Patent ID: 7433056
Filing Date: 2008-10-07
Classification: G01B,G01N

Abstract:
1. A metrology system comprising: a narrowband beam generation system for directing a narrowband probe beam at a measurement pattern on a test sample; a first sensor; a set of output optics for directing inelastically scattered light from the measurement pattern in response to the narrowband probe beam onto the first sensor; and a computing system for performing a scatterometry analysis on inelastically scattered light data measured by the first sensor, wherein the computing system comprises: means for generating a set of trial inelastically scattered light data by applying a trial distribution for a material property of the measurement pattern to a mathematical model of the measurement pattern; means for comparing the set of trial inelastically scattered light data to a set of measured inelastically scattered light data for the measurement pattern measured by the first sensor; means for adjusting the trial distribution until the set of trial inelastically scattered light data matches the set of measured inelastically scattered light data; and means for providing the trial distribution as an output distribution of the material property for the measurement pattern when the set of trial inelastically scattered light data matches the set of measured inelastically scattered light data to within a specified tolerance.