Fibre-optic SPR sensor with a FBG interrogation scheme for readout enhancement
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2010
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Elsevier Science S A
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Abstract
In this work a new configuration of a refractometric sensor for aqueous solutions based on the combination of surface plasmon resonance (SPR) with fibre Bragg gratings (FBG) is presented. Two FBGs are selected having reflection maxima in each side of the plasmon resonance peak. These FBGs enable a different processing scheme for the information provided by the SPR transducer. This improved interrogation method increases the sensitivity and resolution of the sensor compared with those obtained with the usual method of tracking the spectral transmittance minimum and makes the system performance independent of optical source power fluctuations. The experimental results obtained with a double-layer uniform-waist tapered fibre show the feasibility of this approach and its applicability in SPR-based biosensors that must face very exigent measuring conditions.
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© 2009 Elsevier B.V.
This work has been partially supported by Spanish Government research project NESTOR, ref. CTM2004-03899; Comunidad de Madrid research project FUTURSEN, ref. S-0505/AMB-0374 and by Proyecto de Investigación Santander/Complutense, ref. PR34/07-15886. This work was supported partially by the Portuguese Government – Fundação para a Ciência e Tecnologia (FCT) through the grant SFRH/BD/30086/2006. N. Díaz-Herrera is thankful for the grant within the program ‘Becas Internacionales Universidad Complutense/Empresa Flores Valles 2008’.