Ciencia y Tecnologías Físicas >
Centro de Física Miguel A. Catalán - Instituto de Óptica (CFMAC-IO) >
(CFMAC-IO) Artículos >
Open Access item Structural origin of the nonlinear optical properties of lead niobium germanate film glasses
Ruiz de la Cruz, A.
Fernández Navarro, José María
Solís Céspedes, Javier
Gonzalo de los Reyes, José
|Publisher:||American Institute of Physics|
|Citation:||Journal of Applied Physics 110: 023522 (2011)|
|Abstract:||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.|
|Appears in Collections:||(CFMAC-IO) Artículos|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.