Plasmonic lens

A plasmonic lens is an optical device that utilizes surface plasmons—coherent delocalized electron oscillations that occur at the interface between a conductor and a dielectric material—to focus light beyond the diffraction limit of conventional lenses. Unlike traditional lenses, which rely on refraction to focus light, plasmonic lenses exploit the unique properties of plasmonic materials (typically metals like gold or silver) to manipulate light at the nanoscale.