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Imaging Off-Resonance Nanomechanical Motion as Modal Superposition

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  • J.C. Esmenda
  • M.A.C. Aguila
  • J.-Y. Wang
  • T.-H. Lee
  • C.-Y. Yang
  • K.-H. Lin
  • K.-S. Chang-Liao
  • N. Katz
  • S. Kafanov
  • Y.A. Pashkin
  • C.-D. Chen
Article number2005041
<mark>Journal publication date</mark>31/07/2021
<mark>Journal</mark>Advanced Science
Issue number13
Number of pages9
Publication StatusPublished
Early online date19/05/21
<mark>Original language</mark>English


Observation of resonance modes is the most straightforward way of studying mechanical oscillations because these modes have maximum response to stimuli. However, a deeper understanding of mechanical motion can be obtained by also looking at modal responses at frequencies in between resonances. Here, an imaging of the modal responses for a nanomechanical drum driven off resonance is presented. By using the frequency modal analysis, these shapes are described as a superposition of resonance modes. It is found that the spatial distribution of the oscillating component of the driving force, which is affected by both the shape of the actuating electrode and inherent device properties such as asymmetry and initial slack, greatly influences the modal weight or participation. This modal superposition analysis elucidates the dynamics of any nanomechanical system through modal weights. This aids in optimizing mode-specific designs for force sensing and integration with other systems.