In this study, we propose a terahertz photonic crystal fiber (PCF) including double rectangular air slots in the core region based on the conventional hexagonal lattice cladding. The rectangular air slots break the geometrical symmetry, which improves birefringence compared to previously reported slot core fibers. The proposed fiber consists of the reduced number of air slots to facilitate fabrication without performance deterioration. The designed PCF provides a very high birefringence of 0.93 at 1.05 THz with a low loss of 0.05 dB/cm and supports high birefringence for a wide range of frequency bands from 0.85 to 1.3 THz. We believe that this type of fiber could be applied to various efficient short-range signal transmission applications in the terahertz region.

在这项研究中，我们提出了一种太赫兹光子晶体光纤（PCF），该光纤在常规的六边形晶格包层的基础上，在核心区域中包括双矩形气隙。矩形气隙破坏了几何对称性，与先前报道的缝隙纤芯纤维相比，双折射得到了改善。提出的光纤由减少的气隙数量组成，以方便制造而不会降低性能。设计的PCF在1.05 THz时具有0.93的非常高的双折射，而损耗却只有0.05 dB / cm，并且在0.85至1.3 THz的宽频带范围内都支持高双折射。我们相信这种类型的光纤可以应用于太赫兹地区的各种有效的短程信号传输应用。