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<p>This study introduces a theoretically optimised Bloch surface wave (BSW) based sensing platform designed to detect Aflatoxin B1 mycotoxins. The platform utilises a binary one-dimensional photonic crystal composed of alternating Ta<sub>2</sub>O<sub>5</sub> and SiO<sub>2</sub> layers, with a carefully selected Ta<sub>2</sub>O<sub>5</sub> termination layer to enhance BSW excitation and its associated resonance features. The system’s optical response is modelled numerically using rigorous coupled-wave analysis of TM-polarised reflectance within a prism-coupled Kretschmann setup. The analysis reveals sharp reflectance dips under TM-polarized illumination, indicating BSW excitation when detecting aflatoxin B1 in aqueous solutions. The proposed sensor achieves a maximum sensitivity of 2.600&#xa0;nm/(ng/mL), a detection accuracy of 0.7246, a quality factor of 582.09, and a figure of merit of 1.978/(ng/mL), demonstrating its potential for label-free, real-time biosensing in chemical and biomedical fields.</p>

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Bloch surface wave sensor with optimised Ta2O5 termination for high-sensitivity detection of aflatoxin B1

  • 期刊论文

  • 发表日期：

    2026年1月22日

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  • Gaurav Singh,
  • Mahendra Kumar,
  • Vivek Singh

摘要

This study introduces a theoretically optimised Bloch surface wave (BSW) based sensing platform designed to detect Aflatoxin B1 mycotoxins. The platform utilises a binary one-dimensional photonic crystal composed of alternating Ta2O5 and SiO2 layers, with a carefully selected Ta2O5 termination layer to enhance BSW excitation and its associated resonance features. The system’s optical response is modelled numerically using rigorous coupled-wave analysis of TM-polarised reflectance within a prism-coupled Kretschmann setup. The analysis reveals sharp reflectance dips under TM-polarized illumination, indicating BSW excitation when detecting aflatoxin B1 in aqueous solutions. The proposed sensor achieves a maximum sensitivity of 2.600 nm/(ng/mL), a detection accuracy of 0.7246, a quality factor of 582.09, and a figure of merit of 1.978/(ng/mL), demonstrating its potential for label-free, real-time biosensing in chemical and biomedical fields.