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Creation of isotropic liquid crystals by intentionally introducing 3D topological defects

Research Project

Project/Area Number 19K21975
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 21:Electrical and electronic engineering and related fields
Research InstitutionOsaka University

Principal Investigator

OZAKI Masanori  大阪大学, 工学研究科, 教授 (50204186)

Project Period (FY) 2019-06-28 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2020: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2019: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Keywords液晶 / 配向欠陥 / 光学的等方性 / ウォール欠陥 / トポロジカル欠陥 / 電気光学効果
Outline of Research at the Start

液晶内に三次元配向欠陥(トポロジカル欠陥)を意図的かつ制御して導入し、新たな液晶秩序(等方性液晶)の創成とその応用の可能性を探る。すなわち、従来、有害なもの不要なものとして排除されてきた液晶内の配向場の不整合(トポロジカル欠陥)を積極的に活用・制御することにより、これまで自然界ではごく限られた条件下でのみ現れていた液晶秩序(コレステリックブルー相やキュービック相と呼ばれる光学的等方状態と類似)を人工的に発現させる。

Outline of Final Research Achievements

The liquid crystal originally forms a uniform molecular orientation state. In this research, we intentionally and controlledly introduced three-dimensional topological defects in liquid crystals, and explored the possibility of creating a new liquid crystal order and its application. That is, by actively utilizing and controlling the alignment field mismatch (topological defect) in the liquid crystal, which has been conventionally excluded as harmful and unnecessary, We aimed to artificially realize the optically isotropic liquid crystal order that has been formed in a limited environment. Using the local photo-alignment technique, the wall defect structures were generated and stabilized, and the state transitions were performed by applying their electric fields.

Academic Significance and Societal Importance of the Research Achievements

従来、有害なもの不要なものとして排除されてきた液晶内のトポロジカル欠陥を積極的に活用・制御することにより、これまで自然界ではごく限られた条件下でのみ現れていた等方的な液晶秩序を人工的に発現させることは独創的で学術的に意義がある。すなわち、液晶は一様配向するべきもので光学的異方性媒質であるという従来の液晶の描像を覆す発想に基づいている。この様なデバイスの実現により、従来の液晶デバイスにおいて不可欠であった偏光子が不要となり、分子の初期配向プロセスも不要となり、しかも従来の液晶デバイスに比べ応答速度が二桁高速な光デバイスが期待できる。

Report

(3 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • Research Products

    (11 results)

All 2021 2020 2019

All Presentation (11 results) (of which Int'l Joint Research: 6 results,  Invited: 2 results)

  • [Presentation] Field-induced reorientation of three-dimensional photonic structure based on blue phase liquid crystal for computer-generated holograms2021

    • Author(s)
      SeongYong Cho, Hiroyuki Yoshida and Masanori Ozaki
    • Organizer
      SPIE Photonics West, Emerging Liquid Crystal Technologies XVI, Digital Forum
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] フレネル型液晶レンズの高抵抗層の抵抗値がレンズ特性に及ぼす効果2021

    • Author(s)
      坪井雄都, 李蕣里, 久保等, 澁谷義一, 尾﨑雅則
    • Organizer
      第68回応用物理学会春季学術講演会,オンライン
    • Related Report
      2020 Annual Research Report
  • [Presentation] Directional Lasing Emission based on Self-Organized Photonic Crystals with Helical Nanostructures2021

    • Author(s)
      SeongYong Cho, Hiroyuki Yoshida, and Masanori Ozaki
    • Organizer
      第68回応用物理学会春季学術講演会,オンライン
    • Related Report
      2020 Annual Research Report
  • [Presentation] Lattice orientation control of cholesteric blue phase and Its hologram application2020

    • Author(s)
      Masanori Ozaki, SeongYong Cho, Hiroyuki Yoshida
    • Organizer
      SPIE Optics and Photonics, Liquid Crystals XX, on line
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 液晶積層構造による直交円偏光への異なるベリー位相付与2020

    • Author(s)
      塚本脩仁,吉田浩之,尾﨑雅則
    • Organizer
      2020年日本液晶学会オンライン研究会,ZOOM
    • Related Report
      2020 Annual Research Report
  • [Presentation] Giant Light Deflection based on Electromechanical Modulation of Cholesteric Liquid Crystal Micro-disc in Nonuniform Nematic Elastic Field2019

    • Author(s)
      Masanori Ozaki, Koki Imamura, and Hiroyuki Yoshida
    • Organizer
      18th edition of Optics of Liquid Crystals (OLC 2019)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Transparent hologram based on patterned cholesteric liquid crystal with self-organized helical nano-structure2019

    • Author(s)
      Masanori Ozaki
    • Organizer
      Global Nanophotonics 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Photo-patterned Cholesteric Liquid Crystals for Transparent Computer-generated Waveguide Holography with Visible Playback Capability2019

    • Author(s)
      SeongYong Cho, Hiroyuki Yoshida, Masanori Ozaki
    • Organizer
      The 26th International Display Workshops (IDW 2019)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Transparent computer-generated waveguide hologram based on a photo-patterned cholesteric liquid crystal2019

    • Author(s)
      SeongYong Cho, Hiroyuki Yoshida, Masanori Ozaki
    • Organizer
      Optics & Photonics Japan 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] ネマティック液晶中に誘起されたリバーススツイスト欠陥の光減衰機2019

    • Author(s)
      西川朋紘、大内智弘、吉田浩之、尾崎雅則
    • Organizer
      2019年日本液晶学会討論会
    • Related Report
      2019 Research-status Report
  • [Presentation] 張宇賢(Yuxian ZHANG)、吉田浩之、高橋美咲、尾崎雅則2019

    • Author(s)
      コレステリックブルー相液晶における双晶の構造
    • Organizer
      2019年日本液晶学会討論会
    • Related Report
      2019 Research-status Report

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Published: 2019-07-04   Modified: 2022-01-27  

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