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<p>This study presents an optimization and simulation of a&#xa0;surface plasmon resonance-based optical fiber sensor with a&#xa0;D-shaped configuration, for the precise detection of aqueous nitro explosive. The proposed sensor undergoes simulation and analysis using finite element techniques. Optimization of the Au layer thickness, with a&#xa0;30 nm layer identified for maximum SPR curve reflection, Subsequently, a&#xa0;polyaniline layer was applied to enable selective detection. Varying sample concentrations interact uniquely with the polyaniline sensing surface, as concentration increases, the SPR dip shifts toward longer wavelengths like red-shift in the spectra. Simulating sensor lengths ranging from 1 to 5 mm provides valuable insights into sensor responses, showing improved detection accuracy and figure of merit as the sensor length decreases.</p>

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Detection of aqueous nitro explosives using SPR sensors integrated with D-shaped optical fibers

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • Abhishek Upadhyay,
  • Gaurav Sharma,
  • Rajiv Maurya,
  • Ankit Mishra,
  • Vivek Singh

摘要

This study presents an optimization and simulation of a surface plasmon resonance-based optical fiber sensor with a D-shaped configuration, for the precise detection of aqueous nitro explosive. The proposed sensor undergoes simulation and analysis using finite element techniques. Optimization of the Au layer thickness, with a 30 nm layer identified for maximum SPR curve reflection, Subsequently, a polyaniline layer was applied to enable selective detection. Varying sample concentrations interact uniquely with the polyaniline sensing surface, as concentration increases, the SPR dip shifts toward longer wavelengths like red-shift in the spectra. Simulating sensor lengths ranging from 1 to 5 mm provides valuable insights into sensor responses, showing improved detection accuracy and figure of merit as the sensor length decreases.