Abstract
Metamaterials are designed to have structures that make available properties notfound in Nature. Their unique properties (such as negative index of refraction,n) can be extended from GHz all the way to optical frequencies. We review thescaling properties of metamaterials that have been fabricated and give negativen and negativepermeability, μ. It is found that most of the experimentally realized metamaterials haveλ/a between 2 (THz and optical region) and 12 (GHz region), whereλ is the operationwavelength and a is the size of the unit cell. The transmission losses for the experimental structures and the ratioλ/a for the simulated structures are presented. Finally, a comparison of the differentmetamaterial designs (fishnet, cut and/or continuous wires, and split-ring resonators andwires) is given.
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