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Observing off-resonance motion of nanomechanical resonators as modal superposition

Research output: Contribution to Journal/MagazineJournal article

  • Joshoua Condicion Esmenda
  • Myrron Albert Callera Aguila
  • Jyh-Yang Wang
  • Teik-Hui Lee
  • Chi-Yuan Yang
  • Kung-Hsuan Lin
  • Kuei-Shu Chang-Liao
  • Nadav Katz
  • Sergey Kafanov
  • Yuri Pashkin
  • Chii-Dong Chen
<mark>Journal publication date</mark>5/08/2020
Publication StatusPublished
<mark>Original language</mark>Undefined/Unknown


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 could be obtained by also looking at modal responses at frequencies in between resonances. A common way to do this is to force a mechanical object into oscillations and study its off-resonance behaviour. In this paper, we present visualisation of the modal response shapes for a mechanical drum driven off resonance. By using the frequency modal analysis, we describe these shapes as a superposition of resonance modes. We find that the spatial distribution of the oscillating component of the driving force affects the modal weight or participation. Moreover, we are able to infer the asymmetry of the drum by studying the dependence of the resonance modes shapes on the frequency of the driving force. Our results highlight that dynamic responses of any mechanical system are mixtures of their resonance modes with various modal weights, further giving credence to the universality of this phenomenon.