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<p>This paper presents a highly sensitive methane sensor based on surface plasmon resonance (SPR) within a dual-core D-shaped photonic crystal fiber (PCF). The base fiber of this sensor adopts a simple double-layer Hexagonal geometry structure, which confines the dual-core fundamental mode by two different-sized pores and is coated with gold and methane-sensitive composite films on the D-shaped cladding surface. The research results show that within the range of methane concentration from 0 to 3.5%, the maximum and average wavelength sensitivities of this sensor are 56&#xa0;nm/% and 54.4&#xa0;nm/%, respectively. This sensor has a simple structure and features high sensitivity and stability, demonstrating great potential in methane leakage detection.</p>

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Dual-Core D-Shaped Photonic Crystal Fiber—Surface Plasmon Resonance (PCF-SPR) Methane High Sensitivity Sensor

  • 期刊论文

  • 发表日期：

    2025年9月19日

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  • Yanjun Zhang,
  • Zhizong Li,
  • Jiangpeng Deng,
  • Xingwei Li,
  • Yiming Jing

摘要

This paper presents a highly sensitive methane sensor based on surface plasmon resonance (SPR) within a dual-core D-shaped photonic crystal fiber (PCF). The base fiber of this sensor adopts a simple double-layer Hexagonal geometry structure, which confines the dual-core fundamental mode by two different-sized pores and is coated with gold and methane-sensitive composite films on the D-shaped cladding surface. The research results show that within the range of methane concentration from 0 to 3.5%, the maximum and average wavelength sensitivities of this sensor are 56 nm/% and 54.4 nm/%, respectively. This sensor has a simple structure and features high sensitivity and stability, demonstrating great potential in methane leakage detection.