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Constraining New Forces in the Casimir Regime Using the Isoelectronic Technique

R. S. Decca·D. Lopez·H. B. Chan·E. Fischbach·D. E. Krause·C. Jamell
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Abstract

We report the first isoelectronic differential force measurements between a Au-coated probe and two Au-coated films, made out of Au and Ge. These measurements, performed at submicron separations using soft microelectromechanical torsional oscillators, eliminate the need for a detailed understanding of the probe-film Casimir interaction. The observed differential signal is directly converted into limits on the parameters $α$ and $λ$ which characterize Yukawa-like deviations from Newtonian gravity. We find $α\lsim 10^{12}$ for $λ\sim 200$ nm, an improvement of $\sim$ 10 over previous limits.

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R. S. Decca, D. Lopez, H. B. Chan, E. Fischbach, D. E. Krause, C. Jamell. 2005-02-02. Constraining New Forces in the Casimir Regime Using the Isoelectronic Technique. https://doi.org/10.1103/physrevlett.94.240401

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