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Schematic drawing of the experimental setup, showing the path of the THz beam only. The two apertures are used to control the regions of excitation, propagation, and emission of SPPs.
Relative transmission through periodic structures of cylindrical rods showing Wood’s anomalies. The vertical lines represent the corresponding frequencies for . The spectra for different diameters are displaced vertically for clarity.
Experimentally observed splittings of Wood’s anomalies in absorption (upper part) and emission (lower part) for three different angles of incidence. The detection of the re-emitted THz pulses was started 2 ps after the excitation pulse.
Determination of propagation speed of SPPs excited at 600 GHz. The inset shows schematically the two apertures to change the excitation, propagation, and detection length on the structure.
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