Highly-efficient wavefront bending with a single-layer perforated metasurface

Abstract

Abstract Simultaneous control of transmission amplitude and phase in optical regime has been theoretically demonstrated, employing a single-layer metal film milled with rectangular grooves and holes that are orthogonal to each other. By designing the configuration and sizes of nano-apertures, a single outgoing polarization with field transmission coefficient of ∼0.8 and transmission phase shift covering the full 2π range can be achieved. Moreover, with the phase gradient along the surface of super-cells consisting of six sub-units, anomalous positive and negative refraction with a high efficiency (∼60%) was suggested. This perforated metasurface may provide an alternative and efficient platform for controlling light.