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Proceedings Paper

Classical oscillator dispersion model for optical coatings
Author(s): Joseph H. Apfel
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Paper Abstract

The infrared properties of most oxide films are dominated by the effects of the lattice vibrations which are well represented by a model of superposed classical oscillators. In this model, the complex dielectric constant is a function of one or more classical oscillators hosted in a dielectric medium. Each oscillator is specified by its strength, resonance wavelength, and linewidth or damping. Evaluation of the oscillator parameters takes advantage of the observation by Berreman that a thin film has a strong absorption band for p-polarized light at oblique incidence at the wavelength for which the dielectric constant is zero or nearly zero. Each absorption band corresponds to a lattice vibration band which is represented by an oscillator. The p-polarized transmittance at 45° incidence of 0. 1 micron thick films of iron oxide, silicon oxide and silicon nitride was measured. These data were fitted with dispersion models composed of superposed classical oscillators. The results indicate that the properties of silicon oxide and iron oxide films are each modelled by three classical oscillators hosted in a pure dielectric medium. Similarly, the silicon nitride results are represented by two oscillators.

Paper Details

Date Published: 1 August 1990
PDF: 11 pages
Proc. SPIE 1270, Optical Thin Films and Applications, (1 August 1990); doi: 10.1117/12.20368
Show Author Affiliations
Joseph H. Apfel, Optical Coating Lab. Inc. (United States)

Published in SPIE Proceedings Vol. 1270:
Optical Thin Films and Applications
Reinhard Herrmann, Editor(s)

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