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Keywords:

  • surface plasmon polaritons;
  • plasmonic bandgap engineering;
  • interference effects
Thumbnail image of graphical abstract

An ultrawide-band unidirectional surface plasmon polariton launcher is realized by combining plasmonic bandgap engineering and linear interference effects. This device performs excellently over a wavelength range from 690 to 900 nm, which is enlarged 210-fold compared with previous reports, together with a large average extinction ratio of 30 dB and an average launching efficiency ratio of 1.0.