Elpub

The experiments with gamma radiation carried out by Pound et al. in the 1960s make use of the Mőssbauer effect. The counting rate of photons emitted from a height of h=22.5 m from a Fe57 source was measured versus the downward speed of the absorber. It was found that the minimum transmission occurred…

The trajectory of light as it passes by the sun is computed by making use of a method introduced by Schiff in 1960. A key assumption thereby is that the light always travels in a straight line with a locally observed speed of c. The fact that the speed of light decreases as the gravitational potential…

Zugriff nur im Hochschulnetz der Universität Wuppertal und für autorisierte Benutzer.

Silicon lenses are widely employed to turn a terahertz (THz) focal-plane array into a THz camera. For the first time, we have identified the type of radial distortion caused by such lenses. To this end, we measured all single-pixel far-field radiation patterns of a 15-mm diameter 2.75-mm extended hemispherical…

The objective of this study is to show the potential of amorphous indium gallium zinc oxide (a-IGZO) thin film transistors (TFT) for designing RF communication systems operating in the GHz regime. For that purpose, the self-mixing operation of in-house fabricated IGZO-TFTs beyond their transit frequency…

This paper presents the concept of a lens-integrated CMOS camera-type terahertz (THz) compact antenna test range (CATR) to determine the far-field characteristics of transmitters (TX), including the radiation pattern, directivity, half-power beamwidth (HPBW), and radiation power. For concept validation,…

The performance of terahertz (THz) dispersive spectroscopes is limited in spectral resolution and frequency accuracy due to a finite pixel count. This paper demonstrates that increasing the synthetic effective pixel count by exploiting super-resolution (SR) imaging results in improved performance. To…