Patent ID: 11899358
Assignee: CARL ZEISS SMT GMBH
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A method for measuring a photomask for semiconductor lithography, comprising the following steps:
recording an aerial image of at least one region of the photomask to generate a recorded aerial image of the at least one region of the photomask,
defining at least one region of interest of the photomask,
ascertaining structure edges in the at least one region of interest of the photomask based on the recorded aerial image to generate ascertained structure edges of the photomask,
providing desired structures to be produced by the photomask,
adapting the ascertained structure edges in the at least one region of interest of the photomask to the desired structures to be produced by the photomask to generate adapted structure edges of the photomask, in which the ascertained structure edges of the photomask are fitted to the desired structures to be produced by the photomask, and
displacing the adapted structure edges of the photomask by use of the results of a separate registration measurement.