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Negative reflection and negative surface wave conversion from obliquely incident electromagnetic waves
1  Southeast University


Based on Snell’s law, when electromagnetic waves are obliquely incident at an interface, reflected waves are in the opposite side of the incident waves with respect to the interface normal, which is called as normal reflection (or positive reflection). Here, we experimentally demonstrate negative reflection of electromagnetic waves that obliquely impinge on an anisotropic coding metasurface, in which the reflected and incident waves are in the same side of the surface normal. The anisotropic coding metasurface is composed of an array of ellipse-shaped coding particles, exhibiting powerful controls to electromagnetic waves with arbitrarily oblique incidence by adding compensation coding sequences to the original coding pattern. In addition to the negative reflections, the anisotropic coding metasurface also shows powerful abilities to convert the obliquely-incident spatial waves to surface waves with high efficiency. More importantly, two orthogonally polarized spatial waves are converted to two surface waves propagating in different directions, one of which is in the same side of the obliquely incident wave with respect to the surface normal, resulting in negative surface wave. Experimental results have good agreements to theoretical and numerical predictions for both negative reflections and negative surface waves.