Dynamic measurement and modeling of the Casimir force at the nanometer scale

Kohoutek, John; Ivy Yoke Leng Wan; Mohseni, Hooman
February 2010
Applied Physics Letters;2/8/2010, Vol. 96 Issue 6, p063106
Academic Journal
We present a dynamic method for measurement of the Casimir force with an atomic force microscope (AFM) with a conventional AFM tip. With this method, originally based on the phase of vibration of the AFM tip, we are able to verify the Casimir force at distances of nearly 6 nm with an AFM tip that has a radius of curvature of nearly 100 nm. Until now dynamic methods have been done using large metal spheres at greater distances. Also presented is a theoretical model based on the harmonic oscillator, including nonidealities. This model accurately predicts the experimental data.


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