Imaging of terahertz surface plasmon waves excited on a gold surface by a focused beam.

  title={Imaging of terahertz surface plasmon waves excited on a gold surface by a focused beam.},
  author={Raimund Mueckstein and Oleg Mitrofanov},
  journal={Optics express},
  volume={19 4},
Surface plasmon polariton (SPP) waves formed near a tightly focused THz beam on a metallic surface are detected by an integrated sub-wavelength aperture THz near-field probe. The probe allows mapping the electric field pattern of the SPP wave and tracking the SPP propagation from the center of the focal spot. The SPP nature of the observed wave is confirmed by time-resolved measurements. Analysis of the detected patterns leads to an explanation of how THz SPP waves can be detected by the… 

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