Materials, Photonic Devices, and Sensors

Multimode fiber tapers for reproducible refractometric liquid detection

[+] Author Affiliations
Matej Komanec, Tomas Martan, Tomas Nemecek, Stanislav Zvanovec

Czech Technical University in Prague, Department of Electromagnetic Field, Faculty of Electrical Engineering, Technicka 2, Prague 16627, Czech Republic

Opt. Eng. 54(4), 047102 (Apr 08, 2015). doi:10.1117/1.OE.54.4.047102
History: Received December 4, 2014; Accepted March 23, 2015
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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 76.3μm 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.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Matej Komanec ; Tomas Martan ; Tomas Nemecek and Stanislav Zvanovec
"Multimode fiber tapers for reproducible refractometric liquid detection", Opt. Eng. 54(4), 047102 (Apr 08, 2015). ; http://dx.doi.org/10.1117/1.OE.54.4.047102


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