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Shaping light beams in the nanometer scale: A Yagi-Uda nanoantenna in the optical domain
Li, Jingjing Salandrino, Alessandro Engheta, Nader
Li, Jingjing
Salandrino, Alessandro
Engheta, Nader
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Abstract
A Yagi-Uda-like optical nanoantenna concept using resonant core-shell plasmonic particles as its “reflectors” and “directors” is studied numerically. Such particles when placed near an optical dipole source in a certain arrangement may exhibit large induced dipole moments, resulting in shaping the far-field radiation pattern, analogous to the far field of classical Yagi-Uda antennas in the microwave regime. The variation of the ratio of radii in concentric core-shell nanostructure is used to tailor the phase of the polarizabilities of the particles and, consequently, the antenna’s far-field pattern. The idea of a nanospectrum analyzer is also briefly proposed for molecular spectroscopy.
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2007-12-06
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American Physical Society
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Li, J., Salandrino, A., & Engheta, N. (2007). Shaping light beams in the nanometer scale: A Yagi-Uda nanoantenna in the optical domain. Physical Review B, 76(24), 245403.