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<p>In this study, we introduce a highly sensitive biosensor design utilizing a dual-side polished photonic crystal fiber (PCF) structure, evaluated through finite element method (FEM) simulations. The dual-side polishing approach enhances interaction with the evanescent field, thereby improving sensitivity while retaining the mechanical integrity of the structure. The sensor functions efficiently across a wide refractive index (RI) range of 1.21–1.40, making it suitable for detecting various biological fluids, gases, and chemical substances. It operates over a broad wavelength spectrum, spanning from 0.42 <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\upmu \)</EquationSource> </InlineEquation>m in the visible region to 1.0 <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\upmu \)</EquationSource> </InlineEquation>m in the near-infrared (NIR) region. The integration of gold (Au) as the plasmonic layer significantly extends both the sensitivity and dynamic detection range compared to traditional SPR-based PCF sensors. Simulation results demonstrate a peak amplitude sensitivity of 2535 (1/RIU) and a maximum wavelength sensitivity of 9500 (nm/RIU), achieving a high sensing resolution of <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(1.052 \times 10^{-5}\)</EquationSource> </InlineEquation>.</p>

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Dual-side polished optical fiber SPR biosensor for enhanced sensitivity and versatile detection

  • 期刊论文

  • 发表日期：

    2025年12月29日

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  • Ajit Kumar,
  • Amritanshu Pandey,
  • Sanjay Kumar Srivastava

摘要

In this study, we introduce a highly sensitive biosensor design utilizing a dual-side polished photonic crystal fiber (PCF) structure, evaluated through finite element method (FEM) simulations. The dual-side polishing approach enhances interaction with the evanescent field, thereby improving sensitivity while retaining the mechanical integrity of the structure. The sensor functions efficiently across a wide refractive index (RI) range of 1.21–1.40, making it suitable for detecting various biological fluids, gases, and chemical substances. It operates over a broad wavelength spectrum, spanning from 0.42 \(\upmu \) m in the visible region to 1.0 \(\upmu \) m in the near-infrared (NIR) region. The integration of gold (Au) as the plasmonic layer significantly extends both the sensitivity and dynamic detection range compared to traditional SPR-based PCF sensors. Simulation results demonstrate a peak amplitude sensitivity of 2535 (1/RIU) and a maximum wavelength sensitivity of 9500 (nm/RIU), achieving a high sensing resolution of \(1.052 \times 10^{-5}\) .