Interferometry method for ellipsometry, reflectometry, and scatterometry measurements, including characterization of thin film structures

uspto.gov Nov 21 2006 NDE/NDT , Patents

A method including: imaging test light emerging from a test object over a range of angles to interfere with reference light on a detector, wherein the test and reference light are derived from a common source; for each of the angles, simultaneously varying an optical path length difference from the source to the detector between interfering portions of the test and reference light at a rate that depends on the angle at which the test light emerges from the test object; and determining an angle-dependence of an optical property of the test object based on the interference between the test ...

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