Monitoring morphological changes in 2D monolayer semiconductors using atom-thick plasmonic nanocavities

Daniel O. Sigle, Jan Mertens, Lars O. Herrmann, Richard W. Bowman, Sandrine Ithurria, Benoit Dubertret, Yumeng Shi, Hui Ying Yang, Christos Tserkezis, Javier Aizpurua, Jeremy J. Baumberg*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

85 Scopus citations

Abstract

Nanometer-sized gaps between plasmonically coupled adjacent metal nanoparticles enclose extremely localized optical fields, which are strongly enhanced. This enables the dynamic investigation of nanoscopic amounts of material in the gap using optical interrogation. Here we use impinging light to directly tune the optical resonances inside the plasmonic nanocavity formed between single gold nanoparticles and a gold surface, filled with only yoctograms of semiconductor. The gold faces are separated by either monolayers of molybdenum disulfide (MoS2) or two-unit-cell thick cadmium selenide (CdSe) nanoplatelets. This extreme confinement produces modes with 100-fold compressed wavelength, which are exquisitely sensitive to morphology. Infrared scattering spectroscopy reveals how such nanoparticle-on-mirror modes directly trace atomic-scale changes in real time. Instabilities observed in the facets are crucial for applications such as heat-assisted magnetic recording that demand long-lifetime nanoscale plasmonic structures, but the spectral sensitivity also allows directly tracking photochemical reactions in these 2-dimensional solids.

Original languageEnglish (US)
Pages (from-to)825-830
Number of pages6
JournalACS Nano
Volume9
Issue number1
DOIs
StatePublished - Jan 27 2015

Keywords

  • 2D-materials
  • molybdenum disulfide
  • nano-optics
  • nanoparticles
  • tunable plasmons
  • waveguides

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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