A split-ring resonator (SRR) is a component part of a negative index metamaterial (NIM), also known as Double Negative metamaterials (DNG). They are also component parts of other types of metamaterial such as Single Negative metamaterial (SNG). SRR's are also used for research in Terahertz metamaterials, Acoustic metamaterials, and Metamaterial antennas. SRRs are a pair of concentric annular rings with splits in them at opposite ends. The rings are made of nonmagnetic metal like copper and have small gap between them.

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