In accordance with the invention, features can be directly imprinted into
the surface of a solid substrate. Specifically, a substrate is directly
imprinted with a desired pattern by the steps of providing a mold having
a molding surface to imprint the pattern, disposing the molding surface
adjacent or against the substrate surface to be imprinted, and
irradiating the substrate surface with radiation to soften or liquefy the
surface. The molding surface is pressed into the softened or liquefied
surface to directly imprint the substrate. The substrate can be any one
of a wide variety of solid materials such as semiconductors, metals, or
polymers. In a preferred embodiment the substrate is silicon, the laser
is a UV laser, and the mold is transparent to the UV radiation to permit
irradiation of the silicon workpiece through the transparent mold. Using
this method, applicants have directly imprinted into silicon large area
patterns with sub-10 nanometer resolution in sub-250 nanosecond
processing time. The method can also be used with a flat molding surface
to planarize the substrate.