Hot-electron nanoscopy using adiabatic compression of surface plasmons

Andrea Giugni, Bruno Torre, Andrea Toma, Marco Francardi, Mario Malerba, Alessandro Alabastri, Remo Proietti Zaccaria, Mark Mark Stockman, Enzo M. Di Fabrizio

Research output: Contribution to journalArticlepeer-review

190 Scopus citations

Abstract

Surface plasmon polaritons are a central concept in nanoplasmonics and have been exploited to develop ultrasensitive chemical detection platforms, as well as imaging and spectroscopic techniques at the nanoscale. Surface plasmons can decay to form highly energetic (or hot) electrons in a process that is usually thought to be parasitic for applications, because it limits the lifetime and propagation length of surface plasmons and therefore has an adverse influence on the functionality of nanoplasmonic devices. Recently, however, it has been shown that hot electrons produced by surface plasmon decay can be harnessed to produce useful work in photodetection, catalysis and solar energy conversion. Nevertheless, the surface-plasmon-to-hot-electron conversion efficiency has been below 1% in all cases. Here we show that adiabatic focusing of surface plasmons on a Schottky diode-terminated tapered tip of nanoscale dimensions allows for a plasmon-to-hot-electron conversion efficiency of ∼30%. We further demonstrate that, with such high efficiency, hot electrons can be used for a new nanoscopy technique based on an atomic force microscopy set-up. We show that this hot-electron nanoscopy preserves the chemical sensitivity of the scanned surface and has a spatial resolution below 50 nm, with margins for improvement.
Original languageEnglish (US)
Pages (from-to)845-852
Number of pages8
JournalNature Nanotechnology
Volume8
Issue number11
DOIs
StatePublished - Oct 20 2013

ASJC Scopus subject areas

  • Biomedical Engineering
  • Bioengineering
  • Materials Science(all)
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering
  • Condensed Matter Physics

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