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WIKIPEDIA dictionary defined the so-called meta-materials as
artificial materials engineered to have properties that may not
be found in nature. They are assemblies of multiple individual
elements fashioned from conventional microscopic materials such
as metals or plastics, but usually arranged in pre-designed periodic
patterns. During the last two decades, many scientists in different
fields have donated a lot of effort to tailor the novel properties of
meta-materials, in particular the optical ones. For example, the
development of photonic crystals has given us an unprecedented
flexibility in designing both linear and nonlinear optical properties, in
terms of refractive index and dielectric permittivity, as a function of
wavelength, and for different directions and polarizations. [Ref.1]