Patent ID: 6410213
Filing Date: 2002-06-25
Classification: G03F,Y10S

Abstract:
A method for fabricating an optical microstructure on a substrate comprising the steps of:coating the substrate with a photosensitive material to produce a photosensitive material coating to a height exceeding 15 &mgr;m; producing a surface-relief microstructure pattern on the photosensitive material coating by a single-step exposure of the photosensitive material coating with a scanning beam of electromagnetic radiation, wherein said scanning beam is focused onto a portion of the photosensitive material where said pattern is to be formed, and said beam is multiply translated across said portion while changing its intensity with an optical modulator to provide a scanning beam having an exposure dosage varying with said translations over the photosensitive material coating to produce an optical microstructure pattern as a result of the photosensitive material coating responding to the electromagnetic radiation, wherein a width of said focused beam is smaller than a width of said pattern, and developing said exposed pattern in said photosensitive material to form an optical microstructure.