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In this work, we investigate the near-field properties of a tapered single wire waveguide, also known as a Sommerfeld-wire, for application in sub-wavelength terahertz near-field imaging. In reflection geometry, several waveguide terminations are investigated. Furthermore, to examine the imaging capability of a 20 mum radius taper tip, several metal structures were measured. Using a tapered Sommerfeld-wire,...
We present a photoconductive probe-tip applicable for near- and far-field measurements in the terahertz frequency range. The probe-tip is based on a triangular patch of freestanding LT-GaAs of only 1.3 mum thickness with a pair of tapered metallic wires on top. Using non-resonant electric field enhancement at the tip of the probing device a spatial resolution of 5 mum and a bandwidth of 2 THz is demonstrated.
We present results on THz near-field measurements of sub-wavelength single holes made in metal. Time and frequency dependence of the electric near-field of single sub-wavelength apertures are compared with the near-field predictions made by the well-known Bethe-Bouwkamp model.
An array of sub-wavelength circular apertures (d=60 mum), periodically distributed in a square lattice, was studied in the near field using Terahertz Time-Domain Spectroscopy (THz-TDS). Images of the complete electric field distribution (Emacrx,Emacry,Emacrz) were recorded over a subsection of the array, as well as the corresponding spectral information, with a spatial resolution Lt10 mum.
Optical scanning methods for characterizing radiation properties of THz photoconductive antenna arrays are proposed, and as an example, a fourteen element equally spaced array structure made on low temperature grown GaAs (LT-GaAs) is characterized using the proposed methods.
In this work, electric field dynamics of terahertz signals guided along straight and bended metallic slit waveguides are investigated. Metallic slit waveguides provide low-loss and non-dispersive signal propagation at THz frequencies. Here, spatiotemporal field mappings are employed to demonstrate highly confined and undistorted THz signal propagation in metallic slit waveguides. Low-loss propagation...
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