Journal
PHYSICAL REVIEW LETTERS
Volume 105, Issue 25, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.250402
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Funding
- DOE [DE-FG02-05ER46247]
- NSF [DMR-0645448]
- European Science Foundation (ESF)
- French National Research Agency (ANR) [ANR-06-NANO-062-MONACO]
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We measure the Casimir force between a gold sphere and a silicon plate with nanoscale, rectangular corrugations with a depth comparable to the separation between the surfaces. In the proximity force approximation (PFA), both the top and bottom surfaces of the corrugations contribute to the force, leading to a distance dependence that is distinct from a flat surface. The measured Casimir force is found to deviate from the PFA by up to 10%, in good agreement with calculations based on scattering theory that includes both geometry effects and the optical properties of the material.
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