Correlation between Near-Field Enhancement and Dephasing Time in Plasmonic Dimers

Yaolong Li, Quan Sun, Shuai Zu, Xu Shi, Yunquan Liu, Xiaoyong Hu, Kosei Ueno, Qihuang Gong*, Hiroaki Misawa*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Near-field enhancement and dephasing time play critical roles in several applications of localized surface plasmon resonance. Here, using an example gold dimer system, we reveal the correlation between the near-field enhancement and dephasing time via time-resolved photoemission electron microscopy. Compared with isolated particles, dimers with small gap sizes show stronger near-field enhancement and shorter dephasing times. These results are well reproduced by numerical simulations and further explained by a coupled dipole approximation model. The roles of near- and far-field coupling and plasmon localization in balancing near-field enhancement and dephasing time are also unveiled.

Original languageEnglish
Article number163901
Number of pages6
JournalPhysical Review Letters
Volume124
Issue number16
DOIs
StatePublished - 24 Apr 2020

Keywords

  • METAL NANOPARTICLES
  • DYNAMICS
  • MODES
  • RESONANCES
  • DIPOLE
  • SHAPE
  • SIZE

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