Research Institute for Electronic Science, Hokkaido University


LAST UPDATE 2021/06/07

  • 研究者氏名
    Researcher Name

    鄭安婕 An-Chieh CHENG
    助教 Assistant Professor
  • 所属
    Professional Affiliation

    Research Institute for Electronic Science, Hokkaido University

    光科学研究部門 光システム物理研究分野
    Photonics and Optical Science Laboratory of Photo-System Physics
  • 研究キーワード
    Research Keywords

    Chiral crystallization
    Optical manipulation
Research Subject

Enantioselection in chiral crystallization controlled by plasmonic manipulation.

研究の背景 Background

Plasmonic optical trapping is a powerful tool to control subject using enhanced, evanescent electromagnetic fields. Also, the enhanced electromagnetic field is way beyond the diffraction limit, providing a promising future to optically control objects down to the nanoscale, such as molecules. The confine electromagnetic fields in nanogap are comparable to molecule size, stronger interaction between light and molecules are expected. Plasmonic optical trapping is introduced in my research to induce the crystallization of chiral materials.

研究の目標 Outcome

Plasmonic optical trapping can successfully trigger the crystallization from both organic and inorganic compounds. Not only the crystallization is realized, but the crystal chirality can also be controlled by plasmonic optical trapping through the circular polarization of the incident light. The enantioselectivity achieved by plasmonic optical trapping is higher than when using standard laser trapping methods (optical tweezers). Deeper understanding of the mechanism is expected to be revealed by tailoring the design of plasmonic nanostructures.

研究図Research Figure

Fig.1. The crystal chirality can be controlled by the right-handed (r) and left-handed (l) circular polarization.

Fig.2. SEM images of (a) a triangular trimer gold nanostructure and (b) its periodic pattern of the nanostructures on a cover glass.

Fig.3. The transmission image of a crystal created by plasmonic optical trapping.

文献 / Publications

  1. Phys. Chem. Lett. 11, 11, 4422 (2020). J. Phys. Chem. C. 124, 6913 (2020).