Two optical dipole antennas (ODA) models comprised of a pair of gold nanorods (PNRs) and a pair of gold nanoellipsoids (PNEs) are introduced in this paper. Their far-field directivities at 600 nm are carefully studied by FDTD method. We find the radiation pattern of ODA is analogous to that of dipole antenna but the side-lobes occur more easily and earlier as the total length of ODA increases owing to existing of localized surface plasmon (LSP). In this paper, we present an analysis and explore on the influence of LSP on radiation pattern of ODA. Our results hold a great promise for improving the performance of optical antennas for various applications.
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