Time-domain measurements of surface plasmon polaritons in the terahertz frequency range

By J. Saxler, J. Gómez Rivas, C. Janke, H. Pellemans, P. Bolívar, H. Kurz. 2004

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Highly confined guiding of terahertz surface plasmon polaritons on structured metal surfaces (2008, background): “Such extended surface EM modes, known as Sommerfeld or Zenneck waves, have recently been studied at THz frequencie”
Review of Near-Field Terahertz Measurement Methods and Their Applications (2011, methodology): “These surface waves can be used, for example, to perform THz thin film spectroscopy [94, 95].”
Terahertz surface plasmonic waves: a review (2020, methodology): “Saxler et al.47 experimentally observed such an effect and found that a larger film thickness would lead to stronger field confinement, and meanwhile, higher frequencies had better field confinement than lower frequencies.”
Optical wafer defect inspection at the 10 nm technology node and beyond (2022, background): “The THz wave launched at a gap between a razor blade and the semiconductor surface is scattered at the gap and the scattered waves comprise a continuum of both propagating and evanescent fields [150, 163], which makes the excitation of SPPs possible.”
Plasmonics: Fundamentals and Applications (2007, background): “Furthermore, control of the phase of the re-emitted radiation allows selective suppression of transmission, as has been confirmed with suitable phase-gratings in the THz regime [Cao et al., 2005].”