Structural properties of erbium-activated silica-titania glasses: modeling by molecular dynamics method

Stephane Chaussedent; Christope Bernard; Andre Monteil; Nathalie Balu; Jacques Obriot; Sabina Ronchin; Cristiana Tosello; Maurizio Ferrari

doi:10.1117/12.382864

13 April 2000 Structural properties of erbium-activated silica-titania glasses: modeling by molecular dynamics method

Stephane Chaussedent, Christope Bernard, Andre Monteil, Nathalie Balu, Jacques Obriot, Sabina Ronchin, Cristiana Tosello, Maurizio Ferrari

Author Affiliations +

Proceedings Volume 3942, Rare-Earth-Doped Materials and Devices IV; (2000) https://doi.org/10.1117/12.382864
Event: Symposium on Integrated Optoelectronics, 2000, San Jose, CA, United States

Abstract

Here, we use molecular dynamics simulation to reconstruct a silica-titania glass with a Ti/Si atomic ratio of 8.5% activated by 0.7 at% of erbium. These quantities are chosen because they give both refractive index and optically ions concentration suitable for applications. We use a modified Born-Mayer-Huggins potential taking into account a three- body interaction. The distribution of TiO₄ and SiO₄ units as well as the bridging to non-bridging oxygen ratios are evaluated. The local environment of rare-earth ions is also analyzed. In particular, the clustering of erbium is discussed. From the simulated structure, the crystal-field strength is computed and discussed according to the Er³⁺ local environment. Finally, results are compared with information obtained by Raman and photoluminescence spectra.

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Stephane Chaussedent, Christope Bernard, Andre Monteil, Nathalie Balu, Jacques Obriot, Sabina Ronchin, Cristiana Tosello, and Maurizio Ferrari "Structural properties of erbium-activated silica-titania glasses: modeling by molecular dynamics method", Proc. SPIE 3942, Rare-Earth-Doped Materials and Devices IV, (13 April 2000); https://doi.org/10.1117/12.382864

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