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

André D. Gomes; Martin Becker; Jan Dellith; Mohammad I. Zibaii; Hamid Latifi; Manfred Rothhardt; Hartmut Bartelt; Orlando Frazão

doi:10.1117/12.2527399

3 October 2019 Enhanced temperature sensing with Vernier effect on fiber probe based on multimode Fabry-Perot interferometer

André D. Gomes, Martin Becker, Jan Dellith, Mohammad I. Zibaii, Hamid Latifi, Manfred Rothhardt, Hartmut Bartelt, Orlando Frazão

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Proceedings Volume 11207, Fourth International Conference on Applications of Optics and Photonics; 112071I (2019) https://doi.org/10.1117/12.2527399
Event: IV International Conference on Applications of Optics and Photonics (AOP 2019), 2019, Lisbon, Portugal

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.

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André D. Gomes, Martin Becker, Jan Dellith, Mohammad I. Zibaii, Hamid Latifi, Manfred Rothhardt, Hartmut Bartelt, and Orlando Frazão "Enhanced temperature sensing with Vernier effect on fiber probe based on multimode Fabry-Perot interferometer", Proc. SPIE 11207, Fourth International Conference on Applications of Optics and Photonics, 112071I (3 October 2019); https://doi.org/10.1117/12.2527399

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KEYWORDS

Fabry–Perot interferometry

Interferometers

Biosensing

Multimode fibers

Optical fibers

Sensors

Superposition

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