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Optical Engineering

Multimode fiber tapers for reproducible refractometric liquid detection
Author(s): Matej Komanec; Tomas Martan; Tomas Nemecek; Stanislav Zvanovec
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Paper Abstract

This paper describes the refractometric detection of liquids based on silica multimode optical fibers which were tapered to increase the evanescent-wave overlap for higher sensor sensitivity. By precisely monitoring the production process, consistent sample parameters were achieved. More than 200 tapers with a taper waist diameter range from 6.0 to 76.3  μm were prepared from polymer-clad silica and gradient-index multimode fibers. U-shaped fiber taper sensitivities were analytically compared with straight tapers with resulting intensity sensitivities of over 200%/RIU. Crucial parameters for real sensor applications, such as measurement repeatability, reproducibility, and long-term stability, were further studied for polymer-clad silica straight tapers. Long-term stability was monitored showing stable measurement results over a 6 months long interval. Measurement repeatability and reproducibility with standard deviations of 0.55%/RIU and 2.26%/RIU, respectively, were achieved.

Paper Details

Date Published: 8 April 2015
PDF: 6 pages
Opt. Eng. 54(4) 047102 doi: 10.1117/1.OE.54.4.047102
Published in: Optical Engineering Volume 54, Issue 4
Show Author Affiliations
Matej Komanec, Czech Technical Univ. in Prague (Czech Republic)
Tomas Martan, Czech Technical Univ. in Prague (Czech Republic)
Tomas Nemecek, Czech Technical Univ. in Prague (Czech Republic)
Stanislav Zvanovec, Czech Technical Univ. in Prague (Czech Republic)

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