Optical measurements of patterned structures
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United States of America Patent
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Apr 29, 2003
Grant Date -
N/A
app pub date -
Oct 26, 2000
filing date -
Oct 28, 1999
priority date (Note) -
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Abstract
A method for measuring at least one desired characteristic of a patterned article is presented. The article is of a kind containing a plurality of different pattern elements located at different sites, each including a stack of layers. An optical model is provided, which is based on a set of parameters corresponding to predetermined characteristics of the article, and is capable of generating theoretical data indicative of spectral response of the article. The set of parameters includes parameters corresponding to geometrical characteristics of the pattern elements. Reference data is prepared containing a plurality of sets of parameters for at least some of the different pattern elements. A spectral measurement of light response is carried out at a selected site of the patterned article and measured data is generated. By varying said parameters' sets, the optical model is optimized, and then the theoretical spectral responses obtained through the optimized optical model and from the measured data is analyzed to determine therefrom the at least one desired characteristic.
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