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Proceedings Paper

Spontaneous light-induced Turing patterns in a dye-doped twisted nematic layer: Theory and experiments (Conference Presentation)
Author(s): Marcel G. Clerc

Paper Abstract

Optical pattern formation is usually due either to the combination of diffraction and nonlinearity in a Kerr medium or the temporal modulation of light in a photosensitive chemical reaction. We present a different mechanism by which light spontaneously induces stripe domains between nematic states in a twisted nematic liquid crystal layer doped with azo-dyes. Due to the photoisomerization process of the dopants, light creates dissipative structures without the need of temporal modulation, diffraction, Kerr or other optical nonlinearity, but based on the different scales for dopant transport processes and nematic order parameter, which identifies a Turing mechanism for this instability. Theoretically, the emergence of the stripe patterns is described by a model for the dopant concentration coupled with the nematic order parameter.

Paper Details

Date Published: 18 September 2018
Proc. SPIE 10735, Liquid Crystals XXII, 107350M (18 September 2018); doi: 10.1117/12.2319213
Show Author Affiliations
Marcel G. Clerc, Univ. de Chile (Chile)

Published in SPIE Proceedings Vol. 10735:
Liquid Crystals XXII
Iam Choon Khoo, Editor(s)

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