In Situ Optical Characterization of Twinning in Liquid Crystalline Blue Phases

Yuxian Zhang, Hiroyuki Yoshida, Seongyong Cho, Jun Ichi Fukuda, Masanori Ozaki

Research output: Contribution to journalArticlepeer-review

Abstract

Crystal twinning is an intergrowth of two or more single crystals of the same species with specific crystallographic relations in their orientations. Here, we perform microscopic optical characterization of (211) twins in the three-dimensional liquid crystalline phase known as the blue phase (BP), with I4132 space group symmetry. We describe the effect of twinning on the optical diffraction pattern - Kossel pattern - of blue phases and analyze the patterns to deduce structural information such as the twin elements and the previously unnoticed deviations from the perfect cubic structure at zero electric field. Further, we obtain in situ observations as a field is applied along the [110] direction of the twinning crystals and find that the twin boundary shows a pinning effect that defines the orientation of the twinned pair through the cubic-to-orthogonal structure transformation. Our findings not only provide important insights for the application of BPs as electro-optic crystals but also present a step in understanding the hierarchical structures that are crystallographic.

Original languageEnglish
Pages (from-to)36130-36137
Number of pages8
JournalACS Applied Materials and Interfaces
Volume13
Issue number30
DOIs
Publication statusPublished - Aug 4 2021

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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