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Third-Order Nonlinear Optical Properties of a Series of Systematically Designed Conjugated Rigid-Rod Polyquinolines

Published online by Cambridge University Press:  25 February 2011

Ashwini K. Agrawal
Affiliation:
Department of Chemical Engineering and Center of Photoinduced Charge Transfer, University of Rochester, Rochester, N.Y. 14627–0166.
Samson A. Jenekhe
Affiliation:
Department of Chemical Engineering and Center of Photoinduced Charge Transfer, University of Rochester, Rochester, N.Y. 14627–0166.
Herman Vanherzeele
Affiliation:
Du Pont Central Research and Development Department, Wilmington, DE 19880–0356.
Jeffrey S. Meth
Affiliation:
Du Pont Central Research and Development Department, Wilmington, DE 19880–0356.
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Abstract

The third-order nonlinear optical properties of thin films of two series of conjugated rigid-rod polyquinolines, exemplified by poly(2, 2'-(l, 4-phenylene)-6, 6'-bis(4-phenyl quinoline)) (PPPQ, 2d) and poly(2, 7-(l, 4-phenylene)-4, 9-diphenyl-l, 6-anthrazoline) (PPDA, 3d), were investigated by third harmonic generation spectroscopy. Of the nine polyquinolines with diverse backbone structures, PPPQ has the largest optical nonlinearity with a χ(3) (-3ω; ω, ω, ω) value of 3.2 × 10−12 esu and 3.3 × 10−11 esu in the off-resonant and three-photon resonant regions, respectively. A comparison of the nonresonant χ(3) of the series of nine systematically derived polyquinolines showed that a scaling law of the form χ(3) ∼ (λmax)v ∼ Eg -v does not hold; in fact, the nonresonant χ(3) was essentially independent of the optical bandgap. These results suggest that structure-χ(3) propeny relationships in polymers cannot be inferred from those of oligomers and model compounds.

Type
Research Article
Copyright
Copyright © Materials Research Society 1992

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References

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