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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 23, Iss. 4 — Feb. 15, 1984
  • pp: 628–632

Interferometric method for checking the mask alignment precision in the lithographic process

G. Makosch and F. J. Schoenes  »View Author Affiliations


Applied Optics, Vol. 23, Issue 4, pp. 628-632 (1984)
http://dx.doi.org/10.1364/AO.23.000628


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Abstract

An interferometric method is presented that has been successfully used to measure the alignment precision of different mask patterns superimposed on a silicon wafer in the lithographic process. Based on an extremely precise electrooptical phase measurement technique this method is capable of measuring the relative pattern displacement with precision in the nanometer region. The principle of the measurement technique is described. Results of experiments are discussed including suggestions for improving the measurement precision.

© 1984 Optical Society of America

History
Original Manuscript: June 27, 1983
Published: February 15, 1984

Citation
G. Makosch and F. J. Schoenes, "Interferometric method for checking the mask alignment precision in the lithographic process," Appl. Opt. 23, 628-632 (1984)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-23-4-628

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