Patent ID: 8179530

Claim:
A system configured to determine at least two properties of a specimen during use, comprising: a stage configured to support the specimen during use; a measurement device coupled to the stage, wherein the measurement device is configured as a spectroscopic scatterometer and a spectroscopic ellipsometer, and wherein the measurement device comprises: an illumination system configured to direct energy toward a surface of the specimen during use; and a detection system coupled to the illumination system and configured to detect energy propagating from the surface of the specimen during use, wherein the measurement device is further configured to generate one or more output signals in response to the detected energy during use; and a processor coupled to the measurement device and configured to determine a first property and a second property of the specimen from the one or more output signals during use, wherein the specimen comprises at least one diffracting structure and one or more films underneath the at least one diffracting structure, wherein the first property comprises a grating shape parameter of the at least one diffracting structure, and wherein the second property comprises overlay misregistration of the specimen.