Maksymov, Ivan S.; Davoyan, Arthur R.; Kivshar, Yuri S.
We introduce a design of Yagi-Uda plasmonic nanoantennas for enhancing the
antenna gain and achieving control over the angular emission of light. We
demonstrate that tapering of antenna elements allows to decrease spacing
between the antenna elements tenfold also enhancing its emission directivity.
We find the optimal tapering angle that provides the maximum directivity
enhancement and the minimum end-fire beamwidth.
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