Issue 34, 2018

Plasmon–plasmon coupling probed by ultrafast, strong-field photoemission with <7 Å sensitivity

Abstract

The coupling of propagating surface plasmon waves and localized plasmon oscillations in nanostructures is an essential phenomenon determining electromagnetic field enhancement on the nanoscale. Here, we use our recently developed ultrafast photoemission near-field probing technique to investigate the fundamental question of plasmon–plasmon coupling and its effect on large field enhancement factors. By measuring and analyzing plasmon field enhancement values at different nanostructured surfaces, we can separate the contributions from propagating and localized plasmons. When resonance conditions are met, a significant field enhancement factor can be attributed to the generation of localized plasmons on surface nanostructures, acting as dipole sources resonantly driven by the propagating plasmon field. Our plasmon–plasmon coupling results can contribute directly to applications in surface-enhanced Raman scattering (SERS) and the development of plasmonic sensors and nanostructured photocathodes.

Graphical abstract: Plasmon–plasmon coupling probed by ultrafast, strong-field photoemission with <7 Å sensitivity

Article information

Article type
Paper
Submitted
25 May 2018
Accepted
07 Aug 2018
First published
08 Aug 2018
This article is Open Access
Creative Commons BY license

Nanoscale, 2018,10, 16261-16267

Plasmon–plasmon coupling probed by ultrafast, strong-field photoemission with <7 Å sensitivity

J. Budai, Z. Pápa, I. Márton, P. Wróbel, T. Stefaniuk, Z. Márton, P. Rácz and P. Dombi, Nanoscale, 2018, 10, 16261 DOI: 10.1039/C8NR04242J

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