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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\u2010induced SPR (NPI\u2010SPR). This method adheres to phase\u2010matching 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\u2010SPR exhibits stronger field intensity in the external region and wavelength tuning capabilities (750 to 1250\u00a0nm) by varying Au NP diameters (20 to 90\u00a0nm). NPI\u2010SPR demonstrates refractive index sensitivities of 4000 to 4416\u00a0nm\u00a0per refractive index unit, nearly double those of typical SPR using the same optical fiber configuration sans Au NPs. Additionally, NPI\u2010SPR fiber configuration has demonstrated its applicability for developing biosensors, achieving a remarkable limit of detection of 0.004\u00a0n<jats:sc>m<\/jats:sc> for thrombin protein evaluation, a twenty\u2010fold enhancement compared to typical SPR. These findings underscore the intrinsic advantages of NPI\u2010SPR for sensing.<\/jats:p>","DOI":"10.1002\/adom.202400433","type":"journal-article","created":{"date-parts":[[2024,7,10]],"date-time":"2024-07-10T07:50:18Z","timestamp":1720597818000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Exciting Surface Plasmon Resonances on Gold Thin Film\u2010Coated Optical Fibers Through Nanoparticle Light Scattering"],"prefix":"10.1002","volume":"12","author":[{"given":"Jo\u00e3o P.","family":"Mendes","sequence":"first","affiliation":[{"name":"INESC TEC \u2013 Institute of Systems and Computer Engineering, Technology, and Science  Porto 4200\u2010465 Portugal"}]},{"given":"Paulo S. 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