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<p>In this work, we have suggested a multilayer structure using surface plasmon resonance (SPR) and examined its efficacy as a sensor. A Platinum disulfide (PtS<sub>2</sub>) layer is positioned between a metal and black phosphorus (BP) layer in our suggested design, followed by layers of copper (Cu) and a sensing layer with the analyte on top. SPR is excited using a CaF<sub>2</sub> prism in the Kretschmann configuration, and analysis is done using the angle interrogation method. The multilayer design’s reflectivity and other parameters are computed using Sellmeier equations. We also investigate the impact of PtS<sub>2</sub> and BP with metal combinations. According to analysis, the suggested design’s sensitivity is noticeably higher than that of more recent SPR-based sensors. This study uses Cu, PtS<sub>2</sub>, and BP layers SPR sensors to achieve a sensitivity of 313.86°/RIU with a remarkable figure of merit (FoM) of 70.61/RIU. The penetration depth (PD) of 229.82 nm is also obtained at RI of 1.36 SM. Moreover, it is determined that the sensitivity for pregnancy detection is 261.26°/RIU. The proposed sensor is a suitable candidate for detecting biochemical and biological analytes.</p>

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Surface Plasmon Resonance Sensor with Multilayers Structure for Enhanced Sensitivity for Pregnancy Detection: Theoretical Analysis

  • 期刊论文

  • 发表日期：

    2025年5月13日

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  • Gufranullah Ansari,
  • Krunal Vaghela,
  • G. Ezhilarasan,
  • Byomakesh Dash,
  • G. Ramesh Babu,
  • Irwanjot Kaur,
  • Shaker Al-Hasnaawei,
  • Vikas Rathi,
  • Ankita Aggarwal,
  • Sanjeev Kumar Shah,
  • Alisha Vashisht,
  • Fethi Albouchi

摘要

In this work, we have suggested a multilayer structure using surface plasmon resonance (SPR) and examined its efficacy as a sensor. A Platinum disulfide (PtS2) layer is positioned between a metal and black phosphorus (BP) layer in our suggested design, followed by layers of copper (Cu) and a sensing layer with the analyte on top. SPR is excited using a CaF2 prism in the Kretschmann configuration, and analysis is done using the angle interrogation method. The multilayer design’s reflectivity and other parameters are computed using Sellmeier equations. We also investigate the impact of PtS2 and BP with metal combinations. According to analysis, the suggested design’s sensitivity is noticeably higher than that of more recent SPR-based sensors. This study uses Cu, PtS2, and BP layers SPR sensors to achieve a sensitivity of 313.86°/RIU with a remarkable figure of merit (FoM) of 70.61/RIU. The penetration depth (PD) of 229.82 nm is also obtained at RI of 1.36 SM. Moreover, it is determined that the sensitivity for pregnancy detection is 261.26°/RIU. The proposed sensor is a suitable candidate for detecting biochemical and biological analytes.