Viscous cavity damping of a microlever in a simple fluid

Details Viscous cavity damping of a microlever in a simple fluid Viscous cavity damping of a microlever in a simple fluid

2009-06-04

arxiv.org/abs/0906.0782v1

Phys. Rev. Lett. 102, 254503 (2009)

Physics

Fluid Dynamics

Phys. Rev. Lett.: submitted 6 February 2009 ; Editorially approved for publication 3 June 2009

Scientific paper

10.1103/PhysRevLett.102.254503

We consider the problem of oscillation damping in air of a thermally actuated microlever as it is gradually approached towards an infinite wall in parallel geometry. As the gap is decreased from 20 nm down to 400 nm, we observe the increasing damping of the lever Brownian motion in the fluid laminar regime. This manifests itself as a linear decrease with distance of the lever quality factor accompanied by a dramatic softening of its resonance, and eventually leads to the freezing of the CL oscillation. We are able to quantitatively explain this behavior by analytically solving the Navier-Stokes equation with perfect slip boundary conditions. Our findings may have implications for microfluidics and micro- nano-electromechanical applications.

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