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Issue 24, 2012
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Focal conics in a smectic-A liquid crystal in microwrinkle grooves

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Abstract

Focal conic domains (FCDs) in smectic-A (SmA) liquid crystals (LCs) are a broad class of curvature defects in a layered system. Here, we report a regular array of FCDs in octylcyanobiphenyl in a SmA phase confined within sinusoidal microgrooves of microwrinkles with a specific periodicity. A semi-hybrid alignment is imposed by the air–LC interface (homeotropic) and the LC–curved-microwrinkle interface (unidirectional planar). The FCDs are periodically packed along the groove direction when the wrinkle wavelength is larger than a critical value of approximately 4 μm. The periodicity of the FCDs monotonically increases with increasing the wrinkle wavelength. From our optical observation, we propose an internal layer structure of the FCDs composed of a set of Dupin cyclides with the eccentricity of the basic ellipse being approximately 0.75.

Graphical abstract: Focal conics in a smectic-A liquid crystal in microwrinkle grooves

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Article information


Submitted
23 Feb 2012
Accepted
24 Apr 2012
First published
17 May 2012

Soft Matter, 2012,8, 6438-6444
Article type
Paper

Focal conics in a smectic-A liquid crystal in microwrinkle grooves

T. Ohzono, Y. Takenaka and J. Fukuda, Soft Matter, 2012, 8, 6438
DOI: 10.1039/C2SM25416F

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