Saturation of the magnetic response of split-ring resonators at optical frequencies.

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Progress in superconducting metamaterials (2014, background): “For example, the enhanced loss in metamaterials approaching the plasmonic limit has imposed a severe limitation on visible wavelength metamaterials composed of noble metal metaatoms [12–15].”
Plasmonics: Fundamentals and Applications (2007, background): “Theoretical investigations have suggested that this leads to a saturation of the increase of ωLC with frequency for f > 100 THz (λ0 < 3 μm) [Zhou et al., 2005].”
Optical cloaking with metamaterials (2006, methodology): “Then with (8) and (9) we find the shape factor of the cylindrical cloak to be Rab = 0.”
Photonic Metamaterials: Magnetism at Optical Frequencies (2006, background): “tric environment and by the skin effect [9], which we have tacitly neglected in our simple reasoning.”
Chiral metamaterials: simulations and experiments (2009, background): “However, the scaling rule breaks down beyond 200 THz, due to the fact that metals cannot be considered as perfect conductors anymore [15].”