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Fiber evanescent wave spectroscopy based on IR fluorescent chalcogenide fibers

Abstract : Chalcogenide glasses, owing to their transparency in the infrared window and the appropriate solubility of rare earth, allows the generation of middle infrared (mid-IR) radiation from a near infrared or visible pumping source. These emitted mid-IR broad bands can probe the vibrational modes of several molecules, e.g. C-H, CO or C-Cl. Relying on this principle, a mid-IR optical sensor using the mid-IR fluorescence of Pr3+: Ga-Ge-Sb-S fibers has been developed. The detection principle is based on Fiber Evanescent Wave Spectroscopy (FEWS). The spectroscopic characterization of praseodymium ions (Pr3+) was performed in the near and mid-IR and is discussed on the basis of comparison with Judd-Ofelt calculations. The broad emission spectrum of the Pr3+: Ga-Ge-Sb-S fiber from 4 to 5 μm could enable the monitoring of multiple pollutants. In this study, chloroform detection is carried out via a novel technique derived from FEWS. In this way, an infrared sensor was developed, composed of a pumping source in near-IR, a mid-IR detector and a tapered Pr3+: chalcogenide fiber to enhance the detection sensitivity. These results demonstrate for the first time the feasibility of detecting molecules by FEWS using the mid-IR fluorescence emitted by rare earth ions doping chalcogenide fibers. This method is an effective alternative to the classical FEWS system, as RE doped chalcogenide fibers have the advantage of being a compact mid-IR source
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Submitted on : Friday, April 22, 2016 - 3:13:53 PM
Last modification on : Thursday, March 5, 2020 - 2:06:34 PM
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Radwan Chahal, Florent Starecki, Catherine Boussard-Plédel, Jean-Louis Doualan, Karine Michel, et al.. Fiber evanescent wave spectroscopy based on IR fluorescent chalcogenide fibers. Sensors and Actuators B: Chemical, Elsevier, 2016, 229, pp. 209-216. ⟨10.1016/j.snb.2016.01.091⟩. ⟨hal-01269748⟩

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