Patent ID: 11966169
Assignee: ASML HOLDING N.V.
Field: nan (nan)
Classification: CPC nan | IPC G  H

Claim 21:
22. A system comprising:
a first phased array comprising:
optical elements configured to radiate radiation waves;
waveguides configured to guide radiation from a radiation source to the optical elements;
phase modulators configured to adjust phases of the radiation waves; and
one or more metal elements, interposed between the waveguides, configured to reduce coupling between optical elements, wherein the first phased array is configured to form a first beam of radiation directed toward a target structure;

a second phased array comprising:
optical elements configured to detect diffracted radiation waves from the target structure;
waveguides configured to guide radiation from the optical elements to a detector;
phase modulators configured to adjust phases of the radiation waves; and
one or more metal elements, interposed between the waveguides, configured to reduce coupling between optical elements;
wherein the detector is configured to generate a measurement signal based on the received radiation, and
wherein the measurement signal is indicative of an alignment characteristic or an overlay characteristic of the target structure.