A left-handed metamaterial is composed of meta-atoms with copper structures. (IMAGE)
Caption
The copper itself can only show a strong reflection when a light beam is incident onto it. However, once the copper is made into wire and split-ring resonators (SRRs), which respectively have negative permittivity and permeability values, the composed metamaterial exhibits negative refraction, which is a phenomenon that does not exist in nature.
Credit
Jingbo Sun
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