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A novel way to split terahertz (THz) surface waves is presented on the basis of propagation characteristics of spoof surface plasmon polaritons. Metal disc-type splitters with a centre hole and radially placed gratings are proposed and analysed using the finite-difference time-domain (FDTD) method in cylindrical co-ordinates. Numerical results demonstrate that the discs act as bi- and multi-directional THz surface wave splitters with large coupling regions, the frequency of which is selected by grating structures.
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S.A. Maier ,
S.R. Andrews ,
L. Martín-Moreno ,
F.J. García-Vidal
.
Terahertz surface plasmon-polariton propagation and focusing on periodically corrugated metal wires.
Phys. Rev. Lett.
http://iet.metastore.ingenta.com/content/journals/10.1049/el.2014.4331
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