Optical dielectric functions for amorphous Al2O3 and γ-Al2O3
- 1 October 1988
- journal article
- letter
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 64 (7) , 3727-3730
- https://doi.org/10.1063/1.341367
Abstract
Using the classical oscillator model, the optical dielectric functions for amorphous alumina (a‐Al2O3) and gamma alumina (γ‐Al2O3) thin films prepared by ion implantation and subsequent annealing of sapphire (α‐Al2O3) substrates were determined for the first time from analysis of infrared reflection spectra. Two transverse optical modes at 422 and 721 cm−1 were obtained for the a‐Al2O3 film while four modes at 357, 536, 744, and 807 cm−1 were identified for the γ‐Al2O3 film. Also, the problems involving the analysis of modes with large damping are discussed.This publication has 13 references indexed in Scilit:
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