Patent ID: 7791708
Filing Date: 2010-09-07
Classification: G03F,H01L

Abstract:
1. A lithographic apparatus comprising: an illumination system constructed and arranged to condition a radiation beam; a support constructed and arranged to support a patterning device, the patterning device being capable of imparting the radiation beam with a pattern in its cross-section to form a patterned radiation beam; a substrate table constructed and arranged to hold a substrate; and a projection system constructed and arranged to project the patterned radiation beam onto a target portion of the substrate, the substrate table comprising a chuck having a plurality of protrusions constructed and arranged to support corresponding parts of a bottom surface of the substrate, wherein a top surface of at least one of the protrusions comprises a plurality of elements that define a reduced contact area between the bottom surface of the substrate and the top surface of the protrusion, and wherein at least one of the elements comprises micro elements on a surface of the at least one of the elements facing the bottom surface of the substrate.