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Precise optical properties of metals are very important for accurateprediction of the Casimir force acting between two metallic plates. Thereforewe measured ellipsometrically the optical responses of Au films in a wide rangeof wavelengths from 0.14 mum to 33 mum. The films at various thickness weredeposited at different conditions on silicon or mica substrates. Considerablevariation of the frequency dependent dielectric function from sample to samplewas found. Detailed analysis of the dielectric functions was performed to checkthe Kramers-Kronig consistency, and extract the Drude parameters of the films.It was found that the plasma frequency varies in the range from 6.8 eV to 8.4eV. It is suggested that this variation is related with the film density. X-rayreflectivity measurements support qualitatively this conclusion. The Casimirforce is evaluated for the dielectric functions corresponding to our samples,and for that typically used in the precise prediction of the force. The forcefor our films was found to be 5-14% smaller at a distance of 100 nm between theplates. Noise in the optical data is responsible for the force variation within1%. It is concluded that prediction of the Casimir force between metals with aprecision better than 10% must be based on the material optical responsemeasured from visible to mid-infrared range.

Optical properties of gold films and the Casimir force