Reversing Light: Negative Refraction

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Nonmagnetic nanocomposites for optical and infrared negative-refractive-index media (2005, background): “n components of the wavevector, k = ω/c with ω and c being the free-space angular frequency of the radiation, 3 and speed of light in a vacuum; the propagation constant ν is given by ν = 1− κ2 ǫkk2 , (2) and the parameter κ deﬁnes the mode structure in x direction. As it directly follows from Eq. (1”
A proof of superlensing in the quasistatic regime, and limitations of superlenses in this regime due to anomalous localized resonance (2005, background): “Since 1999 there has been a lot of work in designing and fabricating composite materials with an effective negative refractive index over a range of frequencies: see the review of Pendry & Smith (2004) and references therein.”
Metamaterials in the Terahertz Regime (2009, background): “Such materials have never been found in nature, because the negative bands of the permittivity and permeability are relatively narrow and stand well apart in the spectrum [ 13 ].”
Homogenization of metamaterials by field averaging (invited paper) (2006, methodology): “(7) represent the relationship of the microcopic, or local fields, to the macroscopic fields.”