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<p>Surface plasmon resonance (SPR)–based biosensors have emerged as transformative tools in chemical and biological sensing owing to their high sensitivity, label-free operation, and real-time monitoring capabilities. In this study, we have investigated an advanced SPR sensor integrating various combinations of silver, indium selenide (In₂Se₃), and two-dimensional (2D) material composites, transition metal dichalcogenides (TMDCs), designed for the accurate detection of multiple chemicals. By optimizing the metal layer thickness and by taking advantage of the unique optical properties of TMDCs, the proposed heterogeneous design SPR sensor achieves better sensitivity and detection accuracy of 271°/RIU and 0.28, respectively across diverse refractive indices (RIs) of chemical analytes investigated in this work. In comparison to conventional metal-dielectric SPR-based sensors, the proposed heterostructure attributes a 34% enhancement in the electric field in the analyte region. Comprehensive modelling and computational analysis demonstrate the sensor’s excellent performance, including reduced resonance shift with a better figure of merit for a range of analytes. The results highlight the promise of material hybrid strategies for designing SPR sensors, providing opportunities for more extensive use including environmental monitoring, medical diagnosis and biochemical analysis.</p>

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Enhanced Electric Field–Driven Plasmonic Sensor with 2D Material Heterolayers for Chemical Sensing

  • 期刊论文

  • 发表日期：

    2025年10月7日

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  • Sourabh Jain,
  • Sandeep Boddu,
  • V. P. S. Reddy,
  • Yesudasu Vasimalla,
  • Sahiti Vankayalapati,
  • Santosh Kumar

摘要

Surface plasmon resonance (SPR)–based biosensors have emerged as transformative tools in chemical and biological sensing owing to their high sensitivity, label-free operation, and real-time monitoring capabilities. In this study, we have investigated an advanced SPR sensor integrating various combinations of silver, indium selenide (In₂Se₃), and two-dimensional (2D) material composites, transition metal dichalcogenides (TMDCs), designed for the accurate detection of multiple chemicals. By optimizing the metal layer thickness and by taking advantage of the unique optical properties of TMDCs, the proposed heterogeneous design SPR sensor achieves better sensitivity and detection accuracy of 271°/RIU and 0.28, respectively across diverse refractive indices (RIs) of chemical analytes investigated in this work. In comparison to conventional metal-dielectric SPR-based sensors, the proposed heterostructure attributes a 34% enhancement in the electric field in the analyte region. Comprehensive modelling and computational analysis demonstrate the sensor’s excellent performance, including reduced resonance shift with a better figure of merit for a range of analytes. The results highlight the promise of material hybrid strategies for designing SPR sensors, providing opportunities for more extensive use including environmental monitoring, medical diagnosis and biochemical analysis.