Patent ID: 7167242

Claim:
A sample analysis method comprising the steps of: applying polarized light to a sample, in which a dielectric film having a dielectric constant equal to or larger than 50, based on electrical measurement, is formed on a substrate, by an ellipsometer; measuring a value of a difference between a polarization state of incident light and a polarization state of the light reflected from the sample; forming, a model including void volume fraction between 60% and 90%, based on effective medium approximation, setting conditions corresponding to the sample; calculating a value corresponding to the value of a difference in a polarization state measured by the ellipsometer, based on the formed model; comparing the calculated value with the value of difference measured by the ellipsometer; performing calculation using an effective medium approximation formula and a dispersion formula in the model, so that a difference between the compared values becomes minimal; and analyzing the sample based on a result of the calculation.