Exciting Surface Plasmon Resonances on Gold Thin Film-Coated Optical Fibers Through Nanoparticle Light Scattering

• Type: Article in International Scientific Journal
• Date: 2024

Authors

Mendes, JP (Author) Other; dos Santos, PSS (Author) Other; Dias, B (Author) Other; Núñez Sánchez, S (Author) Other; Pastoriza Santos, I (Author) Other; Pérez Juste, J (Author) Other; Carlos M Pereira (Author) FCUP; Jorge, PAS (Author) FCUP; de Almeida, JMMM (Author) FCUP; Coelho, LCC (Author) FCUP

Journal

The Journal is awaiting validation by the Administrative Services.

Title: ADVANCED OPTICAL MATERIALS

Vol. 12

ISSN: 2195-1071

Indexing

ISI Web of Knowledge - 1 Citation

Scopus - 1 Citation

Other information

Authenticus ID: P-010-ZPF

DOI: 10.1002/adom.202400433

Abstract (EN): Surface plasmon resonance (SPR) conventionally occurs at the interface of a thin metallic film and an external dielectric medium in fiber optics through core-guided light. However, this work introduces theoretical and experimental evidence suggesting that the SPR in optical fibers can also be induced through light scattering from Au nanoparticles (NPs) on the thin metallic film, defined as nanoparticle-induced SPR (NPI-SPR). This method adheres to phase-matching conditions between SPR dispersion curves and the wave vectors of scattered light from Au NPs. Experimentally, these conditions are met on an etched optical fiber, enabling direct interaction between light and immobilized Au NPs. Compared to SPR, NPI-SPR exhibits stronger field intensity in the external region and wavelength tuning capabilities (750 to 1250 nm) by varying Au NP diameters (20 to 90 nm). NPI-SPR demonstrates refractive index sensitivities of 4000 to 4416 nm per refractive index unit, nearly double those of typical SPR using the same optical fiber configuration sans Au NPs. Additionally, NPI-SPR fiber configuration has demonstrated its applicability for developing biosensors, achieving a remarkable limit of detection of 0.004 nm for thrombin protein evaluation, a twenty-fold enhancement compared to typical SPR. These findings underscore the intrinsic advantages of NPI-SPR for sensing. Surface plasmon resonance (SPR) typically occurs at the interface of a thin metallic film and a dielectric medium in fiber optics. This work presents evidence of nanoparticle-induced SPR (NPI-SPR) in optical fibers through light scattering from Au nanoparticles on the thin metallic film. NPI-SPR offers stronger field intensity, wavelength tuning, and enhanced refractive index sensitivities, making it advantageous for biosensing applications. image

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 12