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Type: Journal article
Title: Surface plasmon scattering in exposed core optical fiber for enhanced resolution refractive index sensing
Author: Klantsataya, E.
François, A.
Ebendorff-Heidepriem, H.
Hoffmann, P.
Monro, T.
Citation: Sensors, 2015; 15(10):25090-25102
Publisher: MDPI AG
Issue Date: 2015
ISSN: 1424-8220
Statement of
Elizaveta Klantsataya, Alexandre François, Heike Ebendorff-Heidepriem, Peter Hoffmann, and Tanya M. Monro
Abstract: Refractometric sensors based on optical excitation of surface plasmons on the side of an optical fiber is an established sensing architecture that has enabled laboratory demonstrations of cost effective portable devices for biological and chemical applications. Here we report a Surface Plasmon Resonance (SPR) configuration realized in an Exposed Core Microstructured Optical Fiber (ECF) capable of optimizing both sensitivity and resolution. To the best of our knowledge, this is the first demonstration of fabrication of a rough metal coating suitable for spectral interrogation of scattered plasmonic wave using chemical electroless plating technique on a 10 μm diameter exposed core of the ECF. Performance of the sensor in terms of its refractive index sensitivity and full width at half maximum (FWHM) of SPR response is compared to that achieved with an unstructured bare core fiber with 140 μm core diameter. The experimental improvement in FWHM, and therefore the detection limit, is found to be a factor of two (75 nm for ECF in comparison to 150 nm for the large core fiber). Refractive index sensitivity of 1800 nm/RIU was achieved for both fibers in the sensing range of aqueous environment (1.33-1.37) suitable for biosensing applications.
Keywords: biosensing
microstructured optical fiber
surface plasmon resonance
surface plasmon scattering
Rights: © 2015 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (
DOI: 10.3390/s151025090
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