Broadband Efficient Polarization‐Pure Airy Beam Generation Based on Three‐Layer Metasurface

Abstract

Herein, a polarization‐pure Airy beam generation strategy based on twisted layer structures, which is broadband with efficiency approaching the theoretical limit, is proposed. As demonstration, an Airy beam generator operating in the microwave regime is built with stacked three‐layer identical complementary split ring resonators (CSRRs) as the unit cell. By spatially arranging the orientation angle of the middle layer in each unit cell, linearly polarized incident waves can be converted to an Airy beam in cross‐polarization, whereas the unmodulated copolarized component is strongly suppressed in the transmitted field. The proposed Airy beam generation strategy along with the transmission amplitude and phase modulation method can be implemented at terahertz and even infrared regimes using various other twisted multilayer structures.