Coupled surface polaritons and the Casimir force

Details Coupled surface polaritons and the Casimir force Coupled surface polaritons and the Casimir force

2003-08-26

arxiv.org/abs/physics/0308095v3

Physics

Optics

revised version submitted to Phys. Rev. A, 06 November 2003

Scientific paper

10.1103/PhysRevA.69.023808

The Casimir force between metallic plates made of realistic materials is evaluated for distances in the nanometer range. A spectrum over real frequencies is introduced and shows narrow peaks due to surface resonances (plasmon polaritons or phonon polaritons) that are coupled across the vacuum gap. We demonstrate that the Casimir force originates from the attraction (repulsion) due to the corresponding symmetric (antisymmetric) eigenmodes, respectively. This picture is used to derive a simple analytical estimate of the Casimir force at short distances. We recover the result known for Drude metals without absorption and compute the correction for weakly absorbing materials.

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