Micrascan III: 0.25-um resolution step-and-scan system

Abstract
Catadioptric step-and-scan lithography offers specific advantages over step-and-repeat all- refractive (dioptric) systems as resolution requirements drive to 0.25micrometers in volume production. For the Micrascan family of step-and-scan tools this step in the evolutionary path from 0.35micrometers to 0.25micrometers has involved changes to both the projection optics and illumination system.
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