Mitigating Snell's-Law reflection and transmission with metasurfaces of ordinary dielectrics

Abstract

-Obtaining anomalous reflection and transmission (namely propagation along directions different from those predicted by Snell's law) is investigated for plane waves impinging on a planar periodic metasurface composed of two dielectric layers. The associated boundary-value problem is treated by a rigorous entire-domain integral equation methodology. Optimizations with respect to the configuration's parameters are performed which reveal that it is possible to obtain significantly enhanced anomalous transmission and reflection depending on the color of the incident light. The optimal parameter values correspond to metasurfaces which can be easily realizable by low-loss dielectric materials.

Achieving Anomalous Refraction with Metasurfaces Composed by Two Ordinary Dielectric Materials

“…In [9] and [10], it was demonstrated that a gradient dielectric metasurface composed of two periodically alternating lossless materials can generate anomalous reflection phenomena in the visible frequency range; namely the power of the −1-reflected order is significantly enhanced while the corresponding powers of the 0-reflected and transmitted orders (dictated by Snell's law) are annihilated. The effective properties of the metasurface's unit cell offering these characteristics can be found in ordinary dielectrics.…”