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Proceedings Paper

Synthesis, properties and host effects of rare-earth doped silica nanopowders for photonic applications
Author(s): Susan Halpern; George Sigel; Anna Wojcik
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Paper 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.

Paper Details

Date Published: 22 August 2005
PDF: 10 pages
Proc. SPIE 5925, Nanophotonic Materials and Systems II, 59250B (22 August 2005); doi: 10.1117/12.614540
Show Author Affiliations
Susan Halpern, Rutgers Univ. (United States)
George Sigel, Rutgers Univ. (United States)
Anna Wojcik, Hybrid Glass Technologies (United States)

Published in SPIE Proceedings Vol. 5925:
Nanophotonic Materials and Systems II
Zeno Gaburro; Stefano Cabrini, Editor(s)

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