Reflection-based fibre-optic refractive index sensor using surface plasmon resonance

P. Hlubina; M. Kadulova; D. Ciprian; J. Sobota

doi:10.2971/jeos.2014.14033

Journal of the European Optical Society - Rapid publications, Vol 9 (2014)

Reflection-based fibre-optic refractive index sensor using surface plasmon resonance

P. Hlubina, M. Kadulova, D. Ciprian, J. Sobota

Abstract

A reflection-based fibre-optic refractive index sensor using surface plasmon resonance (SPR) in a thin metal film sputtered on a bare core of a multimode optical fibre is presented. The sensing element of the SPR fibre-optic sensor is the core of a step-index optical fibre made of fused silica with a gold film double-sided sputtered on the whole core surface, including the core end face. Consequently, a terminated reflection-based sensing scheme to measure the refractive indices of liquids is realized. The sensing scheme uses a wavelength interrogation method and the refractive index of a liquid is sensed by measuring the position of the dip in the reflected spectral intensity distribution. As an example, the aqueous solutions of ethanol with refractive indices in a range from 1.333 to 1.363 are measured. In addition, the increase in the sensitivity of the SPR fibre-optic refractive index sensor with the decrease of the fibre sensing length is demonstrated.

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