Abstract
In order to further exploit the optical nonlinearities in chalcone derivatives, two bis-chalcone molecules (C1 &C2) are synthesized. The third-order optical nonlinearities of both molecules are investigated via Z-scan. Enhanced nonlinear absorption and refraction are measured in C1 due to its superior planar π-conjugation over C2. Furthermore, an ultrafast sign change in both nonlinear absorption and refraction are revealed in C1 under femtoseconds and picoseconds lasers. A sub-picosecond ultrafast transfer is illustrated via femtoseconds transient absorption spectrum and considered as the mechanism behind the sign change. The results of this research may further extend the potential of chalcone derivatives in nonlinear optical applications and provide another method to tune the optical nonlinearity in such materials.
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