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Type: Artigo de periódico
Title: Optical recording mechanisms in undoped titanosillenite crystals
Author: Jerez, V
de Oliveira, I
Frejlich, J
Abstract: We show that optical recording in undoped photorefractive titanosillenite Bi(12)TiO(20) (BTO) crystals involve electrons, holes and ions, depending on the experimental conditions. Holographic recording and erasure at higher than room temperature was carried out on an undoped crystal sample, showing the presence of a fast photosensitive electron-based hologram and a slower compensating one of nonphotosensitive nature that is responsible for hologram fixing in BTO and is likely to be based on H(+) ions. The fixed grating showed a diffraction eficiency eta approximate to 0.002 and a characteristic activation energy of 0.85 +/- 0.05 eV. A strong light-induced (darkening) photochromic effect was also detected, that had to be accounted on for diffraction efficiency measurement. Holes are shown to participate in the optical recording process when selectively photoexcited with infrared light. (C) 2011 American Institute of Physics. [doi:10.1063/1.3533421]
Country: EUA
Editor: Amer Inst Physics
Rights: aberto
Identifier DOI: 10.1063/1.3533421
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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