Abstract
Abstract The promise of conducting polymers as fast response nonlinear optical materials has been recently ernphaized1-3. Polymers such as polyacetylene, polythiophene and the soluble (and processible) poly(3alkylthienylenes) contain a high density of welectrons, and they are known to exhibit photoinduced absorption and photoinduced bleaching, indicating major shifts of oscillator strength upon photoexcitation2-4. For polyacetylene, these nonlinear effects have been studied in detail in the picosecond5a-b and subpicosecond5c time regime and correlated with the photoproduction of charge carriers through fast photoconductivity measuremenkm6. The data have demonstrated ul-tra-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 photoexcitations7 which characterize this class of polymers: solitons, polarons and bipolarons4.
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