A method for the determination of the optical constants ( n and k ) of thin films with large optical inhomogeneities
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Date
2007
Journal Title
Journal ISSN
Volume Title
Publisher
Journal of Modern Optics
Abstract
The existing methods for determining the optical constants of inhomogeneous
thin films deal with non-absorbing films or at the most with films that have very
small absorption (k < 0:02). In this work, a method is presented for the
determination of the optical constants of inhomogeneous thin films with large
optical inhomogeneities. The optical constants are derived from normal-incidence
measurements of reflectance and transmittance. The refractive index was
modelled by quadratic variation. However, the absorption index was replaced
by its mean value. The accuracy of this assumption was tested and its range of
validity was determined. Subsequently, the method was applied to the
determination of the optical constants of cerium oxide thin films.
Description
Keywords
Optical Constants, Optical Inhomogeneities, Non-absorbing Films
Citation
Journal of Modern Optics, Vol. 54, No. 10, 1453–1465