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Observation Of Photorefractive Effect In A Second Order Nonlinear Optical Chromophore Functionalized Polythiophene Derivative

Published online by Cambridge University Press:  10 February 2011

K. G. Chittibabu
Affiliation:
Center for Advanced Materials, Departments of Chemistry
L. Li
Affiliation:
University of Massachusetts Lowell, Lowell, MA 01854, Molecular Technologies Inc. Westford, MA 01886.
Z. Chen
Affiliation:
Physics
J. Kumar
Affiliation:
Physics
S. K. Tripathy
Affiliation:
Center for Advanced Materials, Departments of Chemistry
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Abstract

We report the observation of photorefractive (PR) effect in a solution processable, thiophene copolymer with a side chain nonlinear optical (NLO) chromophore, poly(3- octylthiophene-co-N-(3-thenyl)-4-amino-2-nitrophenol) [POMDT]. The copolymer exhibits moderately fast photoconductivity. When doped with second order NLO active azo dye, this copolymer exhibited large second order NLO activity, and low asymmetric two beam coupling (TBC) gain. Enhanced TBC gain was observed, when this composite material was plasticized. The observed photorefractive response time is of the order of seconds. The slower response is attributed to the presence of large volume fraction of the plasticizer in the composition, which reduces the charge carrier mobility. The results from photoconductivity, second harmonic generation and two beam coupling experiments are discussed.

Type
Research Article
Copyright
Copyright © Materials Research Society 1996

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Observation Of Photorefractive Effect In A Second Order Nonlinear Optical Chromophore Functionalized Polythiophene Derivative
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