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Cord Arnold

Koordinator för Mötesplats Rydbergseminarier

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Nanoscale imaging of local few-femtosecond near-field dynamics within a single plasmonic nanoantenna.

Författare

  • Erik Mårsell
  • Arthur Losquin
  • Robin Svärd
  • Miguel Miranda
  • Chen Guo
  • Anne Harth
  • Eleonora Lorek
  • Johan Mauritsson
  • Cord Arnold
  • Hongxing Xu
  • Anne L'Huillier
  • Anders Mikkelsen
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Summary, in English

The local enhancement of few-cycle laser pulses by plasmonic nanostructures opens up for spatiotemporal control of optical interactions on a nanometer and few-femtosecond scale. However, spatially resolved characterization of few-cycle plasmon dynamics poses a major challenge due to the extreme length and time scales involved. In this letter, we experimentally demonstrate local variations in the dynamics during the few strongest cycles of plasmon-enhanced fields within individual rice-shaped silver nanoparticles. This was done using 5.5 fs laser pulses in an interferometric time-resolved photoemission electron microscopy setup. The experiments are supported by finite-difference time-domain simulations of similar silver structures. The observed differences in the field dynamics across a single particle do not reflect differences in plasmon resonance frequency or dephasing time. They instead arise from a combination of retardation effects and the coherent superposition between multiple plasmon modes of the particle, inherent to a few-cycle pulse excitation. The ability to detect and predict local variations in the few-femtosecond time evolution of multi-mode coherent plasmon excitations in rationally synthesized nanoparticles can be used in the tailoring of nanostructures for ultrafast and nonlinear plasmonics.

Avdelning/ar

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

Publiceringsår

2015

Språk

Engelska

Sidor

6601-6608

Publikation/Tidskrift/Serie

Nano Letters

Volym

15

Issue

10

Dokumenttyp

Artikel i tidskrift

Förlag

The American Chemical Society (ACS)

Ämne

  • Atom and Molecular Physics and Optics

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1530-6992