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Sensors 2014, 14(3), 4831-4855; doi:10.3390/s140304831
Review

Recent Advances in Gas and Chemical Detection by Vernier Effect-Based Photonic Sensors

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Received: 18 December 2013 / Revised: 10 February 2014 / Accepted: 3 March 2014 / Published: 10 March 2014
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Abstract

Recently, the Vernier effect has been proved to be very efficient for significantly improving the sensitivity and the limit of detection (LOD) of chemical, biochemical and gas photonic sensors. In this paper a review of compact and efficient photonic sensors based on the Vernier effect is presented. The most relevant results of several theoretical and experimental works are reported, and the theoretical model of the typical Vernier effect-based sensor is discussed as well. In particular, sensitivity up to 460 μm/RIU has been experimentally reported, while ultra-high sensitivity of 2,500 μm/RIU and ultra-low LOD of 8.79 × 10−8 RIU have been theoretically demonstrated, employing a Mach-Zehnder Interferometer (MZI) as sensing device instead of an add drop ring resonator.
Keywords: Vernier effect; photonic sensors; silicon photonics; homogeneous sensing; ring resonator; MZI sensor Vernier effect; photonic sensors; silicon photonics; homogeneous sensing; ring resonator; MZI sensor
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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La Notte, M.; Troia, B.; Muciaccia, T.; Campanella, C.E.; De Leonardis, F.; Passaro, V.M.N. Recent Advances in Gas and Chemical Detection by Vernier Effect-Based Photonic Sensors. Sensors 2014, 14, 4831-4855.

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