Abstract

The growing interest in all optical switching and high speed optoelectronics has promoted the search for new materials with large nonlinear optical susceptibilities and fast time response. Polymers with long conjugated chains are natural candidates and their electrical and optical properties are gaining considerable interest. In particular polyacetylenes^[1-2] and polydiacetylenes^[3-4] have been extensively investigated using ultrafast spectroscopy. A promising class of organic materials is represented by thiophene-based polymers, which present a ring structure in the repeating unit. The optical properties of these compounds have not yet been fully investigated and a few measurements of excited state relaxation dynamics after photoexcitation have been reported^[4-6].

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