Abstract
ABSTRACTThe effect of pendant side groups on two-photon absorption cross-section in a number of soluble fluorescent polythiophenes was investigated. Different side groups lead to different planarity and conformation of the polymer. As the side-group-induced planarity of the polymer chain increases, the two-photon absorption cross-section also increases. The increased delocalization of the π-electrons along the polymer backbone enhances the third-order optical nonlinearity. The aggregation of the polymer chain in solution lowers the quantum efficiency of fluorescence and decreases the two-photon absorption cross-section. This study demonstrates a novel method of enhancing the two-photon absorption cross-section by tuning the pendant side group.
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