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Plasmonic nanoantennas are key elements in nanophotonics capable of directingradiation or enhancing the transition rate of a quantum emitter. Slot-typemagnetic-dipole nanoantennas, which are complementary structures of typicalelectric-dipole-type antennas, have received little attention, leaving theirantenna properties largely unexplored. Here we present a novelmagnetic-dipole-fed multi-slot optical Yagi-Uda antenna. By engineering therelative phase of the interacting surface plasmon polaritons between the slotelements, we demonstrate that the optical antenna exhibits highlyunidirectional radiation to free space. The unique features of the slot-basedmagnetic nanoantenna provide a new possibility of achieving integrated featuressuch as energy transfer from one waveguide to another by working as a futureoptical via.

Multi-slot optical Yagi-Uda antenna for efficient unidirectional radiation to free space