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In this paper, we utilize coupled mode theory (CMT) to model the coupling ofsurface plasmon polaritons (SPPs) between tri-layered corrugated thin films(CTF) structure coupler in the terahertz region. Employing the stimulated ramanadiabatic passage (STIRAP) quantum control technique, we propose a noveldirectional coupler based on SPPs evolution in tri-layered CTF in some curvedconfiguration. Our calculated results show that the SPPs can be completelytransferred from the input to the output CTF waveguides, and even we considerSPPs propagation loss, the transfer rate is still above 70%. The performance ofour coupler is also robust that it is not sensitive to the geometry of deviceand wavelength of SPPs. As a result, our device can tolerate defect induced byfabrication and manipulate THz wave at broadband.

Adiabatic following of terahertz surface plasmon-polaritons based on tri-layered corrugated thin film coupler