Terahertz imaging of sub-wavelength particles with Zenneck surface waves

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 experimenta...

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Veröffentlicht in:Applied physics letters 2013-11, Vol.103 (22)
Hauptverfasser: Navarro-Cía, M., Natrella, M., Dominec, F., Delagnes, J. C., Kužel, P., Mounaix, P., Graham, C., Renaud, C. C., Seeds, A. J., Mitrofanov, O.
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Sprache:eng
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Zusammenfassung: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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4836195