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<p>Optical sensors have been play an important role in many applications; for instance: in detecting chemical and biological pollutants in fluids, due to the high development in optical sensing technology. Due to its highly sensitive behavior and capability of sensing for label-free sensing, this phenomenon has been featured as a potent optical detection technique. This study focuses on the sensitivity of surface plasmon resonance (SPR) sensors using spectral interrogation and investigates ways to optimize their performance through the selection of metal layers and operating wavelengths. The study shows that transfer matrix method and spectral interrogation can increase their sensitivity. SPR simulations were done for gold (Au) layer with thickness (50 nm) and Polyvinyl Alcohol (PVA) polymer with various thicknesses (10–120 nm) deposited on glass prism type D-ZLAF50_Dense lanthanum flint. Simulation results of an SPR spectral interrogation sensor using a Gold-PVA-Air layer demonstrate its strong and sensitive response to variations in the PVA layer thickness, making it a promising candidate for sensing and analysis applications. SPR sensors are sensitive to many chemical substances at particular angles and thicknesses. These results affect SPR-based sensing system design and optimization, notably for visible-IR air pollution detection. SPR sensitivity is 13,830 nm/RIU at λ = (714–852) nm and 42°.</p>

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Theoretical biosensor design for gold-PVA spectral interrogation surface plasmon resonance layers

  • 期刊论文

  • 发表日期：

    2025年5月15日

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  • Farah Jawad Kadhum,
  • Ali Abid Dawood Al-Zuky,
  • Zainab I. Alasadi,
  • Huda Talal Sulaiman,
  • Sahar A. Mohammed

摘要

Optical sensors have been play an important role in many applications; for instance: in detecting chemical and biological pollutants in fluids, due to the high development in optical sensing technology. Due to its highly sensitive behavior and capability of sensing for label-free sensing, this phenomenon has been featured as a potent optical detection technique. This study focuses on the sensitivity of surface plasmon resonance (SPR) sensors using spectral interrogation and investigates ways to optimize their performance through the selection of metal layers and operating wavelengths. The study shows that transfer matrix method and spectral interrogation can increase their sensitivity. SPR simulations were done for gold (Au) layer with thickness (50 nm) and Polyvinyl Alcohol (PVA) polymer with various thicknesses (10–120 nm) deposited on glass prism type D-ZLAF50_Dense lanthanum flint. Simulation results of an SPR spectral interrogation sensor using a Gold-PVA-Air layer demonstrate its strong and sensitive response to variations in the PVA layer thickness, making it a promising candidate for sensing and analysis applications. SPR sensors are sensitive to many chemical substances at particular angles and thicknesses. These results affect SPR-based sensing system design and optimization, notably for visible-IR air pollution detection. SPR sensitivity is 13,830 nm/RIU at λ = (714–852) nm and 42°.