Perfect Anomalous Reflection with an Aggressively Discretized Huygens' Metasurface

Abstract

This paper investigates the discretization of a periodic metasurface and demonstrates how such a surface can achieve perfect anomalous reflection. Whilst most contemporary theoretical works on metasurfaces deal with continuous current or impedance distributions, we examine how discretization affects a metasurface, and show that in some cases one can discretize a metasurface aggressively --- to the extent of having only two cells per spatial period. Such aggressive discretization can lead to great simplifications in metasurface design, and perhaps more surprisingly, a possible performance improvement from continuous metasurfaces. Using this aggressive discretization technique, we report the design of a binary Huygens' metasurface which reflects an incident plane wave at 50${}^{\circ }$ into a reflected direction of -22.5${}^{\circ }$. Full-wave electromagnetic simulation shows the achievement of anomalous reflection with a power efficiency of 99.1%, which dramatically surpasses the performance of a corresponding passive continuous metasurface, for which the power efficiency is fundamentally limited to 69.6%.

3 pages, 3 figures

References in corpus (2)

• Perfect control of reflection and refraction using spatially dispersive metasurfaces
• Synthesis of passive lossless metasurfaces using auxiliary fields for reflectionless beam splitting and perfect reflection

Cited by in corpus (1)

• Arbitrary beam control using passive lossless metasurfaces enabled by orthogonally-polarized custom surface waves