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Letter

Nature Materials 7, 31–37 (1 January 2008) | doi:10.1038/nmat2072

Three-dimensional photonic metamaterials at optical frequencies

Na Liu , Hongcang Guo , Liwei Fu , Stefan Kaiser , Heinz Schweizer & Harald Giessen

Metamaterials are artificially structured media with unit cells much smaller than the wavelength of light. They have proved to possess novel electromagnetic properties, such as negative magnetic permeability and negative refractive index.