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<p>In this paper, we focus our study on the magnetic photonic crystal fiber (MPCF) made of cerium-substituted yttrium iron garnet (Ce: YIG), which contains magnetic fluid (MF) in the air holes. Like several other optical devices, isolators utilize a phenomenon called Faraday rotation (FR) to prevent reflections. FR rotates linearly polarized light when it travels parallel to a magnetic field. Cerium-substituted yttrium iron garnet (Ce: YIG) exhibits low optical absorption at telecommunication frequencies and a large Faraday rotation coefficient. The variations in mode conversion from TE to TM as a function of the gyrotropy parameter (g) for TE and TM polarizations are numerically simulated at the telecommunication wavelength <i>λ</i> = 1.55&#xa0;μm. We demonstrate FR and modal birefringence following polarization and gyrotropy. We observe an increase in FR and modal birefringence for TM and TE polarizations as <i>g</i> increases. We propose MPCF for integrated magneto-optical applications based on these findings. Moreover, a new isolator built into a photonic crystal fiber is constructed using Ce: YIG and MF. The results indicate that the two modes periodically exchange power. The impact of gyrotropy on the coupling length is evident. The results show that the two modes periodically exchange power. The influence of gyrotropy on the coupling length is evident. Additionally, the findings indicate that FR and modal birefringence directly affect TE-TM-mode conversion, with Faraday rotation (FR) reaching 8940°/cm and modal birefringence (ΔN) of 40.8881 × 10⁻<sup>4</sup>. This effect is also considerably stronger than in conventional fibers.</p>

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Theoretical study of magnetic photonic crystal fiber of cerium-substituted YIG (Ce: YIG) filled with magnetic fluid (Fe3O4)

  • 期刊论文

  • 发表日期：

    2025年12月12日

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  • Hamza Otmani,
  • Abdallah Azzaoui

摘要

In this paper, we focus our study on the magnetic photonic crystal fiber (MPCF) made of cerium-substituted yttrium iron garnet (Ce: YIG), which contains magnetic fluid (MF) in the air holes. Like several other optical devices, isolators utilize a phenomenon called Faraday rotation (FR) to prevent reflections. FR rotates linearly polarized light when it travels parallel to a magnetic field. Cerium-substituted yttrium iron garnet (Ce: YIG) exhibits low optical absorption at telecommunication frequencies and a large Faraday rotation coefficient. The variations in mode conversion from TE to TM as a function of the gyrotropy parameter (g) for TE and TM polarizations are numerically simulated at the telecommunication wavelength λ = 1.55 μm. We demonstrate FR and modal birefringence following polarization and gyrotropy. We observe an increase in FR and modal birefringence for TM and TE polarizations as g increases. We propose MPCF for integrated magneto-optical applications based on these findings. Moreover, a new isolator built into a photonic crystal fiber is constructed using Ce: YIG and MF. The results indicate that the two modes periodically exchange power. The impact of gyrotropy on the coupling length is evident. The results show that the two modes periodically exchange power. The influence of gyrotropy on the coupling length is evident. Additionally, the findings indicate that FR and modal birefringence directly affect TE-TM-mode conversion, with Faraday rotation (FR) reaching 8940°/cm and modal birefringence (ΔN) of 40.8881 × 10⁻4. This effect is also considerably stronger than in conventional fibers.