Photorefractive grating fixing inKNbO3by ferroelectric domains
作者:
R. S. Cudney,
P. Bernasconi,
M. Zgonik,
J. Fousek,
P. Gu¨nter,
期刊:
Applied Physics Letters
(AIP Available online 1997)
卷期:
Volume 70,
issue 11
页码: 1339-1341
ISSN:0003-6951
年代: 1997
DOI:10.1063/1.118573
出版商: AIP
数据来源: AIP
摘要:
We report observations of photorefractive grating fixing in potassium niobate at room temperature by means of ferroelectric domains. A grating is recorded while the crystal is simultaneously depoled. By repoling the crystal, the presence of a latent grating is revealed. This fixed grating diffracts light with an efficiency which increases when an electric field is subsequently applied and when it is uniformly illuminated. We explain these observations qualitatively using a previously developed model that involves charge compensation by domain walls, and a new aspect that invokes the creation of new trap sites at the ferroelectric domain walls. ©1997 American Institute of Physics.
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