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<p>It is vitally important to simultaneously measure the refractive index (RI) and temperature (<i>T</i>) for monitoring the process of diagnosis using optical fiber-based sensors. The development of dual-parameter optical fiber-based sensors for simultaneous measurement of RI and<i> T</i> often suffers from the problem of cross-sensitivity. In this paper, a Ω-shaped optical fiber-based SPR was proposed for RI and<i> T</i> simultaneous measurement through finite element method. In the bent region, a core–shell structure of gold nanoparticle@polydimethylsiloxane (AuNPs@PDMS) together with silver film (Ag-film) was decorated on the fiber surface. Two main peaks were found in the optical fiber-based SPR. The short wavelength peak generated by the Ag-film was only sensitive to RI. AuNPs@PDMS excited a long wavelength peak that was sensitive in response to the change of both RI and <i>T</i>. After optimizing the structure parameters of fiber bent radius (<i>R</i>), silver thickness (<i>t</i>), and AuNPs radius (<i>r</i>), the designed sensor exhibited excellent sensitivity of 2760&#xa0;nm/RIU and 0.49&#xa0;nm/°C for RI and<i> T</i> detection, respectively. With the advantages of simple structure and being easy to integrate, the presented sensor was expected to be employed for further research on cytosensor and therapy.&#xa0;</p>

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Core–Shell Structure of AuNPs@PDMS Nanoparticle-Modified Silver Film on Bent Optical Fiber to Design a SPR Sensor for Synchronous Detection of Temperature and Refractive Index

  • 期刊论文

  • 发表日期：

    2025年6月28日

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  • Mingyue Li,
  • Zewei Luo,
  • Xia Zhou,
  • Zixin Zhang,
  • Mengmeng Wang,
  • Bin Chen,
  • Li Xiao,
  • Yixiang Duan,
  • Liuying Li

摘要

It is vitally important to simultaneously measure the refractive index (RI) and temperature (T) for monitoring the process of diagnosis using optical fiber-based sensors. The development of dual-parameter optical fiber-based sensors for simultaneous measurement of RI and T often suffers from the problem of cross-sensitivity. In this paper, a Ω-shaped optical fiber-based SPR was proposed for RI and T simultaneous measurement through finite element method. In the bent region, a core–shell structure of gold nanoparticle@polydimethylsiloxane (AuNPs@PDMS) together with silver film (Ag-film) was decorated on the fiber surface. Two main peaks were found in the optical fiber-based SPR. The short wavelength peak generated by the Ag-film was only sensitive to RI. AuNPs@PDMS excited a long wavelength peak that was sensitive in response to the change of both RI and T. After optimizing the structure parameters of fiber bent radius (R), silver thickness (t), and AuNPs radius (r), the designed sensor exhibited excellent sensitivity of 2760 nm/RIU and 0.49 nm/°C for RI and T detection, respectively. With the advantages of simple structure and being easy to integrate, the presented sensor was expected to be employed for further research on cytosensor and therapy.