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Third Order Nonlinear Optical Susceptibility of Trans-(CH)x: A Degenerate Ground State Conjugated Polymer

Published online by Cambridge University Press:  25 February 2011

M. Sinclair ,
D. Moses ,
K. Akagi  and
A. J. Heeger
M. Sinclair
Affiliation:
Department of Physics and Institute for Polymers and Organic Solids, University of California, Santa Barbara, CA 93106
D. Moses
Affiliation:
Department of Physics and Institute for Polymers and Organic Solids, University of California, Santa Barbara, CA 93106
K. Akagi
Affiliation:
Department of Physics and Institute for Polymers and Organic Solids, University of California, Santa Barbara, CA 93106
A. J. Heeger
Affiliation:
Department of Physics and Institute for Polymers and Organic Solids, University of California, Santa Barbara, CA 93106
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Abstract

The promise of conducting polymers as fast response nonlinear optical materials has been recently emphasized [1,3]. Polymers such as polyacetylene, polythiophene and the soluble (and processible) poly(3-alkylthienylenes) contain a high density of x-electrons, and they are known to exhibit photoinduced absorption and photoinduced bleaching, indicating major shifts of oscillator strength upon photoexcitation [2,4]. For polyacetylene, these nonlinear effects have been studied in detail in the picosecond [5a,b] and sub-picosecond [5c] time regime and correlated with the photoproduction of charge carriers through fast photoconductivity measurements [6]. The data have demonstrated ultra-fast response with nonlinear shifts in oscillator strength occurring at times of the order of 10-13 seconds. These resonant nonlinear optical properties are intrinsic; they originate from the nonlinearity of the self-localized photoexcitations [7] which characterize this class of polymers: solitons, polarons and bipolarons [4].

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 109: Symposium K – Nonlinear Optical Properties of Polymers , 1987 , 205
Copyright
Copyright © Materials Research Society 1988

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References

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