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Cord Arnold

Koordinator för Mötesplats Rydbergseminarier

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Photoemission electron microscopy of localized surface plasmons in silver nanostructures at telecommunication wavelengths

Författare

  • Erik Mårsell
  • Esben Witting Larsen
  • Cord Arnold
  • Hongxing Xu
  • Johan Mauritsson
  • Anders Mikkelsen

Summary, in English

We image the field enhancement at Ag nanostructures using femtosecond laser pulses with a center wavelength of 1.55 mu m. Imaging is based on non-linear photoemission observed in a photoemission electron microscope (PEEM). The images are directly compared to ultra violet PEEM and scanning electron microscopy (SEM) imaging of the same structures. Further, we have carried out atomic scale scanning tunneling microscopy on the same type of Ag nanostructures and on the Au substrate. Measuring the photoelectron spectrum from individual Ag particles shows a larger contribution from higher order photoemission processes above the work function threshold than would be predicted by a fully perturbative model, consistent with recent results using shorter wavelengths. Investigating a wide selection of both Ag nanoparticles and nanowires, field enhancement is observed from 30% of the Ag nanoparticles and from none of the nanowires. No laser-induced damage is observed of the nanostructures neither during the PEEM experiments nor in subsequent SEM analysis. By direct comparison of SEM and PEEM images of the same nanostructures, we can conclude that the field enhancement is independent of the average nanostructure size and shape. Instead, we propose that the variations in observed field enhancement could originate from the wedge interface between the substrate and particles electrically connected to the substrate. (C) 2015 AIP Publishing LLC.

Avdelning/ar

  • Synkrotronljusfysik
  • Atomfysik
  • Fasta tillståndets fysik
  • NanoLund: Centre for Nanoscience

Publiceringsår

2015

Språk

Engelska

Publikation/Tidskrift/Serie

Applied Physics Reviews

Volym

117

Issue

8

Dokumenttyp

Artikel i tidskrift

Förlag

American Institute of Physics (AIP)

Ämne

  • Atom and Molecular Physics and Optics

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1931-9401