Abstract

Conjugated molecules are very promising organic materials for nonlinear optics applications. It has been established that the linear and nonlinear properties of this class of molecules scale in a nonlinear way with respect to the π-electron delocalisation length along the conjugated backbone. Some systematic experimental investigations on the length dependence of the molecular optical response of thiophene and phenyl oligomers have been published [1,2]. Thienpont et al. [1] found a saturation of the polarizability α and the second hyperpolarizability γ at about 7 repeat units. We use the term saturation point to denote the transition point where the scaling of the optical properties with the molecular length becomes linear.

© 1993 Optical Society of America