基于 Ge\(_{20}\)Sb\(_{5})Se\(_{75}\) 的光学应用大固芯光子晶体光纤的结构优化

Ngoc Vo, Thi Minh, Danh Nguyen, An Nguyen Manh, Tham Tran Hong, V. Hoang, Lanh Chu Van, H. Le
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摘要

本文介绍了一种新设计的 Ge20Sb5Se75 大固芯光子晶体光纤(PCF),它具有第 1 环去除的方形晶格。利用各向异性完全匹配层的全矢量有限元法,我们对 PCF 在 1.5 µm 至 6.0 µm 波长范围内的色散特性进行了数值研究。结果表明,光子晶体光纤表现出多种色散特性,包括全常色散和反常色散,并具有一个或两个零色散波长(ZDW)。我们在数值模拟的基础上提出了两种具有最佳色散特性的设计。这些设计具有较小的晶格常数(Ʌ = 1.0 µm;Ʌ = 1.5 µm)和较低的填充因子(d/Ʌ = 0.3;d/Ʌ = 0.35)。此外,这些被选中的光纤还具有高非线性和低约束损耗的特点,是广泛光学应用的理想之选。
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Structure optimization of large-solid-core photonic crystal fibers based on Ge\(_{20}\)Sb\(_{5}\)Se\(_{75}\) for optical applications
This paper presents a new design of Ge20Sb5Se75 large-solid-core photonic crystal fiber (PCF) with a 1st-ring-removed square lattice. Using the full vector finite element method for anisotropic perfectly matched layers, we numerically examine the dispersion characteristics of the PCF in the wavelength range spanning from 1.5 µm to 6.0 µm. The results reveal that photonic crystal fibers exhibit a variety of dispersion properties, including all-normal and anomalous dispersion, featuring one or two zero dispersion wavelengths (ZDWs). We propose two designs with optimal dispersion characteristics based on our numerical simulations. These designs have small lattice constants (Ʌ = 1.0 µm; Ʌ = 1.5 µm) and low fill factors (d/Ʌ = 0.3; d/Ʌ = 0.35). Furthermore, these selected fibers offer high nonlinearity and low confinement loss, making them excellent candidates for a wide range of optical applications.
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