Numerical study on cylindrical corrugated Mimicking Surface Plasmons (MSPs) Terahertz (THz) transmission line with and without gradually changed geometric parameters was carried out by means of the finite element method.The results show that the gradual increased size of corrugates both in depth and width will help the confinement of the electromagnetic energy transmission on the surface of the wire

and the structure also has the function of concentration the propagation wave

which brings forth enhancement of the surface plasmon wave during its transmission along the wire.The obtained results will favor the applications of THz transmission

near-field imaging

spectroscopy and sensing.