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Angular surface plasmon resonance-based sensor with a silver nanocomposite layer for effective water pollution

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Summary

This study introduces novel angular surface plasmon resonance (ASPR) sensor structures for detecting polluted water and sodium chloride. The optimized hybrid heterostructure demonstrates high sensitivity and efficiency for environmental monitoring.

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Area of Science:

  • Optoelectronics
  • Chemical Sensing
  • Nanomaterials

Background:

  • Angular surface plasmon resonance (ASPR) is a sensitive technique for detecting analytes.
  • Existing ASPR sensors face challenges in sensitivity and efficiency for complex samples like polluted water.

Purpose of the Study:

  • To design and optimize conventional and hybrid heterostructure ASPR sensors.
  • To enhance sensitivity and efficiency for detecting polluted water and sodium chloride concentrations.

Main Methods:

  • Utilized the transfer matrix method to simulate reflectance spectra in the visible region.
  • Employed angular interrogation based on the Kretschmann configuration.
  • Optimized five substrate parameters: Ag-metal thickness, dielectric material type/thickness, host material, and nanoparticle volume fraction.

Main Results:

  • Achieved a high sensitivity of 448.1°.
  • Reported a signal-to-noise ratio of 0.787 and sensor resolution of 0.284°.
  • Obtained a figure of merit of 78.766 RIU⁻¹.

Conclusions:

  • The proposed hybrid heterostructure ASPR sensor design offers excellent performance.
  • The sensor is a promising candidate for accurate and efficient detection of low concentrations of pollutants and sodium chloride.