Patent ID: 11908716
Assignee: APPLIED MATERIALS, INC.
Field: Measurement (Instruments)
Classification: CPC H  C  G | IPC C  G  H

Claim 1:
2. The method of claim 1 further comprising:
illuminating the measurement area on the sample disposed in the process chamber using a second input beam having a second peak wavelength different from the first peak wavelength, the second input beam generated remote from the process chamber and transmitted to the objective lens system by the first optical fiber;
receiving portions of the second input beam reflected from the measurement area at the imaging sensor as a second reflected beam, the second reflected beam transmitted from the objective lens system to the imaging sensor by the second optical fiber;
obtaining a sequence of second images of the measurement area using the second reflected beam received at the imaging sensor, each of the second images obtained at a different time within the monitoring period, and each of the images comprising second pixels corresponding to different parts of the measurement area;
determining a second reflectance of one or more of the second pixels within each of the second images, the one or more of the second pixels corresponding to the areas of interest within the measurement area;
determining a second change in the reflectance of the one or more of the second pixels between adjacent second images in the sequence; and
monitoring the etch or deposition process based on the first change in the reflectance and the second change in reflectance.