In this work, a kind of magnetic photonic crystal fiber (MPCF) design based on yttrium iron garnet (YIG) structure filled with magnetic fluid (MF) is presented. In order to improve the magneto-optical (MO) properties of isolator devices, a numerical study has been developed to investigate the non-reciprocal TE-TM mode conversion. This technique consists in producing, under the influence of a magnetic field parallel to the direction of propagation, a coupling between the modes. The influence of gyrotropy and MF infiltration at different magnetic nanoparticle volume fraction concentrations is investigated. The results revealed that the mode conversion efficiency (R_m) increases with the increase of the MF concentration, while modal birefringence (∆n) is inversely proportional to its increase. Thus, the higher concentration provides the best results. For MF concentration and gyrotropy equal respectively to 1.75% and 0.0125, R_m is improved to over 93%, and ∆n is reduced to close to 10^–6. Whereas, R_m decreases to 89.59 and ∆n increases to 6 × 10^–6 for MF concentration equal to 0.25%. From these results, it can be seen that this MPCF filled with MF concentration equal to 1.75% is well suited to the design of MO isolators.

在这项工作中，提出了一种基于充有磁性流体（MF）的钇铁石榴石（YIG）结构的磁性光子晶体光纤（MPCF）设计。为了改善隔离器设备的磁光（MO）特性，已经进行了数值研究来研究非互易的TE-TM模式转换。该技术在于在平行于传播方向的磁场的影响下，产生模式之间的耦合。研究了在不同的磁性纳米粒子体积分数浓度下，回旋和MF渗透的影响。结果表明，模式转换效率（R _m）随着MF浓度的增加而增加，而模式双折射（∆n）与它的增加成反比。因此，较高的浓度可提供最佳结果。当MF浓度和回旋度分别等于1.75％和0.0125时，R _m提高到93％以上，而∆n降低到接近10 ^-6。而对于MF浓度等于0.25％的情况，R _m降低至89.59，而∆n升高至6×10 ^-6。从这些结果可以看出，这种填充了MF浓度为1.75％的MPCF非常适合MO隔离器的设计。