Patent ID: 9470639
Filing Date: 2016-10-18
CPC Classification: G01B,G01N,G03F

Claim Text:
1. A metrology system comprising: an illumination source configured to generate an amount of illumination light at a plurality of wavelengths; an illumination optics subsystem configured to direct the amount of illumination light from the illumination source to a periodic metrology target disposed on a specimen under measurement at a plurality of available values of angle of incidence, azimuth angle, polarization state, or any combination thereof; a detector having a planar, two-dimensional surface sensitive to incident light, wherein the detector is configured to generate a plurality of output signals indicative of a response of the specimen to the amount of illumination light; a collection optics subsystem configured to collect an amount of collected light from the specimen and direct the amount of collected light to the surface of the detector; and a computing system configured to: