Terahertz imaging of sub-wavelength particles with Zenneck surface waves

Navarro-Cía, M.; Natrella, M.; Dominec, F.; Delagnes, J. C.; Kuzˇel, P.; Mounaix, P.; Graham, C.; Renaud, C. C.; Seeds, A. J.; Mitrofanov, O.
November 2013
Applied Physics Letters;11/25/2013, Vol. 103 Issue 22, p221103
Academic Journal
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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