Publicação: Photoexpansion and photobleaching effects in oxysulfide thin films of the GeS2+Ga2O3 system
Carregando...
Data
Orientador
Coorientador
Pós-graduação
Curso de graduação
Título da Revista
ISSN da Revista
Título de Volume
Editor
Elsevier B.V.
Tipo
Artigo
Direito de acesso
Acesso restrito
Resumo
Oxysulfide systems undergo structural transformations upon illumination with laser light of near bandgap energy, as well as chalcogenide materials (glasses and films). In this paper, photoinduced effects such as photoexpansion and photobleaching were observed in GeS2+Ga2O3 (GGSO) films synthesized by electron beam evaporation. A surface expansion of the thin films and a shift to shorter wavelengths of the optical absorption edge were observed as a result of UV laser irradiation (wavelength of 351 nm) and they are dependent on laser power density, exposure time and film composition. These parameters were varied to evaluate and enhance the observed effects. In addition, the irradiated GGSO samples exhibited a decrease in refractive index, measured with a prism-coupling technique, which makes these films suitable candidates for applications as gratings and waveguides in integrated optics. (C) 2011 Elsevier B.V. All rights reserved.
Descrição
Palavras-chave
Oxysulfide, Optical bandgap, Photoexpansion, Photobleaching, Thin films
Idioma
Inglês
Como citar
Physica B-condensed Matter. Amsterdam: Elsevier B.V., v. 406, n. 23, p. 4381-4386, 2011.
