Research Institute for Electronic Science, Hokkaido University


LAST UPDATE 2017/02/25

  • 研究者氏名
    Researcher Name

    孫泉 Quan SUN
    助教 Assistant Professor
  • 所属
    Professional Affiliation

    Research Institute for Electronic Science, Hokkaido University

    Green Nanotechnology Research Center
  • 研究キーワード
    Research Keywords

    Ultrafast nanophotonics
    Photoemission Electron Microscopy
    Femtosecond laser micro/nanofabrication
Research Subject
Exploring the near-field properties of plasmonic nanostructures

研究の背景 Background


Metallic nanoparticles exhibit well-known localized surface plasmon resonance (LSPR) associated with the local field enhancement. The near-field properties of LSPRs are very important for better understanding the physics of LSPR and promoting the LSPR-assisted applications, but the access of the near field remains challenging. The recent development of nonlinear photoemission electron microscopy (PEEM) has been demonstrated as a promising approach to investigate the near-field properties of the LSPRs due its advantages in terms of high spatial and temporal resolution, contactless and real-time imaging without scanning, and etc.

研究の目標 Outcome


The main purpose of this study is to apply PEEM in investigating the near-field properties, such as near-field spectra and near-field mapping, of complex coupled plasmonic systems (e.g., nanochains, dolmen, heptamer, stacked nanostructures). We also aim to develop a time-resolved PEEM system to study the dynamics (dephasing) of the LSPRs, and we expect to resolve the plasmon modes with different LSPR wavelengths and/or dephasing times by the time-resolved PEEM measurements.

研究図Research Figure

Fig.1. Near-field spectrum (i.e., the photoemission (PE) intensity vs. the wavelength) and mapping of a gold dolmen nanostructure. Fig.2. Selective excitation of the dipole and quadrupole LSPR modes under oblique incidence with different light polarization. Fig.3. Sketch map of the timeresolved PEEM system, and one typical experimental result giving a LSPR dephasing time of 5 fs.

文献 / Publications

ACS Nano, in press, DOI: 10.1021/acsnano.6b06206. ACS Nano 10, 3835-3842 (2016). Opt. Express, 24, 17728-17737 (2016)..ACS Photonics 1, 538-546 (2014). Light: Sci. Appl. 2, e118 (2013). Opt. Lett. 37, 710-712 (2012).