ABSTRACT
Significant enhancements of off diagonal second-harmonic and electro-optic tensor components were observed in poled polymers doped with two-dimensional (2D) charge-transfer (CT) molecules. Poling behavior of second harmonic generation coefficient and linear polarizability tensor components were calculated for carbazole derivatives with both 2D and ID CT character. Taking The authors' efforts have been focused on the development of novel multifunctional nonlinear optical (NLO)-phores suitable for thermally stable poled polymer applications. In searches for multifunctional NLO-phores we have developed various carbazole derivatives which possess both photoconductivity and second-order nonlinear optical response. The advantage of two-dimensional charge-transfer molecules in a poled polymeric system over one-dimensional CT ones is experimentally and theoretically demonstrated for waveguide device applications. Electric-field induced alignment is widely used to break the centrosymmetry in a guest-host, side-chain polymer, or main-chain polymer system. The tensor components of the molecular hyperpolarizability were obtained by the sum-over-states method.
