针对太赫兹波的特点, 利用折射率匹配耦合原理, 设计了一种垂直双空芯结构的偏振分离器件。与传统的分离器件相比, 它具有以下优点: (1) 双芯折射率匹配度高, 使得对应的偏振模式所需要的分离长度很短; (2) 采用双空气纤芯结构, 降低材料对太赫兹波的吸收损耗; (3) 通过设计, 令其发生耦合的两个纤芯相互垂直, 从而使y偏振模的折射率曲线部分重合, 大大扩展了工作带宽的范围, 其工作带宽达到了0.17 THz。此外, 由于器件结构简单对称, 降低了光纤的设计和制备难度, 使其在太赫兹网络中具有很高的应用价值。

In terahertz frequencies, using refractive index matching coupling principle, a broadband polarization splitter based on orthogonal hollow core was designed. Compared with the traditional separation device, it has the following advantages: (1) the refractive index matching degree of dual-core is high, making the separation length of the corresponding polarization mode is very short; (2) the dual-core are filled with air, which can reduce the absorption loss to THz wave; (3) through the design, making the dual-core perpendicular, thus the refractive index curve of y polarization mode overlap with that of x polarization mode, greatly expanded the scope of bandwidth. Its working bandwidth reached 0.17 THz. In addition, because of its structure is simple and symmetry, the THz fiber is easy to fabricate, which has a high application value in the terahertz network.