Direct Characterization of Plasmonic Slot Waveguides and Nanocouplers

Andrei Andryieuski, Vladimir A. Zenin, Radu Malureanu, Valentyn S. Volkov, Sergey I. Bozhevolnyi, Andrei Lavrinenko

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Abstract

We demonstrate the use of amplitude- and phase-resolved near-field mapping for direct characterization of plasmonic slot waveguide mode propagation and excitation with nanocouplers in the telecom wavelength range. We measure mode’s propagation length, effective index and field distribution and directly evaluate the relative coupling efficiencies for various couplers configurations. We report 26- and 15-fold improvements in the coupling efficiency with two serially connected dipole and modified bow-tie antennas, respectively, as compared to that of the short-circuited waveguide termination.
Original languageEnglish
JournalNano letters
Volume14
Issue number7
Pages (from-to)3925–3929
ISSN1530-6984
DOIs
Publication statusPublished - 2014

Keywords

  • Nanocoupler
  • Surface plasmon
  • Slot waveguide
  • Nanoantenna
  • s-SNOM
  • Near-field microscopy

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