Patent ID: 7193709

Claim:
A method of fabricating a sample comprising a sequence of high and low “K” dielectric constant layers of materials which each have thickness on the order of less than 100 Angstroms, said method incorporating a procedure comprising steps a–e, said steps a–e being: a) while fabricating a reference sample which comprises a sequence of high and low “K” dielectric constant layers practicing step b; b) obtaining spectroscopic data therefrom as said reference sample is fabricated; c) while fabricating a second sample which is meant to be the same as the reference sample practicing steps d and e; d) obtaining spectroscopic data therefrom as said second sample is fabricated and in real time detecting differences in said spectra as compared to the corresponding reference sample spectroscopic data; and e) modifying fabrication parameters to minimize said differences; f) practicing said procedure in steps a–e to fabricate a second sample which is substantially identical to said fabricated reference sample in which the spectroscopic data for each of the two samples is derived from ellipsometric PSI and/or DELTA vs. wavelength, and comprises a difference in at least one selection from the group consisting of: N=Cos(2Ψ); C=Sin(2Ψ)Cos(Δ); S=Sin(2Ψ)Sin(Δ); calculated for each of the two samples; said method being further distinguished in that the electromagnetic radiation comprises wavelengths in at least selection from the group consisting of: FIR; IR; NIR-VIS-UV; UV; DUV; and VUV.