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<p>A surface plasmon resonance (SPR)–based sensor, which consists of aluminum (Al) as a plasmonic metal and zinc sulfide (ZnS) as the dielectric layer, has been proposed in a modified Kretschmann configuration. An engineered layer of fluorinated graphene (FG) as a 2D nanomaterial has been included in the proposed configuration for better interaction with the bio-analyte. The proposed sensing device is designed using the transfer matrix and finite element methods for angle interrogation at a wavelength of 1550&#xa0;nm, considering performance parameters like sensitivity, SPR linewidth, detection accuracy, and figure of merit (FOM). The multilayered engineered plasmonic sensor is found to have a maximum value of sensitivity (242.85°/RIU) and enhanced FOM (451.68 RIU<sup>−1</sup>). The effect of different glass substrates, plasmonic metals, dielectric materials, and 2D nanomaterials on the performance parameters has been studied. Finally, the engineered plasmonic biosensor {CaF<sub>2</sub>-Al (30&#xa0;nm)-ZnS (2&#xa0;nm)-FG} is used to detect different malaria stages by distinguishing healthy and malaria-infected red blood cells, showing its potential by significant improvement in sensitivity and FOM compared to many of the existing simulation-based SPR designs, indicating a strong potential for high-performance biosensing applications.</p>

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Numerical Study of a High-Performance SPR Sensor Using ZnS and Fluorinated Graphene with Consideration of Experimental Parameters

  • 期刊论文

  • 发表日期：

    2025年8月18日

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  • R. Runthala,
  • G. Tejaswi,
  • P. Arora

摘要

A surface plasmon resonance (SPR)–based sensor, which consists of aluminum (Al) as a plasmonic metal and zinc sulfide (ZnS) as the dielectric layer, has been proposed in a modified Kretschmann configuration. An engineered layer of fluorinated graphene (FG) as a 2D nanomaterial has been included in the proposed configuration for better interaction with the bio-analyte. The proposed sensing device is designed using the transfer matrix and finite element methods for angle interrogation at a wavelength of 1550 nm, considering performance parameters like sensitivity, SPR linewidth, detection accuracy, and figure of merit (FOM). The multilayered engineered plasmonic sensor is found to have a maximum value of sensitivity (242.85°/RIU) and enhanced FOM (451.68 RIU−1). The effect of different glass substrates, plasmonic metals, dielectric materials, and 2D nanomaterials on the performance parameters has been studied. Finally, the engineered plasmonic biosensor {CaF2-Al (30 nm)-ZnS (2 nm)-FG} is used to detect different malaria stages by distinguishing healthy and malaria-infected red blood cells, showing its potential by significant improvement in sensitivity and FOM compared to many of the existing simulation-based SPR designs, indicating a strong potential for high-performance biosensing applications.