Optimization of Force Sensitivity in Q-Controlled Amplitude-Modulation Atomic Force Microscopy

Jongwoo Kim, Baekman Sung, Byung I. Kim, Wonho Jhe

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

We present control of force sensitivity in Q -controlled amplitude-modulation atomic force microscopy (AM-AFM) that is based on the high- Q quartz tuning-fork. It is found that the phase noise is identical to the amplitude noise divided by oscillation amplitude in AM-AFM. In particular, we observe that while Q -control does not compromise the signal-to-noise ratio, it enhances the detection sensitivity because the minimum detectable force gradient is inversely proportional to the effective quality factor for large bandwidths, which is due to reduction of frequency noise. This work demonstrates Q -control in AM-AFM is a useful technique for enhancement of the force sensitivity with increased Q or improvement of the scanning speed with decreased Q .

Original languageAmerican English
Article number054302
JournalPhysics Faculty Publications and Presentations
Volume114
Issue number5
DOIs
StatePublished - 7 Aug 2013

Keywords

  • Q-factor
  • atomic force microscopy
  • phase noise
  • quartz
  • vibrations

EGS Disciplines

  • Physics

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