All-dielectric Cylindrical Homogenized Metasurface for Enhanced Directional Scattering

Metasurfaces (MSs) are flat functional structures enabling advanced wave manipulations such as perfect absorption, cloaking, and lasing, to mention a few [1-3]. At optical frequencies, all-dielectric MSs are more
favored over the metallic kinds coming from to their low loss. MSs consist of periodic unit cells which are often arranged in rectangular planes. However, MSs can also take up cylindrical and spherical forms. In recent years, it has been shown that cylindrical MSs can be used for scattering suppression and enhancement [4]. These scattering properties are achieved from the resonances excited in the cavities that the MSs form. Although the underlying theory for cylindrical MSs applies across the electromagnetic spectrum, its primary utilization has been at microwave frequencies. This preference is due to the treatment of the MSs as homogenized surface impedances as well as the lack of analytical models for all-dielectric versions of these.