Patent ID: 7369235

Claim:
A spectroscopic ellipsometry system comprising: a near infra-red (NIR) beam generator for generating a NIR probe beam; focusing optics for directing the NIR probe beam at a test sample; a first array-based detector that measures a first range of NIR wavelengths; a second array-based detector that measures a second range of NIR wavelengths; output optics for directing an output beam reflected from the test sample in response to the NIR probe beam onto the first and second detectors; and an analysis system for generating measurement results from data measured by the first and second detectors by modeling structures on the test sample as a layer of homogenous material, the analysis system including: means for adjusting a thickness and an index of refraction for the layer of homogenous material until model results provided by the layer of homogenous material match the data measured; and means for determining the measurement results for the test sample based on the thickness and the index of refraction for the layer of homogenous material.