skip to main content

Title: Probing plasmonic breathing modes optically

The confinement of surface plasmon modes in flat nanoparticles gives rise to plasmonic breathing modes. With a vanishing net dipole moment, breathing modes do not radiate, i.e., they are optically dark. Having thus escaped optical detection, breathing modes were only recently revealed in silver nanodisks with electron energy loss spectroscopy in an electron microscope. We show that for disk diameters >200 nm, retardation induced by oblique optical illumination relaxes the optically dark character. This makes breathing modes and thus the full plasmonic mode spectrum accessible to optical spectroscopy. The experimental spectroscopy data are in excellent agreement with numerical simulations.
Authors:
; ; ; ; ; ;  [1]
  1. Institute of Physics, Karl-Franzens-University, Universitätsplatz 5, 8010 Graz (Austria)
Publication Date:
OSTI Identifier:
22310638
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 17; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; COMPUTERIZED SIMULATION; CONFINEMENT; DETECTION; DIPOLE MOMENTS; ELECTRON MICROSCOPES; ENERGY-LOSS SPECTROSCOPY; NANOPARTICLES; SILVER; SPECTRA; SURFACES