Patent ID: 7462848
Filing Date: 2008-12-09
Classification: B82Y,H01J

Abstract:
1. A lithography tool for patterning resist coated substrates comprising: a charged particle source, configured to produce a charged particle beam; a first lens positioned below said charged particle source, said first lens being configured to form said charged particle beam into a substantially laminar charged particle beam; a stage positioned below said first lens, for carrying said resist coated substrates; a second lens positioned between said first lens and said stage, said second lens being configured to focus said substantially laminar charged particle beam onto the surface of said resist coated substrate; a patterned beam-defining aperture positioned between said first lens and said second lens, said patterned beam-defining aperture being configured to block a large portion of charged particles in said substantially laminar charged particle beam that cannot be focused by said second lens into a predetermined beam profile at the surface of said resist coated substrate; and wherein said electron source, first lens, patterned beam-defining aperture, and second lens are configured (1) to form a non-circular shaped beam at the surface of said resist coated substrate and (2) to map charged particle current passing through multiple separated areas of said beam-defining aperture onto a single area at said resist coated substrate.