Split-ring resonator

An example split-ring resonator consisting of an inner square with a split on one side embedded in an outer square with a split on the other side. Split-ring resonators are on the front and right surfaces of the square grid, and single vertical wires are on the back and left surfaces.
Electric field (top) and magnetic field (bottom) of an electric-SRR under resonant electrical excitation. The magnetic response arises from the symmetry of the current loops.

A split-ring resonator (SRR) is an artificially produced structure common to metamaterials. Its purpose is to produce the desired magnetic susceptibility (magnetic response) in various types of metamaterials up to 200 terahertz.

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