Mode-matching metasurfaces: coherent reconstruction and multiplexing of   surface waves
  Metasurfaces are promising two-dimensional metamaterials that are engineered to provide unique properties or functionalities absent in naturally occurring homogeneous surfaces. Here, we report a type of metasurface for tailored reconstruction of surface plasmon waves from light. The design is generic in a way that one can selectively generate different surface plasmon waves through simple variation of the wavelength or the polarization state of incident light. The ultra-thin metasurface demonstrated in this paper provides a versatile interface between the conventional free-space optics and a two-dimensional platform such as surface plasmonics. 
Jiao Lin, Qian Wang, Guanghui Yuan, Luping Du, Shan Shan Kou,   Xiao-Cong Yuan
physics.optics