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Optical Engineering

Automated analysis of Fourier images for semiconductor wafer monitoring
Author(s): Michael Lazarus; Rangachar Kasturi; Ramesh C. Jain
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Paper Abstract

A method for automating the analysis of images generated from the Fourier imaging (FI) process is described. Fourier imaging is used to observe the evolving topography of wafers as they are being etched in a reactive ion etcher. The focus of the research described in this paper is the segmentation and analysis of images generated from FI. A brief overview of the theory of FI is presented. Segmentation of a Fourier image is done in three steps; local maxima detection, Fourier component extent identification, and boundary tracking. Quantification descriptions for each component are then generated from the segmented image. The algorithm presented demonstrates how it is possible to obtain subpixel resolution automatically in image analysis to collect data that may be used to compute critical dimensions of the microtopography of the wafer substrate.

Paper Details

Date Published: 1 February 1992
PDF: 9 pages
Opt. Eng. 31(2) doi: 10.1117/12.56077
Published in: Optical Engineering Volume 31, Issue 2
Show Author Affiliations
Michael Lazarus, Univ. of Michigan (United States)
Rangachar Kasturi, The Pennsylvania State Univ. (United States)
Ramesh C. Jain, Univ. of Michigan (United States)

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