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Keywords:

  • optical circuitry;
  • phase engineering;
  • plasmonic devices;
  • waveguide launchers;
  • SNOM
Thumbnail image of graphical abstract

Ultrasmall couplers for the excitation of plasmonic structures by photonic modes are presented. They are constructed by assembling point-like resonators in the near-field zone of the target structure. As a demonstration of its efficacy, this scheme is applied to unidirectional excitation of plasmonic waveguides. The overall footprint of the resulting coupling structures is less than λ2/10.