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Goos–Hänchen shift in metallic gratings assisted by phase gradient metasurfaces

In this paper, we propose to achieve Goos–Hänchen (GH) shift inside metallic gratings that are printed on dielectric substrate with metallic backing. A phase gradient metasurface (PGM) is integrated inside one end of the metallic gratings(MG). Modulated by the phase gradient, normally incident EM waves upon the PGM can be deflected by large angles with respect to the normal and then confined in between the gratings and the metallic backing, forming an effective waveguide. When EM waves in the waveguide hit upon the gratings, considerable lateral shift occurs. As an example, we designed, fabricated and measured a prototype in X band. Surface waves can be excited onside the gratings in 8.8–9.2 GHz and total internal reflection (TIR) occurs beneath the gratings in 9.2–9.6 GHz. Owing to the destructive interference between evanescent waves derived from TIR and surface waves excited onside the gratings, GH-shift can be observed in 9.2–9.6 GHz. Due to low profile, the configuration provides a compact alternative to excitation of GH-shift effect.