Defect trajectories and domain-wall loop dynamics during two-frequency switching in a bistable azimuthal nematic device

A.J. Davidson, C.V. Brown, N.J. Mottram, S. Ladak, C.R. Evans

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19 Citations (Scopus)

Abstract

Bistable azimuthal nematic alignment textures have been created in micrometer-scale channels for which one sidewall is smooth and straight and the other possesses a symmetric sawtooth morphology. The optical textures have been observed during dynamic switching between the two stable states in response to dual frequency ac waveform driving of a highly dispersive nematic liquid crystal. The switching processes involves collapsing of filamentlike director reorientation (tilt-wall) loops and the associated motion and annihilation of surface defects along and close to the edge at the sawtooth sidewall. The predictions from both the n-director-based Ericksen-Leslie theory and the Q-tensor theory are in good agreement with the experimental observations
LanguageEnglish
Article number051712
Number of pages9
JournalPhysical Review E: Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
Volume81
Issue number5
DOIs
Publication statusPublished - 27 May 2010

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Saw tooth
Domain Wall
domain wall
Texture
textures
Defects
trajectories
Trajectory
Surface Defects
Collapsing
defects
Nematic Liquid Crystal
surface defects
Tilt
Annihilation
Waveform
Straight
retraining
micrometers
waveforms

Keywords

  • optical textures
  • dynamic switching
  • nematic liquid crystal

Cite this

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AU - Ladak, S.

AU - Evans, C.R.

PY - 2010/5/27

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AB - Bistable azimuthal nematic alignment textures have been created in micrometer-scale channels for which one sidewall is smooth and straight and the other possesses a symmetric sawtooth morphology. The optical textures have been observed during dynamic switching between the two stable states in response to dual frequency ac waveform driving of a highly dispersive nematic liquid crystal. The switching processes involves collapsing of filamentlike director reorientation (tilt-wall) loops and the associated motion and annihilation of surface defects along and close to the edge at the sawtooth sidewall. The predictions from both the n-director-based Ericksen-Leslie theory and the Q-tensor theory are in good agreement with the experimental observations

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