Patent ID: 9091650
Filing Date: 2015-07-28
Classification: G01B,G01N,G02B,G03F

Abstract:
1. A system for performing optical metrology, comprising: a stage configured to support a sample; at least one illumination source configured to provide illumination along an illumination path; an apodizer disposed within a pupil plane of the illumination path, the apodizer configured to apodize illumination directed along the illumination path; an illumination scanner disposed along the illumination path, the illumination scanner configured to scan a surface of the sample with at least a portion of the apodized illumination; an illumination field stop disposed along the illumination path, the illumination field stop configured to block a portion of illumination directed along the illumination path from scanning the surface of the sample; at least one detector configured to detect a portion of illumination scattered, reflected, or radiated from the surface of the sample along a collection path; a collection field stop disposed along the collection path, the collection field stop configured to block a portion of illumination directed along the collection path from being detected; and a computing system communicatively coupled to the at least one detector, the computing system configured to determine at least one spatial attribute of the sample based upon the detected portion of illumination.