Synthesis, properties and host effects of rare-earth doped silica nanopowders for photonic applications

Susan Halpern; George Sigel; Anna Wojcik

doi:10.1117/12.614540

22 August 2005 Synthesis, properties and host effects of rare-earth doped silica nanopowders for photonic applications

Susan Halpern, George Sigel, Anna Wojcik

Proceedings Volume 5925, Nanophotonic Materials and Systems II; 59250B (2005) https://doi.org/10.1117/12.614540
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

In this study, SiO₂/Al₂O₃/Er₂O₃ (SAE) nanopowders were fabricated by the Combustion Flame − Chemical Vapor Condensation (CF-CVC) technique with average primary particle sizes ranging from 10-30 nm. Fluorescence and lifetime measurements were made both on as-prepared powders, as well as heat treated powders, to compare the thermal annealing effects on optical properties. At an annealing temperature of 1000°C, the SAE became partially devitrified with extremely broad (FWHM ≈ 78 nm) and flat emission spectra, which is highly desirable for Wavelength Division Multiplexing (WDM) in optical amplifiers. The unique optical properties of the powders at this temperature, are attributed to the formation of a metastable phase consisting of an uniform nano-scale dispersion of a metastable intermediate SiO₂ (Al,Er)₂O₃ phase in an amorphous SiO₂ matrix. At higher heat treatments (1400°C), a dual-phase equilibrium structure was formed, consisting of a pyrochlore phase in a crystobalite matrix.

Citation Download Citation

Susan Halpern, George Sigel, and Anna Wojcik "Synthesis, properties and host effects of rare-earth doped silica nanopowders for photonic applications", Proc. SPIE 5925, Nanophotonic Materials and Systems II, 59250B (22 August 2005); https://doi.org/10.1117/12.614540

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