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Although a rigorous theoretical ground on metasurfaces has been establishedin the recent years on the basis of the equivalence principle, the majority ofmetasurfaces for converting a propagating wave into a surface wave aredeveloped in accordance with the so-called generalized Snell's law being asimple heuristic rule for performing wave transformations. Recently, for thefirst time, Tcvetkova et al. [Phys. Rev. B 97, 115447 (2018)] have rigorouslystudied this problem by means of a reflecting anisotropic metasurface, whichis, unfortunately, difficult to realize, and no experimental results areavailable. In this paper, we propose an alternative practical design of ametasurface-based converter by separating the incident plane wave and thesurface wave in different half-spaces. It allows one to preserve thepolarization of the incident wave and substitute the anisotropic metasurface byan omega-bianisotropic one. The problem is approached from two sides: Bydirectly solving the corresponding boundary problem and by considering the``time-reversed'' scenario when a surface wave is converted into a nonuniformplane wave. We develop a practical three-layer metasurface based on aconventional printed circuit board technology to mimic the omega-bianisotropicresponse. The metasurface incorporates metallic walls to avoid coupling betweenadjacent unit cells and accelerate the design procedure. The design isvalidated with full-wave three-dimensional numerical simulations anddemonstrates high conversion efficiency.

Omega-bianisotropic metasurface for converting a propagating wave into a surface wave