Systems for inspection of patterned and unpatterned wafers are provided.
One system includes an illumination system configured to illuminate the
specimen. The system also includes a collector configured to collect
light scattered from the specimen. In addition, the system includes a
segmented detector configured to separately detect different portions of
the light such that azimuthal and polar angular information about the
different portions of light is preserved. The detector may also be
configured to produce signals representative of the different portions of
the light. The system may also include a processor configured to detect
defects on the specimen from the signals. In another embodiment, the
system may include a stage that is configured to rotate and translate the
specimen. In one such embodiment, the system may also include an
illumination system configured to scan the specimen in a wide scan path
during rotation and translation of the specimen.