INVESTIGADORES
UREÑA Maria Andrea
congresos y reuniones científicas
Título:
Compositional dependence of the optical properties of chalcogenide glasses thin film of Agx(Ge0.25Se0.75)100-x system
Autor/es:
CONDE GARRIDO, J. M.; PIARRISTEGUY, A.; MARIA ANDREA UREÑA; FONTANA, M.; ARCONDO, B.; PRADEL, A.
Lugar:
Saint Malo
Reunión:
Simposio; XVIII International Symposium on Non-Oxide Glasses and New Optical Glasses (ISNOG 2012); 2012
Institución organizadora:
Universidad de Rennes
Resumen:
Chalcogenide glasses have many
technological applications as a result of their particular optical and
electrical properties. These materials possess remarkable optical properties
such as wide transmission windows (1?20 mm) controlled by composition, large refractive
indexes and interesting photo-induced properties. In this work, the effect of
silver content on the optical properties of films of Agx(Ge0.25Se0.75)100-x chalcogenide glasses has been analyzed. The
films were prepared by pulsed laser deposition from bulk glasses target of
composition Agx(Ge0.25Se0.75)100-x with x ≤ 25 at.% and deposited onto microscope
slides. Morphology, structure and optical properties of the films were
characterized by means of the following techniques: profilometry, scanning
electron microscopy and UV-visible-NIR spectroscopy. The optical constants,
i.e. the refractive index, extinction coefficient, absorption coefficient, and
the optical band gap energy were determined and their compositional dependence
was considered. The refractive index of the films between 500 nm and 2500 nm was
determined from the transmission spectra of the stacked structure
??film-substrate?? using procedures described previously by Swanepoel and
González-Leal [1,2]. The optical band gap was also calculated with Tauc?s law
[3]. It was found that as the Ag content of the alloy increased, the refractive
index increased (for every wavelength) and the optical band gap decreased.