Abstract

Optical constants of amorphous GeO_x films as a function of wavelength are determined for the first time, to the best of our knowledge, in thin films grown by laser deposition and dc sputtering of Ge in an oxygen environment. We determined the oxygen content of the films by combining nuclear reaction analysis and Rutherford backscattering spectrometry. Spectroscopic ellipsometry is used to determine the film optical constants. Effective medium modeling is used to simulate the optical properties of the films assuming the films contain a mixture of amorphous Ge and GeO₂. The results show that substoichiometric GeO_x films behave optically as a mixture of amorphous Ge and GeO₂. Films with low oxygen content (x < 1.0) seem to have inhomogeneous oxygen concentrations with depth. The effect of the deposition rate and oxygen pressure (and Ar pressure in sputtered films) on film stoichiometry and optical properties is also discussed.

© 1994 Optical Society of America

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