Classical oscillator dispersion model for optical coatings

Joseph H. Apfel

doi:10.1117/12.20368

1 August 1990 Classical oscillator dispersion model for optical coatings

Joseph H. Apfel

Proceedings Volume 1270, Optical Thin Films and Applications; (1990) https://doi.org/10.1117/12.20368
Event: The International Congress on Optical Science and Engineering, 1990, The Hague, Netherlands

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.

Citation Download Citation

Joseph H. Apfel "Classical oscillator dispersion model for optical coatings", Proc. SPIE 1270, Optical Thin Films and Applications, (1 August 1990); https://doi.org/10.1117/12.20368

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available