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

Author:

Mendes João P.1,dos Santos Paulo S. S.12,Dias Bernardo13,Núñez‐Sánchez Sara4,Pastoriza‐Santos I.56ORCID,Pérez‐Juste Jorge56ORCID,Pereira Carlos M.78,Jorge Pedro A. S.18,de Almeida José M. M. M.19,Coelho Luís C. C.18

Affiliation:

1. INESC TEC – Institute of Systems and Computer Engineering, Technology, and Science Porto 4200‐465 Portugal

2. Faculty of Engineering University of Porto Porto 4200–465 Portugal

3. Institute of Physics Van der Waals‐Zeeman Institute for Experimental Physics University of Amsterdam Amsterdam 1012 WX the Netherlands

4. CF‐UM‐UP – Centre of Physics of University of Minho and University of Porto University of Minho Braga 4710‐057 Portugal

5. CINBIO Universidade Vigo Lagoas‐Marcosende Vigo Pontevedra 36310 Spain

6. SERGAS‐UVIGO – Galicia South Health Research Institute Vigo Pontevedra 36312 Spain

7. Department of Chemistry and Biochemistry Faculty of Sciences CIQUP/IMS – Center for Research in Chemistry of University of Porto/Institute of Molecular Sciences University of Porto Porto 4169‐007 Portugal

8. Faculty of Sciences University of Porto Porto 4169‐007 Portugal

9. University of Trás‐os‐Montes e Alto Douro Vila Real 5001–801 Portugal

Abstract

AbstractSurface 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.

Funder

Ministerio de Ciencia e Innovación

Secretaria Xeral de Investigación e Desenvolvemento, Xunta de Galicia

HORIZON EUROPE Framework Programme

Publisher

Wiley

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