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<p>A&#xa0;novel surface plasmon resonance (SPR) sensor is presented&#xa0;utilizing a BK7 prism, copper (Cu), silicon dioxide (SiO<sub>2</sub>), nickel (Ni), and black phosphorus (BP) for enhanced biomolecule sensing in the refractive index (RI) range of 1.33 – 1.335. The combination of Cu and Ni offers strong plasmonic properties, while BP tunable bandgap and superior light-matter interactions significantly improve sensitivity. SiO<sub>2</sub> enhances chemical stability and enables surface functionalization, making the sensor robust for real-world applications. The high sensitivity of 417.11°/RIU is attained with a remarkable quality factor (QF) of 102.19/RIU at minimum reflectance (<i>R</i><sub>min</sub>), outperforming existing SPR sensors in terms of both sensitivity and reliability. The maximum sensitivity of 479.10°/RIU is achieved. The proposed design addresses key challenges in SPR sensing, including environmental stability, layer optimization, and sensitivity enhancement, positioning it as a promising platform for advanced biomolecular detection.</p> Graphical abstract <p></p>

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Plasmonic sensor design: Cu-SiO₂-Ni-black phosphorus for enhanced surface plasmon resonance in visible regime

  • 期刊论文

  • 发表日期：

    2025年1月31日

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  • Hiba Bouandas,
  • Rajeev Kumar,
  • Mostefa Benhaliliba,
  • Shivam Singh,
  • Lalit Garia

摘要

A novel surface plasmon resonance (SPR) sensor is presented utilizing a BK7 prism, copper (Cu), silicon dioxide (SiO2), nickel (Ni), and black phosphorus (BP) for enhanced biomolecule sensing in the refractive index (RI) range of 1.33 – 1.335. The combination of Cu and Ni offers strong plasmonic properties, while BP tunable bandgap and superior light-matter interactions significantly improve sensitivity. SiO2 enhances chemical stability and enables surface functionalization, making the sensor robust for real-world applications. The high sensitivity of 417.11°/RIU is attained with a remarkable quality factor (QF) of 102.19/RIU at minimum reflectance (Rmin), outperforming existing SPR sensors in terms of both sensitivity and reliability. The maximum sensitivity of 479.10°/RIU is achieved. The proposed design addresses key challenges in SPR sensing, including environmental stability, layer optimization, and sensitivity enhancement, positioning it as a promising platform for advanced biomolecular detection.

Graphical abstract