Patent ID: 6569574
Filing Date: 2003-05-27
Classification: G03F

Abstract:
A method of patterning radiation comprising:forming a structure and at least one subresolution assist feature over a substrate, the substrate having a first thickness and the subresolution assist feature having a second thickness; the ratio of the first thickness to the second thickness defining a change in phase of radiation passing through the substrate and subresolution assist feature relative to radiation passing through the substrate and structure; said change in phase being about an integer multiple of 360Â°; and simultaneously passing the radiation through the structure and the at least one subresolution assist feature proximate the structure; the structure defining a pattern of radiation intensity; the at least one subresolution assist feature comprising a material that is partially transmissive of the radiation and altering the pattern of radiation intensity relative to a pattern of radiation intensity that would be defined by the structure in the absence of the subresolution assist feature.