Research Institute for Electronic Science, Hokkaido University


LAST UPDATE 2019/06/10

  • 研究者氏名
    Researcher Name

    田口敦清 Atsushi TAGUCHI
    准教授 Associate Professor
  • 所属
    Professional Affiliation

    Research Institute for Electronic Science, Hokkaido University

    Laboratory of Photo-System Physics, Photonics and Optical Science
  • 研究キーワード
    Research Keywords

    Nano Spectroscopy & Nano imaging
    Photonics in Deep UV
Research Subject
DUV nanophotonics

研究の背景 Background


Ultraviolet (UV) light has high photon energy and it strongly interacts with materials through the electronic transitions. The unique properties of UV light have been applied in a variety of scientific and industrial applications including microscopy, spectroscopy, lithography, material processing, and so on. We aim to extend the UV technology by combining with plasmonics and nanophotonics, exploring the frontier of UV technology that is realized by highly localized and enhanced UV light at nanoscale.

研究の目標 Outcome

紫外光領域の光と物質との相互作用を活用した高解像度なイメージング技術や物質変換技術を開拓しています。特に、(1)紫外光を用いた生体イメージング技術の開発(Fig. 1)、(2)紫外プラズモニクス(Fig. 2)を中心に進めています。

We are developing high-resolution imaging technique using light-matter interactions in the UV region at nanoscale. Specifically, development of (1) bioimaging techniques using DUV light (Fig. 1) and (2) UV plasmonics (Fig. 2) are currently the main projects.

研究図Research Figure

Fig.1. Excited with deep ultraviolet (DUV) light, Raman scatterings of nucleic acid and amino acid molecules are selectively enhanced due to resonance Raman effect.  We have developed a deep DUV-excited Raman microscope and applied to DUV resonance Raman spectroscopy/imaging of biological cells and so on. We found that lanthanide ions added to the sample solution suppresses molecular degradation due to DUV light, and for the first time, we succeeded in DUV Raman observation of nucleic acid and protein distribution in HeLa cells.

Fig.2. While gold and silver lose their metallic properties in the UV region, aluminum behaves as a metal in the deep UV (DUV). We found that nano-sized aluminum structures work as a plasmonic counterpart in DUV against gold and silver in visible to near IR. We fabricated aluminum nanoparticles and apply to tip-enhanced Raman scattering microscopy, plasmon-enhanced photocatalytic reaction, and nano-electro-optical devices operating at DUV.

文献 / Publications

J. Raman Spectrosc. 40, 1324 (2009); Appl. Phys. Lett. 101, 081110 (2012); Appl. Phys. Lett. 104, 061108 (2014); Nanoscale 7, 17424 (2015); Chem. Rev. 117, 4983 (2017); Chem. Soc. Rev.46, 4077 (2017); Adv. Opt. Mater. 7,1801099 (2019); APL Photonics 4, 021301 (2019).