A plasmonic multi-directional frequency splitter

Based on plasmonic metamaterials, we propose a plasmonic multi-directional frequency splitter with band-stop filters. Such a plasmonic splitter consists of three specially-designed metal gratings with finite thickness. Electromagnetic waves at the designed frequencies are confined and guided along the three grating structures and better isolation between different gratings is achieved with the band-stop filters. The experimental verification of the frequency splitter has been implemented in microwave frequencies with excellent agreements to full-wave simulations.