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OPTICAL METROLOGY WITH MULTIPLE ANGLES OF INCIDENCE AND/OR AZIMUTH ANGLES
OPTICAL METROLOGY WITH MULTIPLE ANGLES OF INCIDENCE AND/OR AZIMUTH ANGLES
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机译:具有多个入射角和/或方位角的光学计量学
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摘要
An optical metrology device simultaneously detects light with multiple angles of incidence (AOI) and/or multiple azimuth angles to determine at least one parameter of a sample. The metrology device focuses light on the sample using an optical system with a large numerical aperture, e.g., 0.2 to 0.9. Multiple channels having multiple AOIs and/or multiple azimuth angles are selected simultaneously by passing light reflected from the sample through a plurality of pupils in a pupil plate. Beamlets produced by the plurality of pupils are detected, e.g., with one or more spectrophotometers, to produce data for the multiple AOIs and/or multiple azimuth angles. The data for multiple AOI and/or multiple azimuth angles may then be processed to determine at least one parameter of the sample, such as profile parameters or overlay error.
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