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arXiv 0812.1498quant-ph
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薄金属板上的Casimir压力

Casimir pressure on a thin metal slab

Marin-Slobodan Tomas, Zdravko Lenac

摘要:

本文考虑了腔体中金属板边界上的真空场压力,采用等离子体模型,特别考虑了表面等离子体极化激元对压力的贡献。结果表明,随着腔长的增加,系统中作用在d<<λ P的薄板上的压力从零板镜距离时的Casimir压力F_C减小到孤立板情况下的单位面积无延迟力F_nr=1.19(d/λ P)F_C。在第一种情况下,压力完全是由于通过金属传播的光子模式,而在第二种情况下,它完全是由于(非延迟)的表面等离子体模式支持的独立薄板。在任何一种情况下,压力都随着板坯厚度的增加而减小。这些考虑表明,薄金属层上的真空场压力(及其模态结构)可以在改变腔长度时显著影响对称腔。

英文摘要:

We consider the vacuum-field pressure on boundaries of a metal slab in the middle of a cavity with perfectly reflecting mirrors adopting the plasma model for the metal and paying special attention to the surface plasmon polariton contribution to the pressure. We demonstrate that, with increasing cavity length, the pressure on a thin (d<<λ_P) slab in this system decreases from the Casimir pressure F_C at zero slab-mirror distances to the non-retarded force per unit area F_nr=1.19 (d/λ_P)F_C in the case of an isolated slab. In the first case the pressure is entirely due to the photonic modes propagating through the metal whereas in the second case it is entirely due to the (nonretarded) surface plasmon modes supported by the free-standing thin slab. In either case the pressure decreases with the slab thickness. These considerations indicate that the vacuum-field pressure on a thin metal layer (and its modal structure) can be in a symmetric cavity significantly influenced when changing the cavity length.

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