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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.
A new type of high birefringence hybrid lattice terahertz photonic crystal fiber is proposed, which achieves high mode birefringence by arranging a variety of grids for the sub-wavelength holes in the core and increasing the asymmetry of the structure. The results show that the hybrid lattice terahertz photonic crystal fiber has high birefringence (up to 10-2) and low limit loss over a wide frequency range, and passes through the finite element software COMSOL Multiphysics 4.0. It is feasible to change the birefringence or limit loss characteristics by changing some parameters of the optical fiber.Compared with the optical fiber of the same optical communication band, it is feasible to reduce the difficulty of micro-structure processing in the core due to the larger wavelength of the terahertz wave.