Direct Characterization of Plasmonic Slot Waveguides and Nanocouplers

Andrei Andryieuski, Volodymyr Zenin, Radu Malureanu, Valentyn S. Volkov, Sergey I. Bozhevolnyi, Andrei V. Lavrinenko

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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
Issue number7
Pages (from-to)3925-3929
Publication statusPublished - 2014


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


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