Polar orientation of a pendant anionic chromophore in thick layer-by-layer self-assembled polymeric films

TR Number
Date
2008-09-01
Journal Title
Journal ISSN
Volume Title
Publisher
American Institute of Physics
Abstract

Multilayer films with up to 600 bilayers and 740 nm thickness were fabricated using the alternating deposition of poly(allylamine hydrochloride) and poly{1-[p-(3'-carboxy-4'-hydroxyphenylazo)benzenesulfonamido]-1,2-ethand iyl} on glass substrates. Linear relationships for absorbance, thickness, and the square root of the second harmonic intensity versus the number of bilayers demonstrates that the films have long range polar order and optical homogeneity. The deposition conditions (i.e., pH of the solutions, solvent quality, deposition and rinsing times) are critical variables in fabricating layer-by-layer thick films that exhibit long range polar orientation of chromophores. The ability to fabricate noncentrosymmetric films on the order of a micron thick with bulk second order nonlinear optical responses is crucial because it enables the development of nonlinear optical waveguide devices such as electro-optic modulators. (c) 2008 American Institute of Physics.

Description
Keywords
Thin films, Polycyclic aromatic hydrocarbons, Second harmonic generation, Polymer films, Polymers
Citation
Garg, Akhilesh, Davis, Richey M., Durak, Cemil, Heflin, James R., Gibson, Harry W. (2008). Polar orientation of a pendant anionic chromophore in thick layer-by-layer self-assembled polymeric films. Journal of Applied Physics, 104(5). doi: 10.1063/1.2974094