太赫兹光子带隙光纤的设计及传输特性模拟

Design and Propagation Properties Study on Terahertz Photonic Bandgap Fiber

摘要: 以新型太赫兹低损耗材料Topas环烯烃共聚物为基质，设计了一种基于带隙效应传输太赫兹波的空气芯聚合物光子晶体光纤。应用有限元方法对光纤的传输特性进行了分析。结果表明，该光纤在1.47 THz附近具有宽度约为0.2 THz的连续低损耗传输带宽，可以很好地将太赫兹波限制在空气芯中传输。在1.51 THz处获得了0.13 cm−1最小总损耗值。所设计的太赫兹Topas光子带隙光纤具备结构简单、易制备、直径小而易弯曲的特点。

Abstract: An air core photonic bandgap fiber is designed based on the novel Terahertz low-loss material Topas cyclic olefin copolymer. Propagation properties in the terahertz band of the fiber are investigated by using the finite element method. Numerical results indicate that the fiber has a low loss photonic bandgap within a broadband area about 0.2 THz around 1.47 THz, and THz wave is welled confined in the air core. Loss reaches the minimum value of 0.13 cm−1 at 1.51 THz. Struc- ture of designed terahertz Topas photonic bandgap fiber is simple, feasible for fabrication and bendable because of the relatively small diameter.