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We will present our theoretical results on the optical properties of metallo-dielectric core-shell nanospheres and the possibility to use them as building blocks for three-dimensional, isotropic, optical metamaterials. In particular, it will be shown that, carefully choosing the geometrical parameters, it is possible to spectrally overlap a strong dipolar magnetic Mie resonance from a high-permittivity dielectric shell, and a localized surface plasmon resonance (LSPR) of a noble metal core. Since the strong electric and magnetic responses stem from every single meta-atom, no particular arrangement is needed. Moreover, the metamaterial proposal is isotropic and polarization insensible. Realistic configurations with Silver in the core and a semiconductor in the shell (Silicon or Germanium) will be demostrated to operate in the near-infrared (1.2-1.55 microns).

metamaterials; plasmonics; nanophotonics