Patent ID: 8638419

Claim:
A lithographic apparatus, comprising: a projection system configured to project a patterned beam of radiation onto a radiation-sensitive substrate, the projection system comprising a final optical element adjacent the substrate; a liquid supply system configured to provide a liquid to a space between the projection system and the substrate, the liquid supply system comprising a liquid confinement structure configured to at least partly confine the liquid in the space between the projection system and the substrate such that the liquid is in direct contact with the projection system and the liquid confinement structure, the liquid confinement structure having an aperture between the final optical element and the substrate to allow passage of the beam of radiation through the liquid to an exposure field of the substrate; and a stage movable with respect to the liquid confinement structure, the stage having a width wider than a width of the aperture and the stage having a cleaning device configured to clean a surface of the final optical element, of the liquid confinement structure, or of both the projection system and the liquid confinement structure.