Light emission properties of crystalline SiO2 coated with LiNbO3/LiTaO3 multilayers

Authors
Citation
Xl. Wu et Gg. Siu, Light emission properties of crystalline SiO2 coated with LiNbO3/LiTaO3 multilayers, APPL PHYS L, 74(22), 1999, pp. 3278-3280
Citations number
21
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
APPLIED PHYSICS LETTERS
ISSN journal
0003-6951 → ACNP
Volume
74
Issue
22
Year of publication
1999
Pages
3278 - 3280
Database
ISI
SICI code
0003-6951(19990531)74:22<3278:LEPOCS>2.0.ZU;2-4
Abstract
Photoluminescence (PL) properties of the crystalline SiO2 coated with LiNbO 3/LiTaO3 multilayers were studied using the 514.5 nm line excitation. The 2 .25 eV PL band observed at room temperature can be Gaussian divided into tw o subbands at 2.19 and 2.30 eV, which can be clearly resolved in the 77 K P L spectrum. The 2.30 eV band is z polarized with a polarization degree of 0 .25 and its intensity has a linear dependence on the excitation power. No s imilar behavior was observed for the 2.19 eV band. Spectral analysis indica tes that the two PL bands arise from optical transitions of the self-trappe d excitons and E' defect pairs in the crystalline SiO2 surface, which are i nduced by the photorefractive effect of the coated multilayers. (C) 1999 Am erican Institute of Physics. [S0003-6951(99)00422-2].