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<p>Driven by the growing need for integrated and simultaneous monitoring of multiple physicochemical parameters in complex environments, a polarization-separated multifunctional photonic crystal fiber surface plasmon resonance sensor is proposed and numerically investigated. The proposed sensor integrates polarization multiplexing, in which two orthogonal polarization states are independently excited, with a four-channel independent-groove configuration. Magnetic fluid, seawater, single-stranded deoxyribonucleic acid, and polydimethylsiloxane are selectively filled into four distinct sensing channels, whose surfaces are further modified with gold films and titanium dioxide enhancement layers, allowing parallel detection of magnetic field, salinity, DNA concentration, and temperature. Numerical results show that, over detection ranges of 100–600 Gs for magnetic field intensity, 0-100‰ for salinity, 0.029–0.248&#xa0;g/cm<sup>3</sup> for DNA concentration, and 25–65&#xa0;°C for temperature, the proposed sensor achieves average sensitivities of 87 pm/Gs, 0.277&#xa0;nm/‰, 420.55&#xa0;nm/(g·cm<sup>− 3</sup>), and − 2.26&#xa0;nm/°C, respectively. Benefiting from the polarization-separation mechanism and multichannel sensing architecture, the proposed sensor exhibits high integration, high sensitivity, and simultaneous multiparameter sensing capability. These advantages make it a promising fiber-optic sensing platform for complex application scenarios, including marine environmental monitoring, biomedical analysis, and electrochemical sensing.</p>

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A Polarization-Separated PCF-SPR Multiparameter Sensor for Simultaneous Detection of Magnetic Field, Temperature, Salinity, and Biomolecules

  • 期刊论文

  • 发表日期：

    2026年8月5日

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  • Pingping Zhuang,
  • Mingzhe Du,
  • Zhenhui Zhang,
  • Xunzhi Li,
  • Zhengfeng Lv,
  • Boyang Cui,
  • Qinglan Tong,
  • Wen Chen,
  • Hong Li,
  • Haoran Wang

摘要

Driven by the growing need for integrated and simultaneous monitoring of multiple physicochemical parameters in complex environments, a polarization-separated multifunctional photonic crystal fiber surface plasmon resonance sensor is proposed and numerically investigated. The proposed sensor integrates polarization multiplexing, in which two orthogonal polarization states are independently excited, with a four-channel independent-groove configuration. Magnetic fluid, seawater, single-stranded deoxyribonucleic acid, and polydimethylsiloxane are selectively filled into four distinct sensing channels, whose surfaces are further modified with gold films and titanium dioxide enhancement layers, allowing parallel detection of magnetic field, salinity, DNA concentration, and temperature. Numerical results show that, over detection ranges of 100–600 Gs for magnetic field intensity, 0-100‰ for salinity, 0.029–0.248 g/cm3 for DNA concentration, and 25–65 °C for temperature, the proposed sensor achieves average sensitivities of 87 pm/Gs, 0.277 nm/‰, 420.55 nm/(g·cm− 3), and − 2.26 nm/°C, respectively. Benefiting from the polarization-separation mechanism and multichannel sensing architecture, the proposed sensor exhibits high integration, high sensitivity, and simultaneous multiparameter sensing capability. These advantages make it a promising fiber-optic sensing platform for complex application scenarios, including marine environmental monitoring, biomedical analysis, and electrochemical sensing.