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Proceedings Paper

Enhanced temperature sensing with Vernier effect on fiber probe based on multimode Fabry-Perot interferometer
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Paper Abstract

Sensing at small dimensions in biological and medical environments requires miniaturized sensors with high sensitivity and measurement resolution. In this work a small optical fiber probe was developed to apply the Vernier effect, allowing for enhanced temperature sensing. Such effect is an effective way of magnifying the sensitivity of a sensor or measurement system in order to reach higher resolutions. The device is a multimode silica Fabry-Perot interferometer structured at the edge of a tapered multimode fiber by focused ion beam milling. The Vernier effect is generated from the interference between different modes in the Fabry-Perot interferometer. The sensor was characterized in temperature, achieving a sensitivity of -654 pm/°C in a temperature range from 30°C to 120°C. The Vernier effect provided a temperature sensitivity over 60-fold higher than the sensitivity of a normal silica Fabry-Perot interferometer without the effect. The temperature resolution obtained was 0.14°C, however this value was limited by the resolution of the OSA and can be improved further to less than 0.015°C.

Paper Details

Date Published: 3 October 2019
PDF: 5 pages
Proc. SPIE 11207, Fourth International Conference on Applications of Optics and Photonics, 112071I (3 October 2019);
Show Author Affiliations
André D. Gomes, Leibniz Institute of Photonic Technology (Germany)
INESC TEC (Portugal)
Univ. of Porto (Portugal)
Martin Becker, Leibniz Institute of Photonic Technology (Germany)
Jan Dellith, Leibniz Institute of Photonic Technology (Germany)
Mohammad I. Zibaii, Laser and Plasma Research Institute (Iran, Islamic Republic of)
Hamid Latifi, Laser and Plasma Research Institute (Iran, Islamic Republic of)
Manfred Rothhardt, Leibniz Institute of Photonic Technology (Germany)
Hartmut Bartelt, Leibniz Institute of Photonic Technology (Germany)
Orlando Frazão, INESC-TEC (Portugal)
Univ. of Porto (Portugal)


Published in SPIE Proceedings Vol. 11207:
Fourth International Conference on Applications of Optics and Photonics
Manuel Filipe P. C. M. Martins Costa, Editor(s)

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