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Here we demonstrate the experimental results on inhouse fabricated polymer THz porous fiber with sub-wavelength features. The experimental results confirm the theoretical prediction of low dispersion characteristics in a THz porous fiber as compared to a microwire. Refereed/Peer-reviewed

Photoconductive aperture antenna arrays are used in THz time domain systems as the transmitter and the receiver elements, and the radiation properties of the antennas are characterized in terms of the applied dc bias and the optical excitation power.

A waveguide coupler configuration enabling the investigation of streaming liquids at terahertz frequencies is presented. The device is based on two electromagnetically coupled hollow core dielectric waveguides. One waveguide is air-filled and is used for terahertz signal transmission while the second waveguide is filled with the sample liquid. Experimental data supported by numerical field simulations are presented for an air-, water- and isopropanol-filled waveguide in the 0.2–0.8 THz frequency range.

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 μm 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 μm and a bandwidth of 2 THz is demonstrated.

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 20μm radius taper tip, several metal structures were measured. Using a tapered Sommerfeld wire, it was possible to resolve features corresponding to λ/50 at 0.3 THz.