Abstract
Plasmonic couplers with tunable direction and intensity ratio controlled by exciting optical vortex are proposed in this paper. The nanoscale structure is rather simple only composed of two thin parallel slits. By modulating topological charges and sizes of the exciting optical vortex, different coupling directions and various directional coupling ratios can be obtained with fixed structure. The proposed plasmonic structure is not only a controllable plasmonic coupler but also a topological charge detector which can determine the direction of phase twisting in a wide range. It is believed that the extremely compact structure can be potentially used in future logic photonic and plasmonic systems.
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