Patent ID: 6285497
Filing Date: 2001-09-04
Classification: G03F,Y10S

Abstract:
A process for fabricating a device comprising at least one element having a dimension of less than or equal to 0.25 micron which comprises the steps of:providing a source of extreme ultra-violet (EUV) radiation;providing a condenser system succeeding the source wherein the condenser system has a set of mirrors for collecting the EUV radiation and transforming the EUV radiation into one or more beams and has correcting mirrors which are capable of translating or rotating, or both, one or more beams from said set of mirrors, wherein at least one of the correcting mirrors, or a mirror that is common to all sets, has a diffraction grating on its surface and wherein the diffraction grating comprises an essentially uniform frequency, phase only reflecting binary optical element that has at least two levels and wherein the condenser system produces substantially parallel arc-shaped light beams that are transmitted to a reflective mask pattern and then reflected therefrom to produce corresponding pattern image regions on the device being fabricated; andconstructing one or more levels in the device being fabricated by removing or adding materials in the pattern image regions on the device being fabricated.