Scanned-probe lateral-force determination of fluid-dynamic effects near a solid surface in air

Drummond Roby, M. A.; Wetsel, G. C.; Wang, C.-Y.
July 1996
Applied Physics Letters;7/1/1996, Vol. 69 Issue 1, p130
Academic Journal
A calibrated method for the experimental determination of dynamic lateral force using a scanned probe in air has been applied to the measurement of force vs distance as the probe tip approaches a solid surface. The probe is a fused silica fiber vibrated with its axis perpendicular to the surface in a configuration commonly used for distance regulation in near-field scanned optical microscopes. Quantitative agreement of a fluid-dynamic model with the approach data demonstrates that the effects of fluids between the probe and the surface dominate the force on the probe in the optical far field. A two-layer fluid model indicates that fluid-dynamic effects must also be considered in lateral-force determination in the optical near field. © 1996 American Institute of Physics.


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