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Second Order Nonlinear Optical Films by Alternating Polyelectrolyte Deposition on Hydrophilic and Hydrophobic Substrates

Published online by Cambridge University Press:  21 March 2011

M. Joseph Roberts
Affiliation:
Naval Air Warfare Center Weapons Division, Polymer Science and Engineering Branch China Lake, CA 93555-6100
Warren N. Herman
Affiliation:
Naval Air Warfare Center Aircraft Division, Electro-Optic Sensors Branch Patuxent River, MD
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Abstract

Alternating polyelectrolyte deposition (APD) is a room temperature process that can be used to produce noncentrosymmetric ordered films of nonlinear optical polymers (NLOP). In this study, second-order NLOP APD films of a stilbazolium-substituted polyepichlorohydrin, poly (diallyldimethylammonium chloride), and polyacrylic acid were prepared by alternately dipping a substrate into aqueous solutions of each polymer. Evidence for uniform layer to layer deposition includes a linear increase of UV-Visible absorbance, thickness measurements, and quadratic increase of second harmonic generated light intensity as a function of film thickness. Films have been uniformly deposited up to 0.1 micrometer thick. The surface morphology, roughness, and film thickness have been characterized by Tapping Mode Atomic Force Microscopy (TM AFM ). Work is in progress to deposit thicker films of the same quality and to improve NLO figures of merit.

Type
Research Article
Copyright
Copyright © Materials Research Society 1999

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