How AFM Works 2-2 Non-Contact Mode

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In this technique, the cantilever oscillates just above the surface as it scans. A precise, high-speed feedback loop prevents the cantilever tip from crashing into the surface, keeping the tip sharp and leaving the surface untouched. As the tip approaches the sample surface, the oscillation amplitude of the cantilever decreases. By using the feedback loop to correct for these amplitude deviations, one can generate an image of the surface topography.

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  1. Park Systems
  2. Atomic Force Microscopy
  3. Non-contact Atomic Force Microscopy
  4. Nanotechnology (Field Of Study)
  5. AFM
  6. How AFM Works
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What you explain on this video is amplitude modulation, not "Non-contact AFM". NC-AFM is based on the attractive part of the amplitude-distance curve and mostly done by tracking the frequency shift of the first Eigenmode of the cantilever, while maintaining the amplitude constant by adjusting the drive. Doing amplitude-modulation (e.g. Tapping) on the attractive part of the force-distance curve is rather tricky and need a minima the recording of the phase of the oscillator to measure a negative shift.

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