Patent ID: 6985211
Filing Date: 2006-01-10
Classification: B82Y,G02B,G03F,G21K

Abstract:
1. A lithographic apparatus comprising: an illumination system configured to provide a beam of radiation; a support structure configured to support a patterning structure, the patterning structure being configured to endow a beam of radiation with a pattern in its cross-section; a substrate table configured to hold a substrate; and a projection system configured to project the patterned beam onto a target portion of the substrate, wherein an optical path of the beam of radiation includes a reflector provided with (1) a reflecting multilayer stack having a plurality of base periods and (2) at least one additional period covering only part of a surface of the multilayer stack, and wherein said at least one additional period is configured to effect, in a reflected beam and relative to an adjacent portion of said surface, a local change of at least one of the group consisting of phase and intensity, and wherein at least one of said base periods comprises an absorber layer and a spacer layer.