Patent ID: 9115987
Filing Date: 2015-08-25
Classification: G01B,G01N,G03F

Abstract:
1. An optical metrology device comprising: a light source that produces a beam of light; an optical system that focuses the beam of light into a spot on a sample, the optical system having a numerical aperture ranging from 0.2 to a pupil plate having a plurality of pupils all of which simultaneously receive the beam of light after interacting with the sample, wherein a portion of the beam of light passes through each of the plurality of pupils as a beamlet, the plurality of pupils being arranged to produce beamlets at a plurality of at least one of angles of incidence and azimuth angles; at least one detector positioned to receive the beamlets; and a processor coupled to receive data from the at least one detector for the plurality of at least one of angles of incidence and azimuth angles, the processor configured to determine at least one parameter of the sample based on the data for the plurality of at least one of angles of incidence and azimuth angles.