ELECTROOPTIC COEFFICIENT DETERMINATION IN STRATIFIED ORGANIZED MOLECULAR THIN-FILMS - APPLICATION TO POLED POLYMERS

We describe a method which enables us to determine the linear and quad ratic electro-optic coefficients (real and imaginary parts) of thin st ratified films even inside the absorption range. The principle is base d on the interferences between the electric-field-induced modulation o f the transverse electric and transverse magnetic reflected waves. Exp eriments performed on a poled polymer yield microscopic parameters suc h as the excited and fundamental state permanent moments and the diffe rence and transition moments which are in a very good agreement with o ther determinations. The presence of an excited state not detected by linear spectroscopy was revealed.