Abstract
We report measurements of the third-order susceptibilities and two-photon absorption in branched oligothienylenevinylenes derivatives C 42H 62S 2, C 114H 174S 6, C 252H 366N 3O 6P 3S 12, using degenerate four wave mixing (DFWM) technique at λ=532 nm in picosecond regime. All the studied compounds show large third-order nonlinear optical properties with comparison with known materials such as, polydiacetylene, octupolar molecules and their dipolar subunits. We show the influence of the number of branches on the benzene cycle. We demonstrate that the values of third-order susceptibilities χ 〈3〉 and two-photon absorption coefficients β increase as the number of branches increase. As consequence the studied complexes can be very interesting for optical limiting applications.
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