TITLE

Measurement of the photorefractive space-charge field in a ferroelectric mesogen

AUTHOR(S)
Talarico, M.; Termine, R.; Barberio, G.; Pucci, D.; Ghedini, M.; Golemme, A.
PUB. DATE
February 2004
SOURCE
Applied Physics Letters;2/16/2004, Vol. 84 Issue 7, p1034
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We report on the measurement of the photorefractive space-charge field in a chiral smectic C mesophase. The liquid crystal is intrinsically photoconducting and undoped. The space-charge field amplitude, obtained from a model connecting the induced refractive index modulation with the electric fields within the medium, is only 1% of the applied field. Nonetheless, high refractive index modulations Δn∼10[sup -3] can be obtained because of the high spontaneous birefringence of the mesophase. The use of the standard models for inorganic crystalline photorefractive materials would have given a space-charge field amplitude two orders of magnitude higher. © 2004 American Institute of Physics.
ACCESSION #
12202357

 

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