Abstract-Impact of Antenna Design on the Electric-Field Direction Sensitivity of Zero-Biased Y–Ba–Cu–O Detectors to Ultra-Short THz Pulses

Alexander Schmid,  Artem Kuzmin  , Johannes L. Steinmann, Juliane Raasch,  Stefan Wuensch,  Konstantin Ilin, Anke-Susanne Müller, Michael Siegel,

https://ieeexplore.ieee.org/document/8645658

Detectors made from sub-micron-sized bridges of the high- Tc superconductor Y–Ba–Cu–O have unique properties useful for the detection of THz radiation, namely evidence of a detector response with an additional sensitivity to the direction of the electric field of short THz pulses when used without a transport current in the so-called “zero-bias” regime. In order to examine the influence of the antenna design on the detector response, we have conducted electromagnetic simulations and performed experiments at a synchrotron light source and with a photomixing setup as sources for short THz pulses. In this paper, we evaluate a narrow-band double-slot antenna as well as a broadband log-spiral antenna design

Abstract-Silicon-plasmonic integrated circuits for terahertz signal generation and coherent detection

Tobias Harter, Sascha Muehlbrandt, Sandeep Ummethala, Alexander Schmid, Lothar Hahn, Wolfgang Freude, Christian Koos

https://arxiv.org/abs/1802.08506

Optoelectronic signal processing offers great potential for generation and detection of ultra-broadband waveforms in the THz range, so-called T-waves. However, fabrication of the underlying high-speed photodiodes and photoconductors still relies on complex processes using dedicated III-V semiconductor substrates. This severely limits the application potential of current T-wave transmitters and receivers, in particular when it comes to highly integrated systems that combine photonic signal processing with optoelectronic conversion to THz frequencies. In this paper, we demonstrate that these limitations can be overcome by plasmonic internal photoemission detectors (PIPED). PIPED can be realized on the silicon photonic platform and hence allow to leverage the enormous opportunities of the associated device portfolio. In our experiments, we demonstrate both T-wave signal generation and coherent detection at frequencies of up to 1 THz. To proof the viability of our concept, we monolithically integrate a PIPED transmitter and a PIPED receiver on a common silicon photonic chip and use them for measuring the complex transfer impedance of an integrated T-wave device.