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Signal propagation distances within the scintillation fiber caused the two photodetectors to receive unequal portions of the signal. This letter proposes an ultracompact terahertz (THz) mode division multiplexer, which is structured around the concept of THz spoof surface plasmon polaritons (SPPs). The proposed mode multiplexer, unlike traditional optical multiplexing devices, allows for a smaller footprint by utilizing more variable parameters within the unit cell design, parti