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Título : Structural origin of the nonlinear optical properties of lead niobium germanate film glasses
Autor : Muñoz-Martín, David, Ruiz de la Cruz, A., Fernández Navarro, José María, Domingo, Concepción, Solís Céspedes, Javier, Gonzalo de los Reyes, José
Fecha de publicación : 2011
Editor: American Institute of Physics
Resumen: The structural origin of the nonlinear optical susceptibility (/Ξ(3)/) of lead-niobium-germanate film glasses with large Nb 2O5 contents has been investigated. /Ξ(3)/ shows a strong enhancement with the Nb content in the films with /Ξ(3)/values close to 2 × 10-11 esu at 800 nm for a Nb content as high as 0.71. Boling-Glass-Owyoung and Lines' semiempirical models predict accurately the values of /Ξ(3)/for transparent bulk glasses but not for film glasses. This discrepancy is related to the remarkable structural differences between them. Raman spectroscopy suggests the formation of a three-dimensional (3D) structure of [NbO6] octahedra in the case of film glasses having large Nb contents, while X-ray photoelectron spectroscopy shows that a significant fraction of these units contain Nb 4+ ions. The combination of a 3D structure of [NbO6] with the presence of Nb4+ polarons and their migration through electron intervalence transfer is proposed as the origin of the observed enhancement of /Ξ(3)/in the film glasses. © 2011 American Institute of Physics.
Identificadores: doi: 10.1063/1.3608172
issn: 0021-8979
Citación : Journal of Applied Physics 110: 023522 (2011)
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