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Title: Robustness of plasmonic angular momentum confinement in cross resonant optical antennas

Using a combination of photoemission electron microscopy and numerical simulations, we investigated the angular moment transfer in strongly enhanced optical near-fields of artificially fabricated optical antennas. The polarization dependence of the optical near-field enhancement has been measured in a maximum symmetric geometry, i.e., excitation by a normal incident planar wave. Finite-difference time-domain simulations for the realistic antenna geometries as determined by high-resolution electron microscopy reveal a very good agreement with experimental data. The agreement confirms that the geometrical asymmetries and inhomogeneities due to the nanoscale fabrication process preserve the circular polarization in the gap regions with strong near-field enhancement.
Authors:
; ; ; ; ;  [1] ; ; ;  [2]
  1. Institut für Physik, Johannes Gutenberg-Universität, Staudingerweg 7, D-55099 Mainz (Germany)
  2. Institut für Physik, Julius-Maximilians-Universität, Am Hubland, 97074 Würzburg (Germany)
Publication Date:
OSTI Identifier:
22483103
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 26; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANGULAR MOMENTUM; ANTENNAS; ASYMMETRY; COMPUTERIZED SIMULATION; ELECTRON MICROSCOPY; EXCITATION; FABRICATION; GEOMETRY; NANOSTRUCTURES; PHOTOEMISSION; POLARIZATION; RESOLUTION; SYMMETRY