Open AccessTerahertz imaging of sub-wavelength particles with Zenneck surface waves
Author(s) -
Miguel Navarro–Cía,
Michele Natrella,
F. Dominec,
Jean-Christophe Delagnes,
P. Kužel,
Patrick Mounaix,
Chris Graham,
Cyril C. Renaud,
A.J. Seeds,
Oleg Mitrofanov
Publication year - 2013
Publication title -
applied physics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 442
eISSN - 1077-3118
pISSN - 0003-6951
DOI - 10.1063/1.4836195
Subject(s) - terahertz radiation , wavelength , materials science , surface wave , optics , dielectric , planar , antenna (radio) , excitation , strontium titanate , electromagnetic radiation , optoelectronics , physics , telecommunications , computer graphics (images) , quantum mechanics , computer science
International audienceImpact 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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