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<p>We present a self-referenced plasmonic sensor with a high surface sensitivity based on Au nanoislands synthesized by thermal dewetting on a planar SiO<sub>2</sub>/metal bilayer deposited on a Si chip. The optical device displays two spectral features in reflection: a Fabry-Pérot resonance due to the SiO<sub>2</sub>/metal bilayer and a localized surface plasmon resonance (LSPR) associated with the Au nanoislands, serving as a reference and sensing signal, respectively. Surface sensitivity was investigated through the study of bovine serum albumin protein adsorption. The device exhibited a surface sensitivity of 0.2&#xa0;nm/(ng/cm<sup>2</sup>), an order of magnitude greater than other plasmonic devices based on Au nanoislands. The device response was theoretically modeled using rigorous coupled-wave analysis (RCWA) simulations, which showed strong agreement with the experimental results and provided design guidelines for further sensitivity improvement. The combination of high surface sensitivity, chip-based architecture, cost-effectiveness, and a straightforward Au nanostructure synthesis procedure positions this device as a promising self-referenced plasmonic sensor for biosensing applications.</p>

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High-Surface-Sensitive Self-Referenced Plasmonic Sensor Based on Au Nanoislands

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月4日

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  • Kimberly Melgarejo,
  • Melisa del Barrio,
  • Elena Benito-Peña,
  • Teona Mirea,
  • Carlos Angulo Barrios

摘要

We present a self-referenced plasmonic sensor with a high surface sensitivity based on Au nanoislands synthesized by thermal dewetting on a planar SiO2/metal bilayer deposited on a Si chip. The optical device displays two spectral features in reflection: a Fabry-Pérot resonance due to the SiO2/metal bilayer and a localized surface plasmon resonance (LSPR) associated with the Au nanoislands, serving as a reference and sensing signal, respectively. Surface sensitivity was investigated through the study of bovine serum albumin protein adsorption. The device exhibited a surface sensitivity of 0.2 nm/(ng/cm2), an order of magnitude greater than other plasmonic devices based on Au nanoislands. The device response was theoretically modeled using rigorous coupled-wave analysis (RCWA) simulations, which showed strong agreement with the experimental results and provided design guidelines for further sensitivity improvement. The combination of high surface sensitivity, chip-based architecture, cost-effectiveness, and a straightforward Au nanostructure synthesis procedure positions this device as a promising self-referenced plasmonic sensor for biosensing applications.