what is photolithography
For the same process applied to metal, see Photochemical machining. Photolithography, also termed optical lithography or UV lithography, is a process used in microfabrication to pattern parts of a thin film or the bulk of a substrate.It uses light to transfer a geometric pattern from a photomask to a light-sensitive chemical  photoresist , or simply resist, on the substrate.or the same process applied to metal, see Photochemical machining. Photolithography, also termed optical lithography or UV lithography, is a process used in microfabrication to pattern parts of a thin film or the bulk of a substrate.