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Closed Access item Structural and optical properties of tellurite thin film glasses deposited by pulsed laser deposition

Authors:Muñoz-Martín, David
Fernández Navarro, José María
Gonzalo de los Reyes, José
Fierro, Jose L. G.
Domingo, Concepción
García López, J.
Issue Date:2011
Publisher:Elsevier
Citation:Thin Solid Films 520(1): 131-137 (2011)
Abstract:Tellurite (TeO2-TiO2-Nb2O5) thin film glasses have been produced by pulsed laser deposition at room temperature at laser energy densities in the range of 0.8-1.5 J/cm2 and oxygen pressures in the range of 3-11 Pa. The oxygen concentration in the films increases with laser energy density to reach values very close to that of the bulk glass at 1.5 J/cm2, while films prepared at 1.5 J/cm 2 and pressures above 5 Pa show oxygen concentration in excess of 10% comparing to the glass. X-ray photoelectron spectroscopy shows the presence of elementary Te in films deposited at O2 pressures ≤ 5 Pa that is not detected at higher pressures, while analysis of Raman spectra of the samples suggests a progressive substitution of TeO3 trigonal pyramids by TeO4 trigonal bipyramids in the films when increasing their oxygen content. Spectroscopic ellipsometry analysis combined with Cauchy and effective medium modeling demonstrates the influence of these compositional and structural modifications on the optical response of the films. Since the oxygen content determines their optical response through the structural modifications induced in the films, those can be effectively controlled by tuning the deposition conditions, and films having large n (2.08) and reduced k (< 10 - 4) at 1.5 μm have been produced using the optimum deposition conditions. © 2011 Elsevier B.V.
URI:http://hdl.handle.net/10261/59177
Identifiers:doi: 10.1016/j.tsf.2011.06.074
issn: 0040-6090
Appears in Collections:(CFMAC-IO) Artículos
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