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Computed tomography using intersecting views of plasma using optical emission spectroscopy during plasma processing

  • US 10,215,704 B2
  • Filed: 03/02/2017
  • Issued: 02/26/2019
  • Est. Priority Date: 03/02/2017
  • Status: Active Grant
First Claim
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1. A plasma optical emission spectrographic (OES) system comprising:

  • a first array of multiple OES optical detectors configured to have a first line-of-sight view of plasma over a substrate on a substrate holder in an etch chamber of a plasma processing system;

    a second array of multiple OES optical detectors configured to have a second line-of-sight view of plasma in the etch chamber; and

    circuitry configured to generate a computed tomographic reconstruction of chemical species of the plasma based on measurements received from the first array of multiple OES optical detectors and the second array of multiple OES optical detectors,wherein, relative to each other, the first line-of-sight view and second line-of-sight view intersect within the etch chamber and are non-coextensive, non-parallel, and non-orthogonal,wherein the generation of the computed tomographic reconstruction includes;

    obtaining light measurements from light received from intersecting views of the first and second line-of-sight views;

    identifying chemical species in the plasma based on the obtained light measurements;

    determining spatial locations of the identified chemical species in the plasma based on the obtained light measurements;

    associating the determined spatial locations in the plasma for one or more of the identified chemical species;

    storing a tomographic reconstruction based on the association of the determined spatial locations in the plasma with the respective one or more of the identified chemical species.

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