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

Takuya Ohzono, Yoshiko Takenaka, Junichi Fukuda

Research output: Contribution to journalArticle

15 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)6438-6444
Number of pages7
JournalSoft Matter
Volume8
Issue number24
DOIs
Publication statusPublished - Jun 28 2012

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Liquid Crystals
grooves
liquid crystals
Wavelength
periodic variations
ellipses
Defects
eccentricity
wavelengths
Air
alignment
curvature
air
defects

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics

Cite this

Focal conics in a smectic-A liquid crystal in microwrinkle grooves. / Ohzono, Takuya; Takenaka, Yoshiko; Fukuda, Junichi.

In: Soft Matter, Vol. 8, No. 24, 28.06.2012, p. 6438-6444.

Research output: Contribution to journalArticle

Ohzono, Takuya ; Takenaka, Yoshiko ; Fukuda, Junichi. / Focal conics in a smectic-A liquid crystal in microwrinkle grooves. In: Soft Matter. 2012 ; Vol. 8, No. 24. pp. 6438-6444.
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