Patent ID: RE41220

Claim:
A projection lithographic method for producing integrated circuits with printed feature dimensions less than 100 nm, said method comprising: providing an illumination sub-system for producing and directing an extreme ultraviolet soft x-ray radiation λ, said illumination sub-system including an extreme ultraviolet soft x-ray source, providing a mask stage and a mask illuminated by said extreme ultraviolet soft x-ray radiation λ produced by said illumination sub-system for forming a projected lithographic pattern when illuminated by said radiation λ, providing a projection sub-system, providing a wafer stage and an integrated circuit wafer, said integrated circuit wafer having a λ radiation sensitive wafer surface, projecting with said projection sub-system the projected lithographic pattern from said mask onto said radiation sensitive wafer surface, said sub-system comprising a plurality of reflective lithography elements, said lithography elements including a plurality of reflective multilayer coated Ti doped high purity SiO 2 glass substrates with defect free glass surfaces for manipulating said radiation and aid lithographic pattern.