Multifunctional Terahertz Spoof Plasmonic Devices

摘要

The next-generation wireless communications and intrachip and interchip communications require high-speed terahertz (THz) interconnects. The interconnects based on spoof surface plasmon polaritons (SSPPs) provide a possible route to achieve this goal. Recently, some THz plasmonic devices are explored, but they suffer from bulk sizes and/or single function. Here, planar multifunctional THz plasmonic devices based on the interaction between SSPPs and spoof localized surface plasmon (SLSPs) including the functions of pass-through transmission, multifrequency resonances, and phase shift are proposed and experimentally demonstrated. The pass-through transmission can be realized on the SSPP waveguide by increasing the loss of the coupled SLSP resonator; the multifrequency resonances are obtained by placing the SU-8 films with different thicknesses on the SLSP resonator due to its high sensitivity; and the phase shift can be achieved by integrating the SU-8 film on the SSPP waveguide due to the flexible dispersion behaviors of SSPPs. The proposed multifunctional THz plasmonic devices hold great promise for the THz on-chip integrations, wireless communications, and sensing systems.

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