Chaotic behavior in Casimir oscillators: A case study for phase-change materials

Fatemeh Tajik, Mehdi Sedighi, Mohammad Khorrami, Amir Ali Masoudi, George Palasantzas*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

9 Citations (Scopus)
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Abstract

Casimir forces between material surfaces at close proximity of less than 200 nm can lead to increased chaotic behavior of actuating devices depending on the strength of the Casimir interaction. We investigate these phenomena for phase-change materials in torsional oscillators, where the amorphous to crystalline phase transitions lead to transitions between high and low Casimir force and torque states, respectively, without material compositions. For a conservative system bifurcation curve and Poincare maps analysis show the absence of chaotic behavior but with the crystalline phase (high force-torque state) favoring more unstable behavior and stiction. However, for a nonconservative system chaotic behavior can take place introducing significant risk for stiction, which is again more pronounced for the crystalline phase. The latter illustrates the more general scenario that stronger Casimir forces and torques increase the possibility for chaotic behavior. The latter is making it impossible to predict whether stiction or stable actuation will occur on a long-term basis, and it is setting limitations in the design of micronano devices operating at short-range nanoscale separations.

Original languageEnglish
Article number042215
Number of pages8
JournalPhysical Review E
Volume96
Issue number4
DOIs
Publication statusPublished - 25-Oct-2017

Keywords

  • PULL-IN PARAMETERS
  • ELECTROSTATIC ACTUATORS
  • DISPERSION FORCES
  • STABILITY
  • MODEL

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