Numerical simulation of ellipsometry measurements for determining ratios of nonlinear surface susceptibility tensor components

Numerical experiments are outlined to verify if ratios of the nonlinear surface susceptibility tensor components, that govern second harmonic optical effects in centrosymmetric media, can be unambiguously determined by ellipsometry, using a recently proposed technique. The corresponding theoretical model considers only the effects associated with a single, nonmagnetic interface (between two centrosymmetric media) assumed to be an ideal surface, whose crystallographic point group is either 4mm, 6mm or ∞ m The objective has been to explore how both random and systematic errors in the experimental data related to the state of polarization of the second harmonic radiation influence complex values of the ratios in this case. A procedure used for fitting the sample data is shown to deliver unambiguous results for the unknown ratios thus confirming the applicability and usefulness of the technique.