Simulation investigation on channel surface plasmon guiding by terahertz wave through subwavelength metal V-groove

The waveguide propagation properties of terahertz wave through subwavelength metallic triangular groove channels have been simulationally investigated. The effects of groove depth, groove angle and dielectric filling materials on propagation property have been shown and discussed. The results show that with increasing of groove depth and angle degree the propagation constant of channel surface plasmon polariton mode decreases. The propagation constant of poor conductive metal is larger than that of good conductive metal, which may result from the fact that the former has larger skin depth. In addition, the confinement of CSPP mode could be improved by increasing the refractive index of dielectric filling materials.