Three-dimensional optical metamaterial with a negative refractive index

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An optical cloak made of dielectrics. (2009, background): “However, even with the advances in optical metamaterial”
Fano-resonant metamaterials and their applications (2013, neutral): “Several three-dimensional metamaterials, including a negative index metamaterial [125] and a 3D chiral polarizer [126] have been recently fabricated, but the task of demonstrating 3D metamaterials exhibiting Fano resonances still appears challenging with the exception of lower (microwave)…”
Flexible polydimethylsiloxane/multi-walled carbon nanotubes membranous metacomposites with negative permittivity (2017, background): “erties, such as negative refraction index [1], reversed Doppler effect [2] and reversed Vavilov-Cherenkov effect [3], which have promising applications in the field of invisible cloak [4], perfect lens [5], wireless power transfer [6] and magnetic resonance imaging [7], etc.”
Metamaterials in the Terahertz Regime (2009, neutral): “The current trend of metamaterial research involves designing and fabricating nanostructures that are capable of manipulating electromagnetic waves at the visible frequency regime [15], [16], [41], [ 42 ].”