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<p>A simple-structured hollow-core anti-resonant fiber (HC-ARF) polarization filter based on the surface plasmon resonance (SPR) effect is proposed. The polarization filter adopts fused silica as the substrate material and features a symmetric six-tube cladding structure. The gold films are deposited on the inner surface of the anti-resonant tubes along the <i>x</i>-direction to excite the SPR, while the nested anti-resonant tubes are introduced in the <i>y</i> direction to suppress the leakage loss of the <i>y</i>-polarized mode. The full-vector finite element method (FV-FEM) is used to systematically investigate the influence of core diameter, resonant tube inner diameter, nested tube inner diameter, gold film thickness and device length on the filtering performance. The results demonstrate that, under the optimized structural parameters, the polarization filter achieves a maximum polarization extinction ratio (<i>PER</i>) of -435 dB (-239 dB at 1.55&#xa0;μm). It offers a bandwidth of 353&#xa0;nm (1391&#xa0;nm to 1481&#xa0;nm and from 1518&#xa0;nm to 1781&#xa0;nm, which covers all the commonly used communication bands. The proposed filter features a simple structure and exhibits broad bandwidth and high <i>PER</i> performance, showing promising application prospects in the all-optical communication, optical fiber sensing and the other related fields.</p>

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Broadband Hollow-Core Anti-Resonant Fiber Polarization Filter Based on Surface Plasmon Resonance Effect

  • 期刊论文

  • 发表日期：

    2026年7月25日

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  • Erlei Wang,
  • Haitao Jiang,
  • Xiaodong Zhou,
  • Jia Li,
  • Tianyu Yang,
  • Haiming Jiang

摘要

A simple-structured hollow-core anti-resonant fiber (HC-ARF) polarization filter based on the surface plasmon resonance (SPR) effect is proposed. The polarization filter adopts fused silica as the substrate material and features a symmetric six-tube cladding structure. The gold films are deposited on the inner surface of the anti-resonant tubes along the x-direction to excite the SPR, while the nested anti-resonant tubes are introduced in the y direction to suppress the leakage loss of the y-polarized mode. The full-vector finite element method (FV-FEM) is used to systematically investigate the influence of core diameter, resonant tube inner diameter, nested tube inner diameter, gold film thickness and device length on the filtering performance. The results demonstrate that, under the optimized structural parameters, the polarization filter achieves a maximum polarization extinction ratio (PER) of -435 dB (-239 dB at 1.55 μm). It offers a bandwidth of 353 nm (1391 nm to 1481 nm and from 1518 nm to 1781 nm, which covers all the commonly used communication bands. The proposed filter features a simple structure and exhibits broad bandwidth and high PER performance, showing promising application prospects in the all-optical communication, optical fiber sensing and the other related fields.