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Cubic Nonlinear Optical Properties of Thin Films of a Series of Aromatic Schiff Base Polymers

Published online by Cambridge University Press:  25 February 2011

Chen-Jen Yang ,
Samson A. Jenekhe ,
Herman Vanherzeele  and
Jeffrey S. Meth
Chen-Jen Yang
Affiliation:
Department of Chemical Engineering and Center for Photoinduced Charge Transfer, University of Rochester, Rochester, NY 14627–0166
Samson A. Jenekhe
Affiliation:
Department of Chemical Engineering and Center for Photoinduced Charge Transfer, University of Rochester, Rochester, NY 14627–0166
Herman Vanherzeele
Affiliation:
DuPont Central Research & Development Department, P. O. Box 80356, Wilmington, DE 19880–0356
Jeffrey S. Meth
Affiliation:
DuPont Central Research & Development Department, P. O. Box 80356, Wilmington, DE 19880–0356
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Abstract

The third-order nonlinear optical properties of a series of homopolymers and a random copolymer of conjugated aromatic Schiff base polymers have been investigated by picosecond third harmonic generation spectroscopy in the wavelength range 0.9–2.4 um. The off-resonant χ(3)(-3ω;ω, ω, ω) value at 2.4 μm was found to be 1.6×10−12esu for the parent polymer (PPI). 2, 5-Dimethoxy and 2, 5-dihydroxy substitutions or random colpolymerization was found to enhance the nonresonant optical nonlinearity of PPI by a factor of 1.5–4.5. 2-Methyl substitution lowered the χ(3) value. The three-photon resonance enhanced χ(3) of the polymers was in the range l.l×10−11 to 5.2×l0−11 esu. A three-level essential states model was found to describe the observed χ(3) spectra and the resulting fitting parameters were used to explain the observed trends in structure - χ(3) relationships.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 247: Symposium N – Electrical, Optical, and Magnetic Properties of Organic Solid State Materials , 1992 , 247
Copyright
Copyright © Materials Research Society 1992

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