Polarization Split Lensing via Polarization and Phase Control with Metasurfaces at Visible Frequencies

under the trend of miniaturization and reduction of system complexity, conventional bulky photonic elements are expected to be replaced by new compact and multi-functional photonic elements. in this letter, we propose a birefringent dielectric metasurface (dm) that could provide both phase and polarization control at visible wavelength. within this platform, we successfully realize a multi-functional polarization split metalens. such a single metalens can perform the multiple functions of a polarizing resolve imaging system without additional optical elements. polarization properties of light are resolved, an arbitrarily polarized incident beam is split into two orthogonally polarized beams, in which the transverse magnetic (tm) component and the transverse electric (te) component are focused on the right and left side of the central axis, respectively. the metalens maintains diffraction-limited focal spots with high focusing efficiencies (above 80%). this multi-functional metalens may found potential applications in polarization-resolved imaging, spectroscopy, and on-chip optoelectronic devices.