Abstract
Free control of electromagnetic wave fronts remains a key issue in photonics. Traditional wave-shaping elements, used for centuries, suffer from limited functionalities and excessive size. Now metasurfaces offer exotic abilities to reshape the wave front of light, but are mainly used to manipulate propagating waves. Extending the idea of metasurfaces for propagating waves to surface waves (SWs), the authors create a gradient metawall that yields focusing effects and high-efficiency reflection per a generalized Snell's Law for SWs. This development may inspire applications such as SW holograms, superresolution imaging, and enhanced nonlinear optical effects.
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