One exemplary metamaterial is formed from a plurality of individual unit cells, at least a portion of which have a different permeability than others. The plurality of individual unit cells are arranged to provide a metamaterial having a gradient index along at least one axis. Such metamaterials can be used to form lenses, for example.
STATEMENT OF GOVERNMENT INTEREST
This invention was made with Government support under DE-FG03-93ER40793 awarded by Department of Energy and under DMR-9623949 and DMR-9724535 awarded by National Science Foundation. The Government has certain rights in this invention.