Patent ID: 7960703
Filing Date: 2011-06-14
Classification: B82Y,H01J

Abstract:
1. A charged-particle beam lithography apparatus comprising: a projection system which projects a charged-particle beam, and images a pattern on a substrate with the projected charged-particle beam, wherein: (i) the projection system comprises a symmetrical magnetic doublet lens configured to generate a magnetic field, and an electro-static lens configured to generate an electrical field superimposed on the magnetic field, (ii) the electro-static lens includes first to third cylindrical electrodes, the first cylindrical electrode being disposed between an object plane and a pupil plane of the symmetrical magnetic doublet lens, the third cylindrical electrode being disposed between the pupil plane and an image plane of the symmetrical magnetic doublet lens, and the second cylindrical electrode being disposed between the first cylindrical electrode and the third cylindrical electrode, and (iii) a potential substantially equal to a potential of the substrate is applied to the first cylindrical electrode and to the third cylindrical electrode, and a potential for accelerating a charged-particle beam that is incident toward the pupil plane and for decelerating a charged-particle beam that exits from the pupil plane is applied to the second cylindrical electrode.