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Sub-pixel alignment of inspection to design

  • US 9,996,942 B2
  • Filed: 03/17/2016
  • Issued: 06/12/2018
  • Est. Priority Date: 03/19/2015
  • Status: Active Grant
First Claim
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1. A system configured to determine a position of output generated by an inspection subsystem in design data space, comprising:

  • an inspection subsystem comprising at least an energy source and a detector, wherein the energy source is configured to generate energy that is directed to a specimen, wherein the detector is configured to detect energy from the specimen and to generate output responsive to the detected energy, and wherein the output comprises frames of the output; and

    one or more computer subsystems configured for;

    selecting alignment targets for the specimen such that one or more of the alignment targets appear in each of the frames generated by the inspection subsystem for the specimen;

    aligning one or more images for each of the alignment targets to its corresponding portion of a design for the specimen;

    determining an offset between the output and the design for each zone of the output based on results of aligning the one or more images generated for one or more of the alignment targets located therein, wherein each zone comprises one or more of the frames;

    aligning output generated by the inspection subsystem at each position of each of the alignment targets on the specimen to the one or more images for the alignment targets;

    determining, for each alignment target, an additional offset between the output generated at its corresponding position on the specimen and its corresponding one or more images based on results of aligning the output; and

    determining, for each of the frames, design data space positions of output generated by the inspection subsystem at other positions on the specimen located therein based on the offset determined for its corresponding zone, the additional offset determined for each of the alignment targets located therein, and specimen space positions of the output generated at the other positions located therein.

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