We present a new kind of dual-hole unit-based porous-core hexagonal photonic crystal fiber (H-PCF) with low loss and high birefringence in terahertz regime. The proposed fiber offers simultaneously high birefringence and low effective material loss (EML) in the frequency range of 0.5-0.85 THz with single-mode operation. An air-hole pair is used inside the core instead of elliptical shaped air holes to introduce asymmetry for attaining high birefringence; where the birefringence can be enhanced by rotating the dual-hole unit axis of orientation. The proposed H-PCF provides a birefringence of similar to 0.033 and an EML of 0.43 dB/cm at an operating frequency of 0.85 THz.
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机译：我们提出了一种新型的基于双孔单元的多孔核六边形光子晶体光纤（H-PCF），在太赫兹状态下具有低损耗和高双折射。所提出的光纤在单模操作的同时在0.5-0.85 THz的频率范围内提供了高双折射和低有效材料损耗（EML）。在纤芯内部使用气孔对代替椭圆形气孔，以引入不对称性以获得高双折射。可以通过旋转双孔单位定向轴来增强双折射。拟议的H-PCF在0.85 THz的工作频率下提供的双折射类似于0.033，EML为0.43 dB / cm。
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