High-Efficiency Generation of Airy Beams with Huygens’ Metasurface

Metasurfaces provide a compact scheme for generating Airy beams (which accelerate, bend, and do not diffract), but usually suffer from either lack of amplitude modulation or low transmission efficiency. To address these issues, this study proposes high-efficiency Huygens' meta-atoms that allow independent control of electric and magnetic responses, allowing nearly arbitrary transmission amplitude and phase. Hence the Airy-beam generators assembled from them present high transmission efficiency. This result can stimulate production of efficient devices for wave-front manipulation, with diverse functionalities in different frequency domains, including the terahertz.