的电磁场的分数增量，对于更长的工作波长和更小的聚合物管厚度获得更低的传播损耗。还阐明了通过引入具有较低吸收系数的芯管材料带来了较低的传播损耗，