Figure 5.

Scheme of the proposed experimental set-up. A sample is mounted over a three-axis translation system and a two-angle tilt system. The probe, e.g. a cubic like block attached to an AFM cantilever, is measured through a fiber-based interferometer (not shown). The drift affecting the distance between the interacting surfaces is controlled using either electrostatic or optical measurements, as sketched the figure

Siria et al. Nanoscale Research Letters 2010 5:1360-1365   doi:10.1007/s11671-010-9633-y