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Title: Coexistence of classical and quantum plasmonics in large plasmonic structures with subnanometer gaps

Large metal nanostructures with subnanometer interparticle separations (gaps) can provide extremely high local fields and are of particular interest in surface enhanced spectroscopy, as well as for basic understanding of plasmonics. In this experimental electron energy loss study, we monitor the transition of plasmonic dimers from a classical to a quantum system by decreasing gaps to dimensions when tunneling occurs and a conductive nanobridge evolves. Our studies show that silver dimers with atomic scale gaps can exhibit a regime, in which charge transfer plasmon modes, as a hallmark of a quantum nature, and “classical” bright and dark dipolar plasmon modes can be seen simultaneously.
Authors:
;  [1] ; ;  [2]
  1. Technical University of Denmark, Center for Electron Nanoscopy, Kgs. Lyngby (Denmark)
  2. Technical University of Denmark, Department of Physics, Kgs. Lyngby (Denmark)
Publication Date:
OSTI Identifier:
22218135
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 8; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; DIMERS; ELECTRONS; ENERGY LOSSES; ENERGY-LOSS SPECTROSCOPY; MATERIALS; NANOSTRUCTURES; SILVER; SURFACES; TUNNEL EFFECT