FIBER OPTIC REFRACTIVE INDEX SENSORS BASED ON A BALL RESONATOR AND OPTICAL BACKSCATTER INTERROGATION
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Date
2020-10-30
Authors
Shaimerdenova, Madina
Ayupova, Takhmina
Sypabekova, Marzhan
Tosi, Daniele
Journal Title
Journal ISSN
Volume Title
Publisher
MDPI
Abstract
In this work, we introduced fabrication and interrogation of simple and highly sensitive fiber-optic refractive index (RI) sensors based on ball resonators built on the tip of single-mode fibers. The probes have been fabricated through a CO2 fiber splicer, with a fast (~600 s) and repeatable method. The ball resonator acted as a weak interferometer with a return loss below −50 dB and was interrogated with an optical backscatter reflectometer measuring the reflection spectrum. The ball resonators behaved as weak interferometers with a shallow fringe and a spectrum that appeared close to a random signal, and RI sensitivity could be measured either through wavelength shift or amplitude change. In this work, we reported four samples having sensitivity ranges 48.9–403.3 nm/RIU and 256.0–566.2 dB/RIU (RIU = refractive index unit). Ball resonators appeared as a sensitive and robust platform for RI sensing in liquid and can be further functionalized for biosensing. View Full-Text
Keywords: optical fiber sensors; optical resonators; refractive index sensors; optical backscatter reflectometry; ball resonator
Description
Keywords
optical fiber sensors, optical resonators, refractive index sensors, optical backscatter reflectometry, ball resonator, Research Subject Categories::TECHNOLOGY
Citation
Shaimerdenova, M., Ayupova, T., Sypabekova, M., & Tosi, D. (2020). Fiber Optic Refractive Index Sensors Based on a Ball Resonator and Optical Backscatter Interrogation. Sensors, 20(21), 6199. https://doi.org/10.3390/s20216199