Patent ID: 6815693
Filing Date: 2004-11-09
Classification: B82Y,H01J

Abstract:
In a method for making a transfer medium defining a pattern to be transferred lithographically to a sensitive substrate using a charged particle beam passing through a charged-particle-beam (CPB) optical system, a method for correcting proximity effects, comprising:(a) dividing the pattern into multiple subfields to be exposed onto the substrate in respective shots of the charged particle beam, each subfield containing one or more respective elements of the pattern; (b) for selected subfields, determining data concerning beam blur that would be imposed by the CPB optical system exposing the respective subfields, the blur for a selected subfield being a function of beam deflection to expose the subfield and of location of one or more pattern elements within the subfield; (c) storing the data for the selected subfields; and (d) configuring the pattern on a reticle, wherein, for each of the selected subfields, the data is recalled and used in local resizing of the respective elements in the subfields so as to achieve a reduction of proximity effects in the subfield as transferred to the substrate.