Three-dimensional crystal orientation of blue phase liquid crystals on surfaces

H. Yoshida, M. Takahashi, T. Ohkawa, Junichi Fukuda, Hirotsugu Kikuchi, M. Ozaki

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Liquid crystalline cholesteric blue phases (BPs) are of high interest for tunable electro-optic applications owing to their fast response times and quasi-polarization-independent phase modulation capabilities. Various approaches have recently been proposed to control the crystal orientation of BPs on substrates, but their basic orientation properties on standard, unidirectionally orienting substrates had not been investigated in detail. Here, detailed studies have been made on the Kossel diagrams of BPs on unidirectionally orienting substrates to understand the three-dimensional crystal orientation of BPs. We find that BPs show strong thermal hysteresis and that the structure of the preceding phase determines the orientation of BPs. Specifically, the BP II-I transition is accompanied by a rotation of the crystal such that the crystal direction defined by certain low-value Miller indices transform into different directions, and within the allowed rotations, different azimuthal configurations are obtained in the same cell depending on the thermal process. Our findings demonstrate that, for the alignment control of BPs, the thermal process is as important as the properties of the alignment layer.

Original languageEnglish
Title of host publicationLiquid Crystals XXII
EditorsIam Choon Khoo
PublisherSPIE
ISBN (Electronic)9781510620414
DOIs
Publication statusPublished - Jan 1 2018
EventLiquid Crystals XXII 2018 - San Diego, United States
Duration: Aug 19 2018Aug 20 2018

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume10735
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherLiquid Crystals XXII 2018
CountryUnited States
CitySan Diego
Period8/19/188/20/18

Fingerprint

Liquid Crystals
Crystal orientation
Liquid Crystal
Liquid crystals
Crystal
liquid crystals
Three-dimensional
Substrates
crystals
Crystals
alignment
Phase modulation
Electrooptical effects
Hysteresis
Substrate
phase modulation
Polarization
electro-optics
Crystalline materials
hysteresis

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Yoshida, H., Takahashi, M., Ohkawa, T., Fukuda, J., Kikuchi, H., & Ozaki, M. (2018). Three-dimensional crystal orientation of blue phase liquid crystals on surfaces. In I. C. Khoo (Ed.), Liquid Crystals XXII [107350I] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 10735). SPIE. https://doi.org/10.1117/12.2323159

Three-dimensional crystal orientation of blue phase liquid crystals on surfaces. / Yoshida, H.; Takahashi, M.; Ohkawa, T.; Fukuda, Junichi; Kikuchi, Hirotsugu; Ozaki, M.

Liquid Crystals XXII. ed. / Iam Choon Khoo. SPIE, 2018. 107350I (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 10735).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Yoshida, H, Takahashi, M, Ohkawa, T, Fukuda, J, Kikuchi, H & Ozaki, M 2018, Three-dimensional crystal orientation of blue phase liquid crystals on surfaces. in IC Khoo (ed.), Liquid Crystals XXII., 107350I, Proceedings of SPIE - The International Society for Optical Engineering, vol. 10735, SPIE, Liquid Crystals XXII 2018, San Diego, United States, 8/19/18. https://doi.org/10.1117/12.2323159
Yoshida H, Takahashi M, Ohkawa T, Fukuda J, Kikuchi H, Ozaki M. Three-dimensional crystal orientation of blue phase liquid crystals on surfaces. In Khoo IC, editor, Liquid Crystals XXII. SPIE. 2018. 107350I. (Proceedings of SPIE - The International Society for Optical Engineering). https://doi.org/10.1117/12.2323159
Yoshida, H. ; Takahashi, M. ; Ohkawa, T. ; Fukuda, Junichi ; Kikuchi, Hirotsugu ; Ozaki, M. / Three-dimensional crystal orientation of blue phase liquid crystals on surfaces. Liquid Crystals XXII. editor / Iam Choon Khoo. SPIE, 2018. (Proceedings of SPIE - The International Society for Optical Engineering).
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