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Dual-polarization wave-front manipulation with high-efficiency metasurface

In recent years, plentiful works have focused on anomalous reflections, but only few works achieved dual-polarized reflection with high efficiency. In this paper, we present a reflection-type metasurface based on a dual-layer metallic structure at microwave frequency. By designing various periods of metallic structures, the metasurface can achieve high-efficiency anomalous reflections with a wide deflected angle range for orthogonal linearly polarized plane waves (x and y). By arranging distinct periods of units, various scattering angles of the reflected beam are achieved in two orthogonal directions. Besides, there is little interference between x-polarization and y-polarization reflected waves. To realize the aforementioned functionality, a unit cell with a stacked strip structure is employed. Based on the specific elements, we propose and simulate four metasurface schemes. Two of them are fabricated and measured, the measured results of which show good agreement with simulations validating our design. The high performance potentially makes this work diverse and intriguing with applications such as focusing reflectors and holograms.