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Light-Induced Ring Pattern in a Dye-Doped Nematic Liquid Crystal

Departamento de Física and Millennium Institute for Research in Optics, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Casilla 487-3, Santiago 851, Chile
Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad de Concepción, Concepción 129, Chile
Departamento de Química y Biología, Facultad de Ciencias Naturales, Universidad de Atacama, Ave. Copayapu, Copiapó 485, Chile
Author to whom correspondence should be addressed.
Academic Editor: Gaetano Assanto
Appl. Sci. 2021, 11(11), 5285;
Received: 14 May 2021 / Revised: 1 June 2021 / Accepted: 1 June 2021 / Published: 7 June 2021
(This article belongs to the Special Issue Light Beams in Liquid Crystals)
The use of dye-doped liquid crystals allows the amplification of the coupling of light and liquid crystals. Light can induce the self-organization of the molecular order. The appearance of ring patterns has been observed, which has been associated with phase modulation. However, the morphology and dynamics of the ring patterns are not consistent with self-modulation. Based on an experimental setup with two parallel coherence beams orthogonal to a liquid crystal cell, one of which induces photo-isomerization and the other causes illumination, the formation of ring patterns is studied. To use these two coherent beams, we synthesize methylred methyl ester as a dye-dopant, which is photosensitive only to one of the light beams, and a commercial E7 liquid crystal as a matrix. Based on a mathematical model that accounts for the coupling between the concentration of the cis-state and the order parameter, we elucidate the emergence of the rings as forming patterns in an inhomogeneous medium. The bifurcation diagram is analytically characterized. The emergence, propagation of the rings, and the establishment of the ring patterns are in fair agreement with the experimental observations. View Full-Text
Keywords: photo-isomerization in liquid crystals; pattern formation; light-induced phenomena; azo-dye-dopant photo-isomerization in liquid crystals; pattern formation; light-induced phenomena; azo-dye-dopant
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MDPI and ACS Style

Clerc, M.G.; González-Cortés, G.; Hidalgo, P.I.; Letelier, L.A.; Morel, M.J.; Vergara, J. Light-Induced Ring Pattern in a Dye-Doped Nematic Liquid Crystal. Appl. Sci. 2021, 11, 5285.

AMA Style

Clerc MG, González-Cortés G, Hidalgo PI, Letelier LA, Morel MJ, Vergara J. Light-Induced Ring Pattern in a Dye-Doped Nematic Liquid Crystal. Applied Sciences. 2021; 11(11):5285.

Chicago/Turabian Style

Clerc, Marcel G., Gregorio González-Cortés, Paulina I. Hidalgo, Lucciano A. Letelier, Mauricio J. Morel, and Jorge Vergara. 2021. "Light-Induced Ring Pattern in a Dye-Doped Nematic Liquid Crystal" Applied Sciences 11, no. 11: 5285.

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