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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

Published on: October 31, 2019

Multistability in planar liquid crystal wells.

Chong Luo1, Apala Majumdar, Radek Erban

  • 1Mathematical Institute, University of Oxford, 24-29 St. Giles', Oxford OX1 3LB, United Kingdom. luo@maths.ox.ac.uk

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|September 26, 2012
PubMed
Summary
This summary is machine-generated.

This study models liquid crystal devices using Landau-de Gennes theory. It identifies distinct equilibrium profiles and analyzes switching behaviors under electric fields, revealing critical anchoring strengths for different solution types.

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Area of Science:

  • Physics
  • Materials Science
  • Applied Mathematics

Background:

  • Nematic liquid crystals exhibit complex behaviors in microstructured devices.
  • Understanding equilibrium profiles and switching dynamics is crucial for device applications.

Purpose of the Study:

  • To model a planar bistable liquid crystal device using Landau-de Gennes theory.
  • To classify equilibrium profiles and analyze their dependence on anchoring strength.
  • To develop a dynamic model for switching mechanisms driven by dielectric effects.

Main Methods:

  • Utilized Landau-de Gennes theory for nematic liquid crystals.
  • Employed Dirichlet boundary conditions for strong anchoring scenarios.
  • Developed a surface energy model for weak anchoring analysis.
  • Simulated dynamic switching using dielectric effects and electric fields.

Main Results:

  • Identified six classes of equilibrium profiles: diagonal and rotated solutions.
  • Determined that diagonal solutions exist for all anchoring strengths (W ≥ 0).
  • Found rotated solutions emerge only above a critical anchoring strength (Wc > 0).
  • Numerically demonstrated electric-field-induced switching between diagonal and rotated states.

Conclusions:

  • The study provides a theoretical framework for understanding bistable liquid crystal device behavior.
  • Anchoring strength critically influences the existence of different stable states.
  • Dynamic switching is achievable through electric field manipulation and variable anchoring.