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

Published online by Cambridge University Press:  10 February 2011

M. Joseph Roberts
M. Joseph Roberts*
Affiliation:
United States Department of the Navy, Naval Air Warfare Center Weapons Division, Materials and Chemistry Division, Code 4T4220D, 1 Administration Circle, China Lake, CA 93555
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Abstract

The formation of acentric films using alternating polyelectrolyte deposition (APD) has been achieved on hydrophobic and hydrophilic glass substrates. APD is a layer-by-layer technique for the formation of polymer films by alternately immersing a substrate in aqueous solutions of a polyanion and a polycation. APD provides precise control of the overall film thickness that through automated processing may exceed a thousand layers. In this study, APD films were made of an NLO-active polycation, stilbazolium-substituted polyepichlorohydrin (SPECH), and NLO-inactive polyanions. The peak maximum UV-Visible absorbance in transmission through the films was linear as a function of the number of bilayers. Second harmonic generation (SHG) was used as a tool to indicate acentric order of polarizable sidechain chromophores within the APD films. The SHG exhibited the expected quadratic intensity increase with film thickness.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 561: Symposium F – Organic Nonlinear Optical Materials and Devices , 1999 , 33
Copyright
Copyright © Materials Research Society 1999

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