Personne :
Ari, Julien

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Ari
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Julien
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Université Laval. Centre d'optique, photonique et laser
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ncf11918939
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Auteur: Messaddeq, Younès ×

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  • Publication
    Accès libre
    Co-doped Dy3+ and Pr3+ Ga5Ge20Sb10S65 fibers for mid-infrared broad emission
    (Optical Society of America, 2018-06-13) Ledemi, Yannick; Starecki, Florent; Ari, Julien; Boussard-Plédel, Catherine; Messaddeq, Younès; Doualan, J. L. (Jean Louis); Braud, Alain; Bureau, Bruno; Nazabal, Virginie
    Rare earth ion doped materials are means to obtain cost-effective infrared light sources, with enough brilliance for applications such as gas sensing. Within a sulfide matrix, the simultaneous luminescence of both Pr3+ and Dy3+ in the Ga5Ge20Sb10S65 glass is reported. The use of these two rare earths is giving rise to a broad continuous luminescence in the 2.2–5.5 µm wavelength range, which could be used as a mid-infrared light source for gas-sensing applications. The demonstration of CO2 and CH4 detection using a fiber drawn from these materials is reported.
  • Publication
    Accès libre
    Atomic level structure of Ge-Sb-S glasses : chemical short range order and long Sb-S bonds
    (Elsevier Science, 2018-09-28) Pethes, Ildikó; Ari, Julien; Nazabal, Virginie; Messaddeq, Younès; Kaban, Ivan; Darpentigny, Jacques; Welter, Edmund; Gutowski, Olof; Bureau, Bruno; Jóvári, Pál
    The structure of Ge20Sb10S70, Ge23Sb12S65 and Ge26Sb13S61 glasses was investigated by neutron diffraction (ND), X-ray diffraction (XRD), extended X-ray absorption fine structure (EXAFS) measurements at the Ge and Sb K-edges as well as Raman scattering. For each composition, large scale structural models were obtained by fitting simultaneously diffraction and EXAFS data sets in the framework of the reverse Monte Carlo (RMC) simulation technique. Ge and S atoms have 4 and 2 nearest neighbors, respectively. The structure of these glasses can be described by the chemically ordered network model: Ge-S and Sb-S bonds are always preferred. These two bond types adequately describe the structure of the stoichiometric glass while S-S bonds can also be found in the S-rich composition. Raman scattering data show the presence of Ge-Ge, Ge-Sb and Sb-Sb bonds in the S-deficient glass but only Ge-Sb bonds are needed to fit diffraction and EXAFS datasets. A significant part of the Sb-S pairs has 0.3–0.4 Å longer bond distance than the usually accepted covalent bond length (∼2.45 Å). From this observation it was inferred that a part of Sb atoms have more than 3 S neighbors.