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Utilizing intentional internal resonance to achieve multi-harmonic atomic force microscopy.

Bongwon Jeong1, Chris Pettit, Sajith Dharmasena

  • 1Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, 1206 West Green Street, Urbana, IL 61801, USA.

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Summary

This study introduces multi-harmonic atomic force microscopy (AFM) that enhances higher harmonics for better imaging. The new design uses nonlinear internal resonance to improve signal quality for advanced surface analysis.

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Area of Science:

  • Physics
  • Materials Science
  • Nanotechnology

Background:

  • Dynamic atomic force microscopy (AFM) typically uses only the fundamental frequency of cantilever deflection.
  • Higher harmonic signals in AFM are often discarded due to low signal-to-noise ratios.
  • These higher harmonics contain valuable information about sample properties.

Purpose of the Study:

  • To introduce a novel multi-harmonic AFM design.
  • To enhance higher harmonic signals through nonlinear internal resonance.
  • To enable simultaneous topographic and compositional mapping with improved resolution.

Main Methods:

  • Development of a new multi-harmonic AFM design.
  • Exploitation of nonlinear internal resonance triggered by tip-sample interactions.
  • Theoretical and experimental validation of the enhanced harmonic signals.
  • AFM measurements on an inhomogeneous polymer specimen.

Main Results:

  • Successfully enhanced higher harmonic signals in AFM measurements.
  • Demonstrated robust incorporation of nonlinear internal resonance.
  • Achieved simultaneous topography and compositional mapping with reduced crosstalk.
  • Showcased improved performance on inhomogeneous polymer samples.

Conclusions:

  • The proposed multi-harmonic AFM design effectively enhances higher harmonics.
  • Nonlinear internal resonance is a viable mechanism for improving AFM signal quality.
  • This technique offers enhanced capabilities for simultaneous surface characterization.