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.
Design and Fabrication of Planar Optical Sensors Based on LSPR
De Luca, Andrea;Esposito, Flavio
;Campopiano, Stefania;Iadicicco, Agostino
2026-01-01
Abstract
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
