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Applied Optics

Applied Optics


  • Vol. 19, Iss. 4 — Feb. 15, 1980
  • pp: 561–573

Ellipsometry of rough surfaces

T. V. Vorburger and K. C. Ludema  »View Author Affiliations

Applied Optics, Vol. 19, Issue 4, pp. 561-573 (1980)

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Ellipsometry measurements on several different kinds of rough surfaces were compared with stylus measurements of the surface texture. For steeply sloped periodic surfaces, the ellipsometric angles Δ and ψ varied rapidly as the angle of incidence was varied near a diffraction minimum. This effect is interpreted in terms of the Kirchhoff theory and is ascribed to interference between singly and doubly reflected light waves. For a set of Ni replicas of machined surfaces with random surface profiles, Δ and ψ varied systematically with surface texture. These variations persisted even after the surface composition was changed by evaporating first Al then Au on the surfaces. The systematic effects due to surface roughness are in disagreement with those of a previous experiment and are not readily explainable in terms of the Kirchhoff theory. The possible reasons for this are discussed along with the prospects for using ellipsometry as a tool for measuring surface roughness.

© 1980 Optical Society of America

Original Manuscript: August 31, 1979
Published: February 15, 1980

T. V. Vorburger and K. C. Ludema, "Ellipsometry of rough surfaces," Appl. Opt. 19, 561-573 (1980)

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  1. For an extensive review of the subject see R. M. A. Azzam, N. M. Bashara, Ellipsometry and Polarized Light (North-Holland, Amsterdam, 1977).
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