Abstract
Surface plasmon polaritons (SPPs) on metal surfaces corrugated periodically with shallow grooves are theoretically investigated in terahertz (THz) frequency range. Different geometrics of the grooves are analyzed, and it is found that SPPs on the surface with the trapeziform grooves have the best field confinement. The influence of the absorption of metal at THz frequencies on the performance of spoof SPPs is also examined. It is shown that long propagation length and subwavelength field confinement are simultaneously available for SPPs on the structured surface with trapeziform grooves. Metal surfaces with such a structure may lead to a new design of devices for routing terahertz radiations.
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