Single-mode—multimode—single-mode and lossy mode resonance-based devices: a comparative study for sensing applications
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In this work, a thin-film consisting of 15 bilayers (estimated thickness: 210 nm) of titanium (IV) oxide and poly(sodium 4-styrenesulfonate) is simultaneously deposited onto two optical fiber structures: a single-mode—multimode—single-mode (SMS) device and a lossy mode resonance (LMR)-based device. The performance of both structures, as refractometers and relative humidity sensors, is studied and compared. In both cases, the sensitivity of the LMR-based device (955 nm/RIU and 3.54 nm/RH %, respectively) highly improves the one of the SMS (142 nm/RIU and 0.3 nm/RH %). These facts can be taken into account when developing sensors based on either SMS or LMR technologies.
This work was supported by the Spanish Economy and Competitiveness Ministry project FEDER TEC2013-43679-R and by a Public University of Navarra pre-doctoral research grant. Authors would like to express their gratitude to Nadetech Innovations Inc. for the automation of the deposition processes.
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