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<p>This study examines a novel design for hollow core metal fibers HCMF by systematically altering geometric factors. Various materials, such as gold, silver, aluminum, graphene, and silicon nitride Si<sub>3</sub>N<sub>4</sub>, were examined as substitutes for conventional metallic components to assess their influence on fiber performance at a wavelength of 9.5&#xa0;µm. The optical losses of each material were studied using Lumerical Ansys 2023 and the finite-difference time-domain approach. Results demonstrated that Si₃N₄ had outstanding optical characteristics, with negligible optical loss approaching zero at the specified wavelength, rendering it suitable for low-attenuation applications; regarding the selection of Si₃N₄ as the material for the metal wires in the hollow-core fiber, subsequent modifications to the geometry, such as wire widths and the spacing between the wires and the core, enhanced fiber performance, achieving an optical confinement loss as minimal as 10<sup>−18</sup>&#xa0;dB/m. This illustrates Si₃N₄ capability as an exceptional material for highly efficient hollow-core fiber configurations.</p>

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Investigating the influence of material composition and design parameters on optical loss in hollow core fibers at 9.5 µm

  • 期刊论文

  • 发表日期：

    2025年3月4日

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  • Zahraa Hummam,
  • Hamid Vahed,
  • Ali Pourziad

摘要

This study examines a novel design for hollow core metal fibers HCMF by systematically altering geometric factors. Various materials, such as gold, silver, aluminum, graphene, and silicon nitride Si3N4, were examined as substitutes for conventional metallic components to assess their influence on fiber performance at a wavelength of 9.5 µm. The optical losses of each material were studied using Lumerical Ansys 2023 and the finite-difference time-domain approach. Results demonstrated that Si₃N₄ had outstanding optical characteristics, with negligible optical loss approaching zero at the specified wavelength, rendering it suitable for low-attenuation applications; regarding the selection of Si₃N₄ as the material for the metal wires in the hollow-core fiber, subsequent modifications to the geometry, such as wire widths and the spacing between the wires and the core, enhanced fiber performance, achieving an optical confinement loss as minimal as 10−18 dB/m. This illustrates Si₃N₄ capability as an exceptional material for highly efficient hollow-core fiber configurations.