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<p>A dual-channel H-shape fiber (DCHF) sensor inlaid with a notched capillary is designed for the simultaneous detection of refractive index and temperature. The DCHF is fabricated by symmetrically etching two rectangular grooves on both sides of a multimode fiber (MMF) with a femtosecond laser and then embedding the DCHF into a notched capillary. By filling the analyte and thermo-sensitive liquid into the two rectangular grooves, a DCHF-based dual-parameter sensor is constructed for synchronous detection of the refractive index of the analyte as well as temperature. Furthermore, the Al wires are modified at positions closest to the core in both rectangular grooves to excite surface plasmon resonance (SPR) to enhance the sensitivity. The structural parameters of the DCHF-based dual-parameter sensor are systematically and comprehensively optimized to achieve superior sensing performance. Simulation results demonstrate that the sensor can synchronously detect refractive indexes in the range between 1.30 and 1.39 and temperature between 20&#xa0;°C and 60&#xa0;°C. The maximum refractive index sensitivity of 8,400&#xa0;nm/RIU and maximum temperature sensitivity of 37.6&#xa0;nm/°C represent a significant improvement over those of previously reported devices. Owing to the ease of analyte filling, non-interfering channels, high sensitivity, and simple fabrication process, the DCHF-based dual-parameter sensor has enormous potential in biochemical analysis, environmental monitoring, and other applications.</p>

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Surface Plasmon Resonance Dual-Channel H-shaped Fiber Sensor for Simultaneous Detection of Refractive Index and Temperature

  • 期刊论文

  • 发表日期：

    2025年7月18日

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  • Zhenshi Chen,
  • Chengkun Yang,
  • Haihao Fu,
  • Paul K. Chu

摘要

A dual-channel H-shape fiber (DCHF) sensor inlaid with a notched capillary is designed for the simultaneous detection of refractive index and temperature. The DCHF is fabricated by symmetrically etching two rectangular grooves on both sides of a multimode fiber (MMF) with a femtosecond laser and then embedding the DCHF into a notched capillary. By filling the analyte and thermo-sensitive liquid into the two rectangular grooves, a DCHF-based dual-parameter sensor is constructed for synchronous detection of the refractive index of the analyte as well as temperature. Furthermore, the Al wires are modified at positions closest to the core in both rectangular grooves to excite surface plasmon resonance (SPR) to enhance the sensitivity. The structural parameters of the DCHF-based dual-parameter sensor are systematically and comprehensively optimized to achieve superior sensing performance. Simulation results demonstrate that the sensor can synchronously detect refractive indexes in the range between 1.30 and 1.39 and temperature between 20 °C and 60 °C. The maximum refractive index sensitivity of 8,400 nm/RIU and maximum temperature sensitivity of 37.6 nm/°C represent a significant improvement over those of previously reported devices. Owing to the ease of analyte filling, non-interfering channels, high sensitivity, and simple fabrication process, the DCHF-based dual-parameter sensor has enormous potential in biochemical analysis, environmental monitoring, and other applications.