Revealing the near-field properties of coupled plasmonic systems by photoemission electron microscopy

2015 Fiscal Year Final Research Report

• Project/Area Number: 26870014
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Physical chemistry; Nanostructural physics
• Research Institution: Hokkaido University
• Principal Investigator: SUN QUAN 北海道大学, 創成研究機構, 特任助教 (90727463)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: Surface plasmon / Plasmon coupling / Near field / Dephasing time / PEEM

Outline of Final Research Achievements

We investigated the near-field properties of several coupled plasmonic systems using photoemission electron microscropy (PEEM). The PEEM measurements allow to obtain near-field mapping and spectral response of plasmonic nanostructures. With this technique we revealed near-field plasmon coupling in one dimensional gold nanochains and observed the energy transport along the nanochians. We also explored plasmon hybridization in gold dolmen nanostructures. Especially, the hybridized bonding and anti-bonding plasmon modes were explored in near field, and the dramatic evolution of near field intensity distribution between bonding and anti-bonding modes was observed. Furthermore, we established a time-resolved PEEM setup to investigate the dynamics of plasmon resonances, and we experimentally demonstrated for the first time that the quadrupole mode in Au nanoblocks has longer dephasing time than that of the dipole mode.

Free Research Field

ナノフォトニクス，非線形光学