The Design of Circular Polarization Dependent Dual Focusing Metalens

Abstract

Metalenses are the practical application of metasurfaces which are ultrathin and contain arrays of subwavelength optical antennas. Compared with conventional bulk lenses, the metalenses have a few micrometer-scale thicknesses and achieve the demand for the continuous miniaturization of optical components.

In this presentation, we introduce how to design the metalens which has dual focus depending on circular polarization of incident light (LCP or RCP) by utilizing geometric and propagation phases. We confirmed wave propagation by MATLAB simulation from the phase map and observed dual focal points from experimental measurment. This dual focusing metalens could be applied to sensing, imaging, and security platform.