title: Casimir force on a surface with shallow nanoscale corrugations: geometry and finite conductivity effects.
abstract: 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.
authors.affiliation: Department of Physics, University of Florida, Gainesville, Florida 32611, USA.
authors.forename: Y
authors.initials: Y
authors.lastname: Bao
authors.forename: R
authors.initials: R
authors.lastname: Guérout
authors.forename: J
authors.initials: J
authors.lastname: Lussange
authors.forename: A
authors.initials: A
authors.lastname: Lambrecht
authors.forename: R A
authors.initials: RA
authors.lastname: Cirelli
authors.forename: F
authors.initials: F
authors.lastname: Klemens
authors.forename: W M
authors.initials: WM
authors.lastname: Mansfield
authors.forename: C S
authors.initials: CS
authors.lastname: Pai
authors.forename: H B
authors.initials: HB
authors.lastname: Chan