Stable suspension and dispersion-induced transitions from repulsive Casimir forces between fluid-separated eccentric cylinders
arXiv:0807.4166 · doi:10.1103/PhysRevLett.101.190404
Abstract
Using an exact numerical method for finite nonplanar objects, we demonstrate a stable mechanical suspension of a silica cylinder within a metallic cylinder separated by ethanol, via a repulsive Casimir force between the silica and the metal. We investigate cylinders with both circular and square cross sections, and show that the latter exhibit a stable orientation as well as a stable position, via a method to compute Casimir torques for finite objects. Furthermore, the stable orientation of the square cylinder is shown to undergo an unusual 45 degrees transition as a function of the separation lengthscale, which is explained as a consequence of material dispersion.
Published in Physical Review Letters. Vol. 101, page, 190404 (2008)
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