Revolutionary ultra-thin 'meta-lens' enables full-color imaging

Columbia Engineers have created the first flat lens capable of correctly focusing a large range of colors of any polarization to the same focal spot without the need for any additional elements. Only a micron thick, their revolutionary 'flat' lens is much thinner than a sheet of paper and offers performance comparable to top-of-the-line compound lens systems. UPenn nanophotonics expert Nader Engheta, who was not involved with this study, notes: "This...is an exciting development in the field of flat optics."