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Coupled surface polaritons and the Casimir force

Abstract : 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 vacuun gap. We demonstrate that the Casimir force orginates 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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Submitted on : Thursday, February 22, 2007 - 4:00:17 PM
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Carsten Henkel, Karl Joulain, Jean-Philippe Mulet, Jean-Jacques Greffet. Coupled surface polaritons and the Casimir force. Physical Review A, American Physical Society, 2004, 69, pp.023808-1 0à 023808-7. ⟨10.1103/PhysRevA.69.023808⟩. ⟨hal-00132816⟩



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