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Chiral optical materials formed by optical vortex illumination

Research Project

Project/Area Number 17K19070
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Research Field Applied physics and engineering and related fields
Research InstitutionChiba University

Principal Investigator

Omatsu Takashige  千葉大学, 大学院工学研究院, 教授 (30241938)

Project Period (FY) 2017-06-30 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2018: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2017: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Keywords光渦 / 軌道角運動量 / スピン軌道相互作用 / 特異点光学 / 超短パルスレーザー / 非線形光学 / 光重合 / 光物性 / 応用光学・量子光工学 / 光ピンセット / 量子エレクトロニクス
Outline of Final Research Achievements

We demonstrated chiral surface relief formation in azo-polymers by illumination of tightly focused 1um picosecond optical vortex pulses. We discovered that the chiral surface relief formation requires several times photo-isomerization cycles. In fact, it is noteworthy that it is difficult to create such chiral surface relief by employing optical vortex pulses with a pulse duration of less than 2 ps.
We also successfully created a millimeter scale helical microfiber by irradiating picosecond visible optical vortex pulses to ultraviolet curing resin via a two-photon-photopolymerization. The resulting helical microfibers exhibited a length of 300um. Also, we could control the helicicity of the fibers only by changing the handedness of incident optical vortex pulses.

Academic Significance and Societal Importance of the Research Achievements

アゾポリマーの螺旋表面レリーフ形成や光重合による自己組織的螺旋ファイバー形成などの現象はこれまですべて1光子吸収を介して光渦の軌道角運動量が物質に転写されたものであった。今回の研究によって2光子吸収などの多光子過程を介しても軌道角運動量が物質に作用することが明らかになった。また、軌道角運動量が作用するのは、主として、吸収のプロセスではなく、ある程度大きな質量として成長した後、力学的に作用することも判明した。これらの研究結果は、光渦の軌道角運動量と物質の相互作用に新たな知見を与えるものである。また、光渦のパルス幅さえ適切に選択すれば、局所的な物質変化がマクロな構造へと成長することも判明した。

Report

(3 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • Research Products

    (6 results)

All 2018

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (5 results) (of which Int'l Joint Research: 5 results,  Invited: 5 results)

  • [Journal Article] Nanoscale chiral surface relief of azo-polymers with nearfield OAM light2018

    • Author(s)
      K. Masuda, R. Shinozaki, Y. Kinezuka, J. Lee, S. Ohno, S. Hashiyada, H. Okamoto, D. Sakai, K. Harada, K. Miyamoto, and T. Omatsu
    • Journal Title

      Optics Express

      Volume: 26 Issue: 17 Pages: 22197-22197

    • DOI

      10.1364/oe.26.022197

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Optical Vortices Create Structured Materials2018

    • Author(s)
      Takashige Omatsu
    • Organizer
      2018 Taiwan-Japan Bilateral Symposium in Optics for Intelligent Information Science & Technology: Biophotonics & Agricultural Photonics
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Creation of Structured Materials with Optical Vortices2018

    • Author(s)
      Takashige Omatsu
    • Organizer
      CLEO 2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Versatile Optical Vortex Sources2018

    • Author(s)
      Takashige Omatsu
    • Organizer
      CLEO-PR2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Twisting light beams2018

    • Author(s)
      Takashige Omatsu
    • Organizer
      Academic innovation forum for graduate students in optics and materials science for Jiangsu providence
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Structured Materials by Ultrafast Vortex Pulses Illumination2018

    • Author(s)
      Takashige Omatsu
    • Organizer
      International Conference on Ultrafast Optical Science UltrafastLight-2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited

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Published: 2017-07-21   Modified: 2020-03-30  

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