Measurement of the Casimir force between dissimilar metals

Abstract

The first precise measurement of the Casimir force between dissimilar metals is reported. The attractive force, between a Cu layer evaporated on a microelectromechanical torsional oscillator, and an Au layer deposited on an Al${}_2$O${}_3$ sphere, was measured dynamically with a noise level of 6 fN/$\sqrt{\mathrm{Hz}}$. Measurements were performed for separations in the 0.2-2 $\mu$m range. The results agree to better than 1% in the 0.2-0.5 $\mu$m range with a theoretical model that takes into account the finite conductivity and roughness of the two metals. The observed discrepancies, which are much larger than the experimental precision, can be attributed to a lack of a complete characterization of the optical properties of the specific samples used in the experiment.

6 pages, 4 figures

References in corpus (2)

• Does the Transverse Electric Zero Mode Contribute to the Casimir Effect for a Metal?
• Isotopic Dependence of the Casimir Force

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