Lateral Casimir force beyond the proximity-force approximation.

@article{Rodrigues2006LateralCF,
  title={Lateral Casimir force beyond the proximity-force approximation.},
  author={Robson B. Rodrigues and Paulo A. Maia Neto and Astrid Lambrecht and Serge Reynaud},
  journal={Physical review letters},
  year={2006},
  volume={96 10},
  pages={
          100402
        }
}
We argue that the appropriate variable to study a nontrivial geometry dependence of the Casimir force is the lateral component of the Casimir force, which we evaluate between two corrugated metallic plates outside the validity of the proximity-force approximation. The metallic plates are described by the plasma model, with arbitrary values for the plasma wavelength, the plate separation, and the corrugation period, the corrugation amplitude remaining the smallest length scale. Our analysis… 

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