Abstract
Optical quality films of the amphiphillic, regioregular polymer PTHPUDT were fabricated via the Langmuir−Blodgett technique, and their third-order nonlinear optical response was investigated using z-scan methods. Analysis of the resulting z-scan data yielded values of = −1.2 × 10-9 esu and = −3.5 × 10-11 esu, consistent with previous studies on polythiophene-based polymers systems. However, even with relatively low intensities incident on pristine PTHPUDT polymer films, the required power to achieve a nonlinear response in the film is sufficient to produce photoinduced changes in the original polymer. These photoinduced changes are consistent with the onset of photooxidation, photobleaching, and chain scission processes. At higher incident intensities, prolonged exposure of the film results in the removal or partial removal of the polymer from the irradiated region. This leads to linear optical effects that manifest themselves as z-scan traces that show pronounced asymmetry and intensity-independent peak-...
Published Version
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