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Metamaterials get visibility

New scientist has a nice article about the advances in the development of metamaterials with a negative refractive index. The group of Gunnar Dolling at the University of Karlsruhe (Germany), has demonstrated the effect at 780 nm by scaling down a structure developed originally for infrared wavelengths. They deposited a layer of silver on a glass sheet, covering this with a thin layer of nonconducting magnesium fluoride, followed by another silver layer, forming a sandwich 100 nm thick. Later they make an array of square holes through the sandwich to create a grid, getting this way a refractive index of -0,6.

posted by Goto @ 14:57