Recent theories of physics beyond the standard model have predicted deviations from Newtonian gravity at short distances. In order to test these theories, we have a built an apparatus that can measure attonewton-scale forces between gold masses separated by distances on the order of 25 μm. A micromachined silicon cantilever was used as the force sensor, and its displacement was measured with a fiber interferometer. We have used our measurements to set bounds on the magnitude α and length scale λ of Yukawa-type deviations from Newtonian gravity; our results presented here yield the best experimental limit in the range of λ=6--20 μm.
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Smullin et al. (2005) studied this question.
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