Patent ID: 11899380
Assignee: ASML HOLDING N.V.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 9:
10. A method, implemented by a metrology apparatus, for sensing an alignment mark on a substrate, the method comprising:
receiving, at a sensor comprising a self-referencing interferometer having a field of view at the substrate larger than the alignment mark, light diffracted by the alignment mark;
generating an output comprising at least one standing output image of the alignment mark as the alignment mark is scanned;
detecting, at a detector, a phase signal in the output;
capturing, at a camera, an image of the output;
receiving, at an optical device, the output;
conveying the output to the detector and the camera;
receiving, at a processor, data from the camera; and
performing image manipulation on the data, the image manipulation comprising setting a digital aperture that is one of an arbitrary shape, modulated, or apodized.