Interactions of Sigma Conjugated Polymers with Strong Optical Fields
The polysilanes (RR’Si)n are a new class of sigma-conjugated linear-chain polymers that have strong absorption and fluorescence in the near ultraviolet and potential for non-linear optical applications. (See ref. 1 for a review.) A description of the optical excitations as delocalized excitons whose coherent spatial extent and whose incoherent energy transfer properties are controlled by the static disorder of the medium, is presented elsewhere in this volume.2 In this work we extend these conclusions by examining the behaviour of the polymer under intense laser irradiation. The experiments reviewed here are of two types, those that use non-resonant light (conventional nonlinear responses) and those that use resonant light (excited state absorption). The polymers are studied at room temperature in thin film and solution.
KeywordsTransient Absorption Excited State Absorption Transient Absorption Spectrum Intense Laser Irradiation Delocalized Exciton
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