NDLI: Photorefractive effect in an azobenzene chromophore side groups polymer

Content Provider	Springer Nature Link
Author	Fang, Hua Li, Mingtian
Copyright Year	2014
Abstract	We have analyzed the photorefractive (PR) effect of a polymer composite was reported which combines a novel bi-functional poly(N-vinyl)-3-[p-nitrophenylazo]carbazolyl (PVNPAK) and 2,4,7-trinitro-9-fluorenone (TNF). PVNPAK was synthesized by a post-azo-coupling reaction, with an azo derivative as the electrooptic chromophore and carbazolyl as photoconductive moiety. The asymmetric two-beam coupling gain of 13.9 cm$^{−1}$ and diffraction efficiency of 1.2% for poled polymer film fabricated using a corona poling are obtained at the wavelength of 647.1 nm, confirming photorefractivity. We interpreted this result as the orientational enhancement, in which the spatial charge field may enhance the modulated orientation of the azobenzen chromophore. It is unexpected that the photorefractive gain of 9.5 cm$^{−1}$ for the unpoled polymer film also was observed without external field in two-beam coupling (TBC) experiment. This phenomenon is attributed to a light-induced orientational grating when the azobenzene groups are illuminated by polarized light.
Starting Page	1290
Ending Page	1293
Page Count	4
File Format	PDF
ISSN	10002413
Journal	Journal of Wuhan University of Technology-Mater. Sci. Ed.
Volume Number	29
Issue Number	6
e-ISSN	19930437
Language	English
Publisher	Wuhan University of Technology
Publisher Date	2014-12-18
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	photorefractive (PR) effect poly(N-vinyl)-3-[p-nitrophenylazo]carbazolyl orientational enhancement Materials Science
Content Type	Text
Resource Type	Article
Subject	Materials Science

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