Theoretical investigation of nonlinear optical properties

The push-plull organic materials are attracting a growing interest for their flexibility in synthesis and their technological implementation. The excitement of these materials under the effect of an electric field us allows to easily track the intramolecular charge transfer and distribution of electron cloud in the molecular unit. Different theoretical calculations are exploited to determine the coefficient of first order hyperpolarizabilities ¿. Looking at the parameters which will influence this phenomenon and increasing the values of ¿ in the model of push-pull the organic compounds.