Space-Wave Routing via Surface Waves Using a Metasurface System
  We introduce the concept of a metasurface system able to route space wave via surface waves. This concept may be used to laterally shift or modulate the beam width of scattered waves. We propose two corresponding synthesis techniques, one that is exact but leads to practically challenging material parameters and one that is approximate but leads to simpler material parameters. The concept is experimentally verified in an electromagnetic periscope. Additionally, we propose two other potential applications namely a beam expander and a multi-wave refractor. 
Karim Achouri and Christophe Caloz
physics.optics physics.class-ph