Plasmonic waveguide coupling at terahertz frequencies

Two approaches for coupling terahertz radiation to surface plasmonic waveguides are proposed and simulated. The first approach utilizes a rectangular waveguide with a tapered plasmonic feed, which allows for the gradual confinement of terahertz waves into a plasmonic structure. The second method employs a ribbon dielectric waveguide, which edge couples terahertz radiation onto a surface plasmonic structure. Coupling designs are presented along with simulation results.