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It is well known that residual electrostatic forces create significantdifficulties to precise measurements of the Casimir force and to wide use ofCasimir-operated microdevices. We experimentally demonstrate that with the helpof Ar-ion cleaning of the surfaces it is possible to make electrostatic effectsnegligibly small as compared to the Casimir interaction. Our experimental setupconsists of the dynamic atomic force microscope supplemented with an Ar-ion gunand argon reservoir. The residual potential difference between the Au-coatedsurfaces of a sphere and a plate was measured both before and after the in situAr-ion cleaning. It is shown that this cleaning decreases the magnitude of theresidual potential by up to an order of magnitude and makes it almostindependent on separation. The gradient of the Casimir force was measured usingordinary samples subjected to the Ar-ion cleaning. The obtained results areshown to be in good agreement with both previous precision measurements usingthe specially selected samples and with theoretical predictions of the Lifshitztheory. The conclusion is made that the suggested method of in situ Ar-ioncleaning is effective in reducing the electrostatic effects and therefore is agreat resource for experiments on measuring the Casimir interaction and forCasimir-operated microdevices.

Reducing detrimental electrostatic effects in Casimir-force measurements and Casimir-force-based microdevices