Realization of entire-space electromagnetic wave manipulation with multifunctional metasurface

In this paper, we present a multifunctional metasurface (MS) to manipulate electromagnetic wave in the entire-space. First, we propose a MS unit structure which consists of four elaborately designed metal patterns separated by three substrate layers. Through changing the structures of metal layer 2 and layer 4, two different 1-bit units for transmission and reflection modes are obtained. By combining these two working modes together, the proposed MS can adjust the transmitted and reflected phases respectively in the upper and lower half-spaces. Thus we demonstrate some intriguing electromagnetic modulation functions in the entire-space, such as beam forming, anomalous reflection and diffusion. The simulated and experimental results prove that our method offers a feasible strategy for multifunctional MS design and other related practical applications.