Truly unidirectional excitation and propagation of diffractionless surface plasmon-polaritons

  title={Truly unidirectional excitation and propagation of diffractionless surface plasmon-polaritons},
  author={Seyyed Ali Hassani Gangaraj and George W. Hanson and M{\'a}rio G. Silveirinha and K. Shastri and Mauro Antezza and Francesco Monticone},
  journal={arXiv: Optics},
Light-matter interactions in conventional nanophotonic structures typically lack directionality. For example, different from microwave antenna systems, most optical emitters (excited atoms/molecules, quantum dots) exhibit quasi-isotropic dipolar radiation patterns with low directivity. Furthermore, surface waves supported by conventional material substrates do not usually have a preferential direction of propagation, and their wavefront tends to spread as it propagates along the surface, unless… 

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