高双折射的混合格子太赫兹光子晶体光纤的设计与研究
Design and study of high birefringent terahertz photonic crystal fiber with hybrid crystal lattice
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摘要: 提出了一种新型高双折射的混合格子太赫兹光子晶体光纤,通过对芯区亚波长尺寸的空气孔进行多种格子组合排列,增加结构的非对称性实现高的模式双折射.全文仿真建模采用专业的有限元计算软件COMSOL Multiphysics 4.0,结果表明:混合格子太赫兹光子晶体光纤在很宽的频率范围内都具有较高的双折射(达到10-2)和低的限制损耗,且通过改变光纤的某些参数可以灵活地控制其双折射或限制损耗特性.相比于同类光通信波段光纤,由于太赫兹波波长较大,能够降低芯区微结构加工的难度,具有可行性.Abstract: In this paper,we propose a novel high birefringent terahertz(THz) photonic crystal fiber(PCF) with subwavelength circular air hole pairs in the core which are arranged as a hybrid crystal lattice structure.And its high mode birefringence is realized by reducing structure symmetry in core.A professional software COMSOL Multiphysics 4.0 is used for modeling,and the simulation results show that this kind of THz PCF exhibits a high birefringence on a level of 10-2and low confinement loss over a wide THz frequency range.Moreover,the birefringence or confinement loss can be controlled flexibly by adjusting some fiber parameters.Compared with a similar structure PCF for the optical communication,the THz PCF is easier to practically fabricate,owing to its large wavelength size.
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