Patent ID: 8227778
Filing Date: 2012-07-24
Classification: B82Y,G03F,G21K,H05G

Abstract:
1. A semiconductor exposure device comprising: an illumination optical system for directing EUV (extreme ultraviolet) light from an EUV light source to a mask; and mirrors included in the illumination optical system, one of the mirrors comprising a multilayered reflecting coating with grooves and being configured for reflecting the EUV light from the EUV light source to direct the EUV light to the mask, the grooves being arranged in a concentric fashion, wherein the EUV light source is configured for irradiating a target with laser light from a driver laser to turn the target into plasma from which the EUV light is emitted, and the grooves are configured for diffracting at least light at a wavelength which is the same as that of the laser light from the drive laser.