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Proceedings Paper

Near-grazing-angle reflectometry of absorbing media
Author(s): Antonio Jefersen de Deus Moreno; Alexandre V. Ghiner; Ritta Vitlina; Gregory I. Surdutovich; Antonio Carlos Pereira
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Paper Abstract

A new technique to obtain the real and imaginery parts of the dielectric function of an absorbing medium in terms of the ration R'p/R's of the derivatives of p and s polarized light reflectances at the grazing and the normal incidence is developed. IT is shown that this ratio can be expressed through the logarithmic derivatives (1/R)R' in the vicinity of the grazing angle. The using of both the normal - incidence and near- grazing angles measurements allows to overcome the instability (extreme sensitivity to experimental error) of all inversion of the polarized reflectances methods for absorbing media. The possibility of this method is verified by the Jacobian formalism. It is important that errors in the measured parameters are not magnified when calculating the optical constants from the experimental data. We propose the practical implementation of this method with variation of the angle of incidence in an optical fashion. IT permits to perform all the measurements appreciably aside from the grazing angle and greatly enhance the accuracy of these measurements.

Paper Details

Date Published: 11 October 2000
PDF: 8 pages
Proc. SPIE 4103, Optical Diagnostic Methods for Inorganic Materials II, (11 October 2000); doi: 10.1117/12.403583
Show Author Affiliations
Antonio Jefersen de Deus Moreno, Univ. Federal do Maranhao (Brazil)
Alexandre V. Ghiner, Univ. Federal do Maranhao (Brazil)
Ritta Vitlina, Univ. Federal do Parana (Brazil)
Gregory I. Surdutovich, Univ. Federal do Parana (Brazil)
Antonio Carlos Pereira, Univ. Federal do Maranhao (Brazil)

Published in SPIE Proceedings Vol. 4103:
Optical Diagnostic Methods for Inorganic Materials II
Leonard M. Hanssen, Editor(s)

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