Plasmonic near-electric field enhancement effects in ultrafast photoelectron emission: Correlated spatial and laser polarization microscopy studies of individual Ag nanocubes

Andrej Grubisic, Emilie Ringe, Claire M. Cobley, Younan Xia, Laurence Marks, Richard P Van Duyne*, David J. Nesbitt

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

57 Scopus citations

Abstract

Electron emission from single, supported Ag nanocubes excited with ultrafast laser pulses (λ = 800 nm) is studied via spatial and polarization correlated (i) dark field scattering microscopy (DFM), (ii) scanning photoionization microscopy (SPIM), and (iii) high-resolution transmission electron microscopy (HRTEM). Laser-induced electron emission is found to peak for laser polarization aligned with cube diagonals, suggesting the critical influence of plasmonic near-field enhancement of the incident electric field on the overall electron yield. For laser pulses with photon energy below the metal work function, coherent multiphoton photoelectron emission (MPPE) is identified as the most probable mechanism responsible for electron emission from Ag nanocubes and likely metal nanoparticles/surfaces in general.

Original languageEnglish (US)
Pages (from-to)4823-4829
Number of pages7
JournalNano Letters
Volume12
Issue number9
DOIs
StatePublished - Sep 12 2012

Keywords

  • Ag nanocubes
  • Coherent multiphoton photoelectron emission
  • localized surface plasmon resonance
  • scanning photoionization microscopy
  • single-particle dark field scattering
  • ultrafast excitation

ASJC Scopus subject areas

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

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