Patent ID: 8004657
Filing Date: 2011-08-23
Classification: B82Y,G03F,G21K

Abstract:
1. An exposure apparatus that comprises a chamber, in which a projection optical system that includes an optical element having a capping layer is arranged, the apparatus exposing a substrate to EUV light via the optical element, the apparatus comprising: a supply unit configured to supply a material into the chamber; and a providing unit configured to provide the EUV light to the capping layer, the providing unit including an aperture configured to be moved onto a path of the EUV light from outside of the path and to be moved, on the path, so that the capping layer is scanned with the EUV light, the providing unit including a sensor configured to be moved with the aperture to measure a reflectance at each position of the capping layer, wherein the apparatus is configured so that the EUV light provided by the providing unit via the aperture causes a photochemical reaction of the material, to grow a layer on the capping layer, with at least one of a condition of supply of the material by the supply unit and a condition of provision of the EUV light by the providing unit being changed with respect to each position of the capping layer based on the measured reflectance at each position of the capping layer, so as to repair the capping layer.