Patent ID: 8580479

Claim:
A system effective to form a pattern in a photoresist on a substrate, the system comprising: a substrate; a layer of photoresist on the substrate, wherein the photoresist includes a resin, a photoinitiator effective to generate a first reactant upon the absorption of a first photon and thereafter the absorption of a second photon of a particular wavelength of light from incident light, wherein the first reactant is effective to render the resin soluble or insoluble in a photoresist developer, a photoinhibitor effective to generate a second reactant upon the absorption of at least one photon of the particular wavelength of light from the incident light, wherein the second reactant is effective to inhibit the first reactant; a light source; a mask having a pattern including lines with widths of no more than 40 nm; and a processor arranged in communication with the light source, wherein the processor is effective to control the light source to apply light through the mask and form the pattern in the substrate.