Stable photorefractive memory effect in sol-gel materials
作者:
B. Darracq,
M. Canva,
F. Chaput,
J.-P. Boilot,
D. Riehl,
Y. Le´vy,
A. Brun,
期刊:
Applied Physics Letters
(AIP Available online 1997)
卷期:
Volume 70,
issue 3
页码: 292-294
ISSN:0003-6951
年代: 1997
DOI:10.1063/1.118396
出版商: AIP
数据来源: AIP
摘要:
We report on the synthesis and the optical characterization of a photorefractive sol-gel material which contains nonlinear azo chromophore and carbazole charge transporting molecules. Both of these functional groups are covalently attached to the silica based backbone. Thin sol-gel films exhibit stable optically nonlinear properties: the electro-optic coefficientr13measured at 633 nm is found to be 17 pm/V one day after corona poling and 15 pm/V after three weeks and over a period of several months. Photorefractivity is demonstrated by two beam coupling experiments without external applied electric field. Sol-gel films present a stable photorefractive memory effect with a net internal gain of 200cm−1. ©1997 American Institute of Physics.
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