Ultra-thin Huygens' metasurface lens for efficient focusing of transmissive waves

Abstract

We present a single-layer metasurface for achieving nearly 2π phase control with nearly unity transmission. Such a control is achieved by utilizing spectrally overlapped electric and magnetic resonances of the scatterer made of metallic resonators on both sides of the substrate. By varying the position of these resonances with the geometrical parameters of the scatterer, an arbitrary phase control is achieved. The proposed scatterer is then utilized to demonstrate subwavelength focusing operation at 8.94 GHz. An overall transmission efficiency of 58% is evaluated numerically.