Planar metamaterial realization: From 3D metamaterial to 2D metasurface

As a paradigm for engineering electromagnetic space and controlling propagation of waves, metamaterials has inspired many novel physical mechanism and applications for the past decades. But bulky volume and non-negligible loss indeed restrict the applications in meta-devices, especially in microwave region. In this paper, our recent efforts in planar metasurface are reviewed with emphasis on (1) ultra-thin metasurface based on phase discontinuities and (2) low-loss electromagnetic induced transparency (EIT) metasurface. Our designs provide a promising approach to miniaturize, planarize and integrate multiple microwave components.