Abstract

The optical constants for iron oxide films have been obtained for the infrared spectral region by fitting the measured transmittance with a classical oscillator model.¹,² The primary lattice vibration bands were identified from the p-polarized transmittance at 45° of an 0.08-µm thick film on germanium as described by Berreman.³ The location, intensity, and width of three superposed oscillators were adjusted to agree with the lattice vibration bands that were observed. The model also requires the high frequency dielectric constant which was estimated from the refractive index in the near infrared region where the film is completely transparent. The oscillator model is shown to provide good prediction of the normal incidence transmittance of a 3.9-µm film on germanium. Both films were prepared by reactive evaporation of iron metal using an activated process known as plasma plating or ion plating.

© 1989 Optical Society of America