Sensing structure based on surface plasmonic resonance in single mode optical fibers chemically etched

L. Coelho; J. M. Almeida; J. L. Santos; R. A. S. Ferreira; P. S. André; D. Viegas

doi:10.1117/12.2026809

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20 May 2013 Sensing structure based on surface plasmonic resonance in single mode optical fibers chemically etched

L. Coelho, J. M. Almeida, J. L. Santos, R. A. S. Ferreira, P. S. André, D. Viegas

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Proceedings Volume 8794, Fifth European Workshop on Optical Fibre Sensors; 87940E (2013) https://doi.org/10.1117/12.2026809
Event: Fifth European Workshop on Optical Fibre Sensors, 2013, Krakow, Poland

Abstract

Many optical systems based on Surface Plasmon Resonance (SPR) have been developed for work as refractometers, chemical sensors or even for measure the thickness of metal and dielectric thin films. These kinds of systems are usually large, expensive and cannot be used for remote sensing. Optical fiber sensors based on SPR has been widely studied for the last 20 years with several configurations mostly using multimode optical fibers with large cores and plastic claddings. Sensors based on SPR present very high sensitivity to refractive index variations when compared to the traditional refractive index sensors. Here we propose a SPR sensor based in a single mode fiber. The fiber end is chemically etched by emersion in a 48% hydrofluoric acid solution, resulting a single mode fiber with the cladding removed in a small section. A resonance dip around 1580 nm was attained in good agreement with the simulation scenario that takes into account the real characteristics of the fiber.

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L. Coelho, J. M. Almeida, J. L. Santos, R. A. S. Ferreira, P. S. André, and D. Viegas "Sensing structure based on surface plasmonic resonance in single mode optical fibers chemically etched", Proc. SPIE 8794, Fifth European Workshop on Optical Fibre Sensors, 87940E (20 May 2013); https://doi.org/10.1117/12.2026809

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