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Laser-ionization of molecules is one of the most important processes in the strong-field and attosecond sciences. One of the key mechanisms governing molecular ionization is enhanced ionization, where for diatomic molecules the ionization probability becomes strongly enhanced at a critical internuclear distance [1, 2]. Experiments on polytatomic molecules have revealed remarkably high charge states...
We investigate the interaction of strong single-cycle THz pulses with a coherent excitonic population, observing the transition from Rabi flopping of the 1s-2p transition to multi THz-photon ionization with increasing field strength.
The glass transition temperature Tg of polymers is identified by terahertz (THz) time-domain spectroscopy (TDS). The THz refractive index n of the investigated material changes significantly in the region of the glass transition. Hence, THz TDS offers the possibility for non-contact polymer analysis.
In this conference paper, we propose asymmetric single split resonators, which feature a very high Q-factor and a small electrical size, as unit cells for terahertz frequency selective surface applications such as filters or thin-film sensors. To benchmark the performance of these resonators, we compare the proposed single split asymmetric structures to their double split counterparts with the same...
THz imaging holds a strong potential for applications such as industrial quality assurance. However, the slow scan speed still limits the broad market introduction. In this paper, we present three different approaches based on photoconductive antenna transmitters and receivers, which aim to increase the speed of THz time-domain imaging. Firstly, multi-channel measurements, with several transmitter...
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