Stable Suspension and Dispersion-Induced Transitions from Repulsive Casimir Forces Between Fluid-Separated Eccentric Cylinders
Rodriguez, Alejandro W.
Munday, J. N.
Joannopoulos, J. D.
Dalvit, Diego A. R.
Johnson, Steven G.
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CitationRodriguez, Alejandro W., J. N. Munday, J. D. Joannopoulos, Federico Capasso, Diego A. R. Dalvit, and Steven G. Johnson. 2008. “Stable Suspension and Dispersion-Induced Transitions from Repulsive Casimir Forces Between Fluid-Separated Eccentric Cylinders.” Physical Review Letters 101 (19). https://doi.org/10.1103/physrevlett.101.190404.
AbstractWe numerically 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 undergoes a 45 degrees transition as the separation length scale is varied, which is explained as a consequence of material dispersion.
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