Patent ID: 8943443
Filing Date: 2015-01-27
Classification: G03F

Abstract:
1. A photomask comprising: a substrate and one or more features formed on the substrate, wherein the one or more features include two or more of a line, a step and an optically transparent portion, wherein the features are characterized by two or more measured dimensions that have been traceably measured to one or more internationally recognized standards within a known uncertainty, wherein the two or more dimensions include two or more of a width of the line, a height of the step and an optical transmission coefficient of the transparent portion, wherein a viewing surface of the calibration standard comprises a cross-sectional surface of the calibration standard, and wherein the cross-sectional surface is substantially perpendicular or substantially non-perpendicular to an upper surface of one or more of the substrates such that a lateral dimensional artifact of the calibration standard comprises the traceably measured thickness of one or more of the layers.