Metasurfaces as optically thin composite layers can be modeled as electric and magnetic
surface current sheets flowing in the layer volume in the metasurface plane. In the most …

In this article, the basic principles and the main applications of Huygens' metasurfaces
(HMSs) are reviewed from microwaves to optics. In general, HMSs comprise a thin layer of …

Metasurfaces are ushering in an era of multifunctional control over optical wavefronts
realized with ultrathin planarized devices. Recent advances have been enabling …

Metasurfaces have been rapidly advancing our command over the many degrees of
freedom of light; however, so far, they have been mostly limited to manipulating light in free …

Metasurfaces are thin two-dimensional metamaterial layers that allow or inhibit the
propagation of electromagnetic waves in desired directions. For example, metasurfaces …

A double-layered Huygens' unit cell is proposed to design a broadband metasurface lens
(meta-lens) for 5G millimeter-wave antennas. The Huygens' unit cell consists of a pair of …

Huygens' metasurfaces are electrically thin devices which allow arbitrary field
transformations. Beam refraction is among the first demonstrations of realized metasurfaces …

We present detailed analytical modeling and in-depth investigation of wide-angle reflect-
mode metagrating beam splitters. These recently introduced ultrathin devices are capable of …

Recently, there has been growing interest in the use of metamaterial (MTM)-based lenses,
also known as metalenses, as innovative antenna technology. Increasingly widespread …

In this article, we review the topic of Huygens' metasurfaces with an emphasis on existing
and emerging applications at microwave frequencies. Huygens' metasurfaces have …