Patent ID: 7374844
Filing Date: 2008-05-20
Classification: B82Y,G03F

Abstract:
1. A photomask for exposure to near-field light, said photomask comprising: a light-transmissible base member; and a light-blocking film provided on the base member, said film having a micro-aperture adapted to expose an object to near-field light seeping out from the micro-aperture, said photomask having a periodic structure comprising said micro-aperture at an axis of symmetry and recesses or projections with a pitch, and a shift of a phase, wherein the shift of the phase exists between said recesses or projections adjacent to the micro-aperture, and wherein intensity distribution of the near-field light is controlled by way of the pitch and an extent of the shift of the phase of the periodic structure so that a difference in the intensity distribution of the near-field light in the area of the aperture is reduced.