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arXiv · 1202.5217

The Role of Nonlinear Dynamics in Quantitative Atomic Force Microscopy

Daniel Platz·Daniel Forchheimer·Erik A. Tholén·David B. Haviland
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Abstract

Various methods of force measurement with the Atomic Force Microscope (AFM) are compared for their ability to accurately determine the tip-surface force from analysis of the nonlinear cantilever motion. It is explained how intermodulation, or the frequency mixing of multiple drive tones by the nonlinear tip-surface force, can be used to concentrate the nonlinear motion in a narrow band of frequency near the cantilevers fundamental resonance, where accuracy and sensitivity of force measurement are greatest. Two different methods for reconstructing tip-surface forces from intermodulation spectra are explained. The reconstruction of both conservative and dissipative tip-surface interactions from intermodulation spectra are demonstrated on simulated data.

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Daniel Platz, Daniel Forchheimer, Erik A. Tholén, David B. Haviland. 2012-02-23. The Role of Nonlinear Dynamics in Quantitative Atomic Force Microscopy. https://doi.org/10.1088/0957-4484%2F23%2F26%2F265705

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