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<p>In this work, a key innovation in the field of biochemical sensing has been realized. The sensor under consideration employs a prism incorporating a Silver-Gold (Ag–Au) bimetallic system-based surface plasmon resonance (SPR) configuration, which can interrogate wavelength at fixed incidence angle. This system has high Q-factor, good sensitivity, and exhibits enhanced chemical resistance and reliable analyte adsorption. We have designed the proposed sensor with thickness of 10&#xa0;mm, 10&#xa0;nm, and 40&#xa0;nm of prism, Ag, and Au respectively. The SPR reflectivity curves are analyzed for an interrogation wavelength range of 600 to 900&#xa0;nm in 50-nm interval with a fixed incidence angle of 50°. A simulation was carried out for three different biochemical samples: sucrose, methanol, and ethanol using Finite-Element Method (FEM). The result shows strong electric field localization near the metal dielectric-interface at resonance wavelength. The performance parameters include: Q-factor, sensitivity (S), signal to noise ratio (SNR), detection accuracy (D), and figure-of-merit (FOM), were assessed. The obtained results shows the highest Q-factor (1021.57), good sensitivity (365.31&#xa0;nm/RIU), maximum SNR (4.46 dB), minimum detection accuracy (0.22&#xa0;nm<sup>−1</sup>) and FOM (80.36 RIU<sup>−1</sup>) were achieved when the sample changed from methanol to ethanol. It was also found that the Q-factor is directly proportional to SNR. This research opens up new ways to develop SPR sensor technology and predicts its wide applications in biochemical and other related detection.</p>

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Bimetallic-Based SPR Wavelength Interrogating Sensor with High Q-factor for Biochemical Detection

  • 期刊论文

  • 发表日期：

    2026年2月12日

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  • Hameed Miyan,
  • Sanjaykumar C. Gowre,
  • Satishkumar Kannale

摘要

In this work, a key innovation in the field of biochemical sensing has been realized. The sensor under consideration employs a prism incorporating a Silver-Gold (Ag–Au) bimetallic system-based surface plasmon resonance (SPR) configuration, which can interrogate wavelength at fixed incidence angle. This system has high Q-factor, good sensitivity, and exhibits enhanced chemical resistance and reliable analyte adsorption. We have designed the proposed sensor with thickness of 10 mm, 10 nm, and 40 nm of prism, Ag, and Au respectively. The SPR reflectivity curves are analyzed for an interrogation wavelength range of 600 to 900 nm in 50-nm interval with a fixed incidence angle of 50°. A simulation was carried out for three different biochemical samples: sucrose, methanol, and ethanol using Finite-Element Method (FEM). The result shows strong electric field localization near the metal dielectric-interface at resonance wavelength. The performance parameters include: Q-factor, sensitivity (S), signal to noise ratio (SNR), detection accuracy (D), and figure-of-merit (FOM), were assessed. The obtained results shows the highest Q-factor (1021.57), good sensitivity (365.31 nm/RIU), maximum SNR (4.46 dB), minimum detection accuracy (0.22 nm−1) and FOM (80.36 RIU−1) were achieved when the sample changed from methanol to ethanol. It was also found that the Q-factor is directly proportional to SNR. This research opens up new ways to develop SPR sensor technology and predicts its wide applications in biochemical and other related detection.