  The lateral Casimir force between a sinusoidally corrugated gold coated plate
and large sphere was measured for surface separations between 0.2 $\mu$m to 0.3
$\mu$m using an atomic force microscope. The measured force shows the required
periodicity corresponding to the corrugations. It also exhibits the necessary
inverse fourth power distance dependence. The obtained results are shown to be
in good agreement with a complete theory taking into account the imperfectness
of the boundary metal. This demonstration opens new opportunities for the use
of the Casimir effect for lateral translation in microelectromechanical
systems.
