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A Yagi-Uda-like optical nanoantenna concept using resonant core-shellplasmonic particles as its "reflectors" and "directors" is studied numerically.Such particles when placed near an optical dipole source in a certainarrangement may exhibit large induced dipole moments, resulting in shaping thefar-field radiation pattern, analogous to the far field of classical Yagi-Udaantennas in the microwave regime. Variation of the ratio of radii in concentriccore-shell nanostructure is used to tailor the phase of the polarizabilities ofthe particles, and consequently the antenna's far-field pattern. The idea of ananospectrum analyzer is also briefly proposed for molecular spectroscopy.Comment: under revie

Shaping light beams in the nanometer scale: A Yagi-Uda nanoantenna in the optical domain