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We report a low-cost planar sensor based on localized surface plasmon resonance (LSPR). Borosilicate coverslips were functionalized with MPTMS (3-mercaptopropyl-trimethoxysilane) to anchor ~30 nm gold nanoparticles (AuNPs) synthesized by seeded growth. The AuNP properties were characterized using UV-Vis spectrometer, dynamic light scattering (DLS), ζ-potential, and transmission electron microscope (TEM). Combined with a multi-mode fiber interrogated setup, the functionalized substrates exhibited clear sensitivity to surrounding medium refractive index (SRI), with LSPR shifts exceeding 200 nm/RIU. These results demonstrate the feasibility of AuNP-coated planar waveguides as compact, reproducible, and versatile platforms for biosensing applications.

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Design and Fabrication of Planar Optical Sensors Based on LSPR

  • 会议论文

  • 发表日期：

    2026年

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  • Andrea De Luca,
  • Lucia Sansone,
  • Flavio Esposito,
  • Stefania Campopiano,
  • Federico Pecorari,
  • Michele Giordano,
  • Agostino Iadicicco

摘要

We report a low-cost planar sensor based on localized surface plasmon resonance (LSPR). Borosilicate coverslips were functionalized with MPTMS (3-mercaptopropyl-trimethoxysilane) to anchor ~30 nm gold nanoparticles (AuNPs) synthesized by seeded growth. The AuNP properties were characterized using UV-Vis spectrometer, dynamic light scattering (DLS), ζ-potential, and transmission electron microscope (TEM). Combined with a multi-mode fiber interrogated setup, the functionalized substrates exhibited clear sensitivity to surrounding medium refractive index (SRI), with LSPR shifts exceeding 200 nm/RIU. These results demonstrate the feasibility of AuNP-coated planar waveguides as compact, reproducible, and versatile platforms for biosensing applications.