Repulsive Casimir Force between Dielectric Planes

Details Repulsive Casimir Force between Dielectric Planes Repulsive Casimir Force between Dielectric Planes

2001-09-26

arxiv.org/abs/quant-ph/0109134v1

Physics

Quantum Physics

7 pages, 1 figure

Scientific paper

In 1948 H.B.G.Casimir predicted that an attractive force between two perfectly conducting neutral plates exists due to changes in the electromagnetic vacuum energy caused by the influence of the plates. In 1956 E.M. Lifshitz derived an extension of Casimir's expression applicable to finite temperatures and arbitrary dielectric constants for the two half-spaces and the gap in between them. It is shown in this brief report that, while the Lifshitz formula predicts an attractive force for the case of identical dielectric constants for the two half-spaces, a repulsive force results in some circumstances when the dielectric constants are not identical. The reason for the repulsive force and possible applications will be considered.

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