US Patent 7768628 Contact lithography apparatus and method

A contact lithography apparatus and a method use one or both of spacers and a mesa to facilitate pattern transfer. The apparatus and the method include one or both of a spacer that provides a spaced apart orientation of lithographic elements, such as a patterning tool and a substrate, when in mutual contact with the spacer and a mesa between the patterning tool and the substrate. The mesa supports a contact surface of one or both of the mold and the substrate. One or both of the spacers and the mesa may be non-uniform. One or more of the patterning tool, the substrate and the spacer is deformable, such that deformation thereof facilitates the pattern transfer.