Abstract

We propose a novel design of a slotted core photonic crystal fiber (PCF) that offers ultra low-loss and high birefringence attribute for efficient transmission of terahertz (THz) waves. A finite element method has been used to investigate the modal characteristics of the PCF. Our design incorporates an asymmetrical structure of air holes in the core to achieve high birefringence. Moreover, in the cladding region, we have a compact geometry of air holes arranged in five hexagonal layers to obtain lower dispersion. The simulated results show that the PCF exhibits simultaneously a low effective material loss of 0.025 cm^–1 and high modal birefringence of 0.0911, a flattened dispersion property of 0.65 ± 0.05 ps THz^–1 cm^–1 having a frequency range of 0.5 to 1.6 THz, core power fraction of 52% and very negligible confinement loss of about 1.05 × 10^–13 cm^–1. We believe our proposed PCF will bring about a promising improvement in high-speed broadband communications in the THz regime as well as numerous applications in the near future.

中文翻译：

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高双折射开缝纤芯光子晶体光纤，用于太赫兹波传播

摘要

我们提出了一种开槽芯光子晶体光纤（PCF）的新颖设计，该设计可提供超低损耗和高双折射属性，以有效传输太赫兹（THz）波。有限元方法已用于研究PCF的模态特征。我们的设计在纤芯中采用了不对称的气孔结构，以实现高双折射。此外，在包层区域，我们的气孔具有紧凑的几何形状，并以五个六边形层的形式排列，以获得较低的色散。仿真结果表明，PCF同时具有0.025 cm ^–1的低有效材料损耗和0.0911的高模态双折射，展平的色散特性为0.65±0.05 ps THz ^–1 cm ^–1频率范围为0.5到1.6 THz，核心功率分数为52％，限制损耗几乎可以忽略不计，约为1.05×10 ^–13 cm ^–1。我们相信，我们提议的PCF将在THz体制下带来高速宽带通信方面的光明前景，并在不久的将来带来众多应用。