A
split-ring resonator (SRR) is an artificially produced structure common to
metamaterials. Their purpose is to produce the desired
magnetic susceptibility (magnetic response) in various types of
metamaterials up to 200
terahertz. These media create the necessary strong magnetic coupling to an applied
electromagnetic field, not otherwise available in conventional materials. For example, an effect such as negative
permeability is produced with a periodic array of split ring resonators.