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APS » Journals » Phys. Rev. Lett. » Volume 94 » Issue 24
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Phys. Rev. Lett. 94, 240401 (2005) [4 pages]

Constraining New Forces in the Casimir Regime Using the Isoelectronic Technique

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R. S. Decca1,*, D. López2, H. B. Chan3, E. Fischbach4, D. E. Krause5,4, and C. R. Jamell1
1Department of Physics, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana 46202, USA
2Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974, USA
3Department of Physics, University of Florida, Gainesville, Florida 32611, USA
4Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA
5Physics Department, Wabash College, Crawfordsville, Indiana 47933, USA

Received 1 February 2005; published 20 June 2005

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∼200  nm, an improvement of ∼10 over previous limits.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.240401
DOI:
10.1103/PhysRevLett.94.240401
PACS:
03.70.+k, 12.20.Ds, 12.20.Fv, 42.50.Lc

*Electronic address: rdecca@iupui.edu

 
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