Visualization of Plasmonic Couplings Using Ultrafast Electron Microscopy

Haihua Liu*, Thomas E. Gage, Prem Singh, Amit Jaiswal, Richard D. Schaller, Jau Tang, Sang Tae Park, Stephen K. Gray, Ilke Arslan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Hybrids of graphene and metal plasmonic nanostructures are promising building blocks for applications in optoelectronics, surface-enhanced scattering, biosensing, and quantum information. An understanding of the coupling mechanism in these hybrid systems is of vital importance to its applications. Previous efforts in this field mainly focused on spectroscopic studies of strong coupling within the hybrids with no spatial resolution. Here we report direct imaging of the local plasmonic coupling between single Au nanocapsules and graphene step edges at the nanometer scale by photon-induced near-field electron microscopy in an ultrafast electron microscope for the first time. The proximity of a step in the graphene to the nanocapsule causes asymmetric surface charge density at the ends of the nanocapsules. Computational electromagnetic simulations confirm the experimental observations. The results reported here indicate that this hybrid system could be used to manipulate the localized electromagnetic field on the nanoscale, enabling promising future plasmonic devices.

Original languageEnglish (US)
Pages (from-to)5842-5849
Number of pages8
JournalNano letters
Volume21
Issue number13
DOIs
StatePublished - Jul 14 2021
Externally publishedYes

Keywords

  • discrete dipole approximation
  • gold nanocapsule
  • graphene
  • hybriding
  • photon-induced near-field electron microscopy
  • Plasmonic coupling
  • ultrafast electron microscopy

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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