A comprehensive experimental investigation of sensitivity enhancement for optical fiber humidity sensor employing localized surface plasmon resonance spectroscopy

R. Aneesh; Sunil Khijwania

doi:10.1117/12.2026762

20 May 2013 A comprehensive experimental investigation of sensitivity enhancement for optical fiber humidity sensor employing localized surface plasmon resonance spectroscopy

R. Aneesh, Sunil Khijwania

Author Affiliations +

Proceedings Volume 8794, Fifth European Workshop on Optical Fibre Sensors; 87941M (2013) https://doi.org/10.1117/12.2026762
Event: Fifth European Workshop on Optical Fibre Sensors, 2013, Krakow, Poland

Abstract

An optical fiber relative humidity (RH) sensor exploiting Localized Surface Plasmon Resonance (LSPR) is designed in order to achieve a linear response over a large dynamic range with an optimized sensitivity. To further enhance the sensitivity, in-house developed gold nanoparticle film was also synthesized onto a U-shaped and an etched-core region of the optical fiber. A throughout linear response over a dynamic range of ~20-90% RH with a very high sensitivity is observed. Importantly, reducing the core diameter resulted in four time sensitivity enhancement. In addition, the sensor response was observed to be highly reversible and repeatable.

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R. Aneesh and Sunil Khijwania "A comprehensive experimental investigation of sensitivity enhancement for optical fiber humidity sensor employing localized surface plasmon resonance spectroscopy", Proc. SPIE 8794, Fifth European Workshop on Optical Fibre Sensors, 87941M (20 May 2013); https://doi.org/10.1117/12.2026762

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KEYWORDS

Sensors

Humidity

Optical fibers

Nanoparticles

Fiber optics sensors

Surface plasmons

Gold

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