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25 April 2024

» arxiv » 0807.4166

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Stable suspension and dispersion-induced transitions from repulsive Casimir forces between fluid-separated eccentric cylinders
Alejandro W. Rodriguez ; J. N. Munday ; J. D. Joannopoulos ; Federico Capasso ; Diego A. R. Dalvit ; Steven G. Johnson ;
Date:	25 Jul 2008
Abstract:	Using accurate numerical methods 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.
Source:	arXiv, 0807.4166
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