Fiber evanescent wave spectroscopy based on IR fluorescent chalcogenide fibers

SENSORS AND ACTUATORS B-CHEMICAL

卷:229

Article

Chahal, Radwan¹  Starecki, Florent¹  Boussard-Pledel, Catherine¹  Doualan, Jean-Louis²  Michel, Karine³  Brilland, Laurent⁴  Braud, Alain²  Camy, Patrice²  Bureau, Bruno¹  Nazabal, Virginie¹ 

[1] Univ Rennes 1, Equipe Verres & Ceram, ISCR, UMR 6226,CNRS, Campus Beaulieu, F-35042 Rennes, France

[2] Univ Caen, Ctr Rech Ions Mat & Photon CIMAP, UMR 6252, CEA,CNRS,ENSI Caen, F-14050 Caen, France

[3] Bur Rech Geol & Minieres, BP 6009, F-45060 Orleans, France

[4] PERFOS, R&D Platform Photon Bretagne, 11 Rue Louis de Broglie, F-22300 Lannion, France

关键词: Chalcogenide glasses;    Fibers;    FEWS;    Praseodymium;    Mid-IR optical sensor;    Chloroform;   

DOI  :  10.1016/j.snb.2016.01.091

来源: Elsevier

【 摘 要 】

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, C=O or C-Cl. Relying on this principle, a mid-IR optical sensor using the mid-IR fluorescence of 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 mu m 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. (C) 2016 Elsevier B.V. All rights reserved.

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