Patent ID: 7588882
Filing Date: 2009-09-15
Classification: G03F

Abstract:
1. Lithographic method for fabricating three-dimensional structures on the micrometric and submicrometric scale, including the operations of: providing a substrate; depositing on the said substrate a first layer of a first polymeric material sensitive to exposure to charged particles or to electromagnetic radiation; depositing, on the first layer of the first material, a layer of a second polymeric material sensitive to exposure to charged particles or to electromagnetic radiation in a different way from the first material, so that the processes of exposure and development of the two materials are mutually incompatible to the extent that the exposure or development of one of the materials does not interfere with the exposure and development of the other material; forming a pattern on the second material by a litho-graphic process, comprising the steps of: depositing, on the patterned layer of the second material and on the uncovered regions of the first layer of the first material, a second layer of the first material; and forming a pattern on the first and second layers of the first material by a litho-graphic process, comprising the steps of: wherein the second material is transparent to the particles or to the electromagnetic radiation to which the first material is sensitive.