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

Davidson, A. J., Brown, C. V., Mottram, N. J., Ladak, Sam ORCID: https://orcid.org/0000-0002-0275-0927 and Evans, C. R. 2010. Defect trajectories and domain-wall loop dynamics during two-frequency switching in a bistable azimuthal nematic device. Physical Review E: Statistical, Nonlinear, and Soft Matter Physics 81 (5) , 051712. 10.1103/PhysRevE.81.051712

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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.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QC Physics
Publisher:	American Physical Society
ISSN:	1539-3755
Last Modified:	21 Oct 2022 09:03
URI:	https://orca.cardiff.ac.uk/id/eprint/35185

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