Terahertz imaging of sub-wavelength particles with Zenneck surface waves

Abstract : 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.
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M. Navarra-Cia, M. Natrella, F. Dominec, Jean-Christophe Delagnes, P. Kuzel, et al.. Terahertz imaging of sub-wavelength particles with Zenneck surface waves. Applied Physics Letters, American Institute of Physics, 2013, 103 (22), pp.221103. ⟨10.1063/1.4836195⟩. ⟨hal-00910201⟩

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