Patent ID: 11947269
Assignee: ASML NETHERLANDS B.V.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 6:
7. A metrology target for setup, monitoring or correction of a measurement recipe used to determine a patterning process parameter that measures change in a physical configuration of a structure based on a detected representation of radiation redirected by the structure, wherein the structure has geometric symmetry at a nominal physical configuration and wherein a different physical configuration of the structure than the nominal physical configuration causes an asymmetric optical characteristic distribution in the detected representation, the metrology target comprising:
a plurality of target areas, wherein each target area has a target structure that has an intentional different physical configuration of the respective target structure than the respective nominal physical configuration of the respective target structure, wherein each target structure has geometric symmetry at the respective nominal physical configuration, wherein the intentional different physical configuration of the respective target structure causes an asymmetric optical characteristic distribution and wherein each target area is associated with a different type of a certain same patterning process parameter, each patterning process parameter type measuring a respective change in the target structure physical configuration of the associated target structure from the intentional and/or nominal target structure physical configuration and wherein each target structure is configured to enable a value of the respective patterning process parameter type to be determined from that target structure without use of radiation from another of the target structures.