Valentine and Xiang developed a three-dimensional structure with this property based on a cascaded fishnet structure of silver and magnesium fluoride, and Donhee Ham's group achieved this property by taking a two-dimensional electron gas and cooling it so it undergoes kinetic inductance. One paper posited that a slab with this property would be able to focus all radiative and non-radiative Fourier components of a 2D image, creating a (*) superlens. This property was originally postulated in a paper by Veselago, and was realized using a bunch of square copper split ring resonators by Shelby, Smith, and Schultz. Materials with this property are sometimes called "left-handed", and materials with this property have permittivity and permeability less than zero. Pendry's "invisibility cloak" and many metamaterials notably possess, for 10 points, what property, in which
Valentine and Xiang developed a three-dimensional structure with this property based on a cascaded fishnet structure of silver and magnesium fluoride, and Donhee Ham's group achieved this property by taking a two-dimensional electron gas and cooling it so it undergoes kinetic inductance. One paper posited that a slab with this property would be able to focus all radiative and non-radiative Fourier components of a 2D image, creating a (*) superlens. This property was originally postulated in a paper by Veselago, and was realized using a bunch of square copper split ring resonators by Shelby, Smith, and Schultz. Materials with this property are sometimes called "left-handed", and materials with this property have permittivity and permeability less than zero. Pendry's "invisibility cloak" and many metamaterials notably possess, for 10 points, what property, in which a dimensionless quantity appearing in Snell's Law is less than zero?
Valentine and Xiang developed a three-dimensional structure with this property based on a cascaded fishnet structure of silver and magnesium fluoride, and Donhee Ham's group achieved this property by taking a two-dimensional electron gas and cooling it so it undergoes kinetic inductance.
negative index of refraction [prompt on “metamaterials”, accept left-handed before mention]