Abstract
We investigate by femtosecond pump and probe measurements the non-linear optical response in thin films of poly(4,4′-dipentoxy-2,2′-bithiophene) and poly(4,4″-dipentoxy-2,2′:5′,2″-terthiophene), characterized by a high degree of structural regioregularity. These polymers show a fast and high third-order non-linearity. The effects of removing electrons from the polymer chain in a controlled way by electrochemical doping have also been studied. Finally a periodic modulation of the optical transmission has been observed on an extended time scale, which is related to the propagation of coherent longitudinal acoustic phonons.
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