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<p>To overcome the limitations in detection sensitivity associated with conventional single-layer membrane optical fiber sensors, we proposed a novel approach that integrates CeF<sub>3</sub> into a photonic crystal fiber surface plasmon resonance (PCF-SPR) structure. This innovation led to the development of a dual-core PCF-SPR sensor capable of detecting liquid refractive index (RI) and temperature. The sensor undergoes dual-side polishing, after which gold and CeF<sub>3</sub> films are sequentially deposited on its upper surface for RI detection. On the lower surface, a gold film and polydimethylsiloxane are deposited for temperature sensing. The asymmetric dual-channel configuration, featuring different polishing depths, effectively suppresses cross-sensitivity interference. Numerical simulations based on finite element analysis demonstrate that CeF<sub>3</sub>, as a modulating layer, can efficiently excite SPR in the near-infrared spectral range, thereby enhancing RI detection sensitivity. When the RI ranges from 1.33 to 1.39 and the temperature varies between 0℃ and 100℃, the sensor achieves maximum sensitivities of 25,800&#xa0;nm/RIU and 7.1&#xa0;nm/℃, respectively. The optimized sensor demonstrates approximately a fivefold increase in maximum RI sensitivity compared to conventional Au-based fiber SPR sensors (4900&#xa0;nm/RIU) within the same RI range. The key innovation of this work lies in the first-time application of CeF<sub>3</sub> in PCF-SPR sensors, enabling high-sensitivity RI and temperature detection. Moreover, the exceptional chemical stability and biocompatibility of CeF<sub>3</sub> offer unique advantages for biomolecular sensing applications.</p>

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Refractive Index and Temperature Dual-Parameter Sensor with Independent Channels Based on Asymmetric Dual-Core Photonic Crystal Fiber and Composite Membrane

  • 期刊论文

  • 发表日期：

    2025年10月31日

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  • Dongfang Li,
  • Shuguang Li,
  • Tianli Huo,
  • Zhibing Zhang,
  • Tianci Gao

摘要

To overcome the limitations in detection sensitivity associated with conventional single-layer membrane optical fiber sensors, we proposed a novel approach that integrates CeF3 into a photonic crystal fiber surface plasmon resonance (PCF-SPR) structure. This innovation led to the development of a dual-core PCF-SPR sensor capable of detecting liquid refractive index (RI) and temperature. The sensor undergoes dual-side polishing, after which gold and CeF3 films are sequentially deposited on its upper surface for RI detection. On the lower surface, a gold film and polydimethylsiloxane are deposited for temperature sensing. The asymmetric dual-channel configuration, featuring different polishing depths, effectively suppresses cross-sensitivity interference. Numerical simulations based on finite element analysis demonstrate that CeF3, as a modulating layer, can efficiently excite SPR in the near-infrared spectral range, thereby enhancing RI detection sensitivity. When the RI ranges from 1.33 to 1.39 and the temperature varies between 0℃ and 100℃, the sensor achieves maximum sensitivities of 25,800 nm/RIU and 7.1 nm/℃, respectively. The optimized sensor demonstrates approximately a fivefold increase in maximum RI sensitivity compared to conventional Au-based fiber SPR sensors (4900 nm/RIU) within the same RI range. The key innovation of this work lies in the first-time application of CeF3 in PCF-SPR sensors, enabling high-sensitivity RI and temperature detection. Moreover, the exceptional chemical stability and biocompatibility of CeF3 offer unique advantages for biomolecular sensing applications.