Terahertz imaging of sub-wavelength particles with Zenneck surface waves

Research output: Contribution to journalArticlepeer-review


  • M. Natrella
  • F. Dominec
  • J. C. Delagnes
  • P. Kužel
  • P. Mounaix
  • C. Graham
  • C. C. Renaud
  • A. J. Seeds
  • O. Mitrofanov

Colleges, School and Institutes

External organisations

  • UCL
  • Institute of Physics of the Academy of Sciences of the Czech Republic
  • LOMA, Bordeaux 1 University, CNRS UMR 5798


Impact of sub-wavelength-size dielectric particles on Zenneck surface waves on planar metallic antennas is investigated at terahertz (THz) frequencies with THz near-field probe microscopy. Perturbations of the surface waves show the particle presence, despite its sub-wavelength size. The experimental configuration, which utilizes excitation of surface waves at metallic edges, is suitable for THz imaging of dielectric sub-wavelength size objects. As a proof of concept, the effects of a small strontium titanate rectangular particle and a titanium dioxide sphere on the surface field of a bow-tie antenna are experimentally detected and verified using full-wave simulations.


Original languageEnglish
Article number221103
JournalApplied Physics Letters
Issue number22
Publication statusPublished - 25 Nov 2013

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