Professor Eleftheriades is a recognized international authority and pioneer in the area of metamaterials. These are man-made media which have electromagnetic properties not found in nature. Professor Eleftheriades introduced a method for synthesizing metamaterials using loaded transmission lines. Together with his graduate students, he provided the first experimental evidence of imaging beyond the diffraction limit with a Veselago-Pendry lens and pioneered several novel microwave and optical components, and antennas using these transmission-line based metamaterials. By July 2012 his work has been cited more than 7,000 times.
His current research interests are in the areas of electromagnetic metamaterials, transformation optics, small antennas and components for broadband wireless communications, novel antenna beam-steering techniques, plasmonic and nanoscale optical components and fundamental electromagnetic theory.