Personnel Information

写真b

YOSHIDA HIROYUKI

Organization
School of Engineering
Research Fields, Keywords
liquid crystals, holographic optical elements, applied optics, information display
Teaching and Research Fields
照明、ディスプレイや太陽電池など、光技術は人間社会になくてはならない基盤技術です。従来の光学機器ではレンズやミラーなどの比較的大きい素子を用いて光波が制御されてきましたが、ウェラブルデバイスや自動運転などの新技術への期待が高まるにつれ、軽量・小型・特性可変など、高機能な光学素子が求められています。当研究室では、数ある材料の中でも有機系材料（主に液晶や高分子）に着目し、新しい機能を探求し応用する研究に取り組んでいます。
例えば、液晶は①見た目に透明である（無機材料では難しい）一方で、②分子が秩序性をもっており（機能が現れる）、③外部刺激に応答（制御ができる）します。この独特の特徴はディスプレイに活用されていますが、新しい材料や現象の発見に伴ってAR（拡張現実）機器やセンサ、エネルギーデバイスへの応用も期待されています。新技術の社会実装には新材料や概念の発見、それに基づくデバイス（部材）や応用の提案、デバイスを用いたシステムの開発、そして量産技術開発など多くの要素がありますが、当研究室では材料・概念開発から応用提案を主な立ち位置としつつ、他大学や企業などと共同研究も行いながら研究を進めています。
Syllabus information URL
https://syllabus.kwansei.ac.jp/uniasv2/UnSSOLoginControlFree?REQ_ACTION_DO=/AGA030PLS01Action.do?REQ_FUNCTION_JUMP_START_FLG=1&SLB_LINK_DISP_FLG=689&TCH_NO=240035&REQ_PRFR_FUNC_ID=AGA030
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Career 【 display / non-display 】

  • Affiliation:Kwansei Gakuin University
    Department:School of Engineering
    Title:Associate Professor
    Date:2024.04 -

  • Affiliation:Osaka University
    Department:Division of Electrical, Electronic and Information Engineering
    Title:Lecturer
    Date:2019.10 -

  • Affiliation:Osaka University
    Department:Graduate School of Engineering, Division of Electrical, Electronic and Information Engineering
    Title:Assistant Professor
    Date:2009.04 -

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Research Areas 【 display / non-display 】

  • Research field:Nanotechnology/Materials / Applied physical properties
    Research keywords：molecular materials、electro-optic effect

  • Research field:Nanotechnology/Materials / Optical engineering and photon science
    Research keywords：liquid crystals, electro-optic effect, holographic optical elements

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Papers 【 display / non-display 】

  • Title: Tuning the Reflection Bandwidth of Polarization Volume Gratings by Guest Material Penetration
    Journal name: ACS Applied Optical Materials
    Date of publication: 2023.05
    Author(s): Koichi Igeta, Ayaka Higuchi, Junji Kobashi, Yasushi Tomioka, Shinichiro Oka, Hiroyuki Yoshida

    DOI: 10.1021/acsaom.3c00117
    Type of publication: Research paper (scientific journal)

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  • Title: Geometrical Optics Analysis of Diffraction in Patterned Cholesteric Liquid Crystals
    Journal name: ACS Applied Optical Materials
    Date of publication: 2023.05
    Author(s): Ryotaro Ozaki, Kohdai Saiki, Shunsuke Hashimura, Kazunori Kadowaki, Hiroyuki Yoshida, Masanori Ozaki

    DOI: 10.1021/acsaom.3c00093
    Type of publication: Research paper (scientific journal)

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  • Title: Electro-optics of blue phase liquid crystal in field-perpendicular direction
    Journal name: Applied Physics Letters  vol.122  (16)
    Date of publication: 2023.04
    Author(s): Yuxian Zhang, Hiroyuki Yoshida, Qiong-Hua Wang, Masanori Ozaki

    DOI: 10.1063/5.0142383
    Type of publication: Research paper (scientific journal)

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  • Language: English
    Title: Visualizing Invisible Phase Transitions in Blue Phase Liquid Crystals Using Early Warning Indicators
    Journal name: Small  vol.18  (25)  (p.2200113)
    Date of publication: 2022.06
    Author(s): Takayuki Matsui, Tadayoshi Matsumori, Yuji Ito, Yoko Hase, Hiroyuki Yoshida

    DOI: 10.1002/smll.202200113
    Type of publication: Research paper (scientific journal)

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  • Language: English
    Title: Photo-switching behaviour in liquid crystalline materials incorporating a non-planar dithienylcyclopentene core and their birefringence properties
    Journal name: Liquid Crystals  (p.1 - 13)
    Date of publication: 2022.04
    Author(s): Hsiuhui Chen, Haochun Yang, Hanwen Kuo, Weiting Ko, Kingo Uchida, Hiroyuki Yoshida

    DOI: 10.1080/02678292.2022.2044529
    Type of publication: Research paper (scientific journal)

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Presentations 【 display / non-display 】

  • Language:English
    Conference name:Optics of Liquid Crystals (OLC) 2021 Satellite Workshop (SWS) 2022
    Holding date：2022.09
    Presentation date：2022.09.30
    Title:Detecting the phase transition of blue phases by skewness inversion microscopy
    Presentation type:Oral presentation (invited, special)

  • Language:English
    Conference name:Physics Colloquium Webinar Series Institute Technologi Bandung
    Presentation date：2022.06.28
    Title:Science and technology in liquid crystals with patterned alignment
    Presentation type:Public lecture, seminar, tutorial, course, or other speech

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Committee Memberships 【 display / non-display 】

  • Organization name:Japan Society of Applied Physics
    Committee name:Committee Member, Photonic Division
    Date：2021.04 - 2022.03

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Academic Contribution 【 display / non-display 】

  • Title:The 30th International Display Workshops 2023
    Date：2023.12

  • Title:The 70th JSAP Spring Metting 2023
    Activity type：Academic society, research group, etc.
    Date：2023.03

  • Title:IDW'22 iquid Crystal Technologies Workshops Program Chair
    Activity type：Academic society, research group, etc.
    Date：2022.12

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