Constraining new forces in the casimir regime using the isoelectronic technique

R. S. Decca, D. López, H. B. Chan, E. Fischbach, D. E. Krause, C. R. Jamell

Research output: Contribution to journalArticlepeer-review

203 Scopus citations


We report the first isoelectronic differential force measurements between an 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 1012 for λ∼200nm, an improvement of ∼10 over previous limits.

Original languageEnglish (US)
Article number240401
JournalPhysical review letters
Issue number24
StatePublished - Jun 24 2005

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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