Patent ID: 7132225

Claim:
A method of inspecting a lithography template from a substrate having first and second opposed sides and formed from a first material, said method comprising: forming, on said first opposed side, a second material; patterning said second material, defining a patterned layer having a plurality of gaps therein, exposing portions of the substrate, with adjacent gaps being separated by islands of said second material, with said islands having a thickness associated therewith; and producing inspection radiation having information concerning said islands and said portions by impinging incident radiation upon said substrate, said islands having a first response to said incident radiation and said portions have a second response to said incident radiation, differing from said first response, with said incident radiation having a wavelength associated therewith, with said thickness and said wavelength selected to enhance differentiation between information in said inspection radiation concerning said islands from information contained in said inspection radiation concerning said portions, said thickness being approximately ½ of said wavelength of said radiation.