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Title: Spectral tunability of realistic plasmonic nanoantennas

Single nanoantenna spectroscopy was carried out on realistic dipole nanoantennas with various arm lengths and gap sizes fabricated by electron-beam lithography. A significant difference in resonance wavelength between realistic and ideal nanoantennas was found by comparing their spectral response. Consequently, the spectral tunability (96 nm) of the structures was significantly lower than that of simulated ideal nanoantennas. These observations, attributed to the nanofabrication process, are related to imperfections in the geometry, added metal adhesion layer, and shape modifications, which are analyzed in this work. Our results provide important information for the design of dipole nanoantennas clarifying the role of the structural modifications on the resonance spectra, as supported by calculations.
Authors:
; ;  [1] ; ; ;  [2] ; ;  [3]
  1. Department of Bioengineering, School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656 (Japan)
  2. Department of Electronic Chemistry, Tokyo Institute of Technology, Midori-ku, Yokohama, Kanagawa 226-8502 (Japan)
  3. Nanophotonics and Metrology Laboratory, Swiss Federal Institute of Technology Lausanne, Lausanne CH-1015 (Switzerland)
Publication Date:
OSTI Identifier:
22311006
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 9; 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; ADHESION; ANTENNAS; DEFECTS; DIPOLES; ELECTRON BEAMS; FABRICATION; LAYERS; METALS; MODIFICATIONS; NANOELECTRONICS; NANOSTRUCTURES; RESONANCE; SIMULATION; SPECTRA; SPECTROSCOPY; WAVELENGTHS