157 citations · 905 across the 25 of their papers we have counts for
25 papers
Terahertz resonant emission by optically excited infrared-active shear phonons in KY(MoO4)2
D. Kamenskyi, K. Vasin, L. Prodan +4
Generation of the monochromatic electromagnetic radiation in the terahertz (THz) range of frequencies for many decades remanes a chellenging task. Here we demonstrate the emission…
A 3.5-THz, x6-Harmonic, Single-Ended Schottky Diode Mixer for Frequency Stabilization of Quantum-Cascade Lasers
Divya Jayasankar, Vladimir Drakinskiy, Nick Rothbart +8
Efficient and compact frequency converters are essential for frequency stabilization of terahertz sources. In this paper, we present a 3.5-THz, x6-harmonic, integrated Schottky dio…
Magnetoconductance and photoresponse properties of disordered NbTiN films
M. Sidorova, A. Semenov, H. -W. Huebers +4
We report on the study of phonon properties and electron-phonon coupling in thin NbTiN films, which are intensively exploited in superconducting devices. Studied NbTiN films with t…
Evaluation of Low-Cost Thermal Laser Stimulation for Data Extraction and Key Readout
Thilo Krachenfels, Heiko Lohrke, Jean-Pierre Seifert +3
Recent attacks using thermal laser stimulation (TLS) have shown that it is possible to extract cryptographic keys from the battery-backed memory on state-of-the-art field-programma…
Electron energy relaxation in disordered superconducting NbN films
Mariia Sidorova, Alexej Semenov, Heinz-Wilhelm Hübers +8
We report on the inelastic-scattering rate of electrons on phonons and relaxation of electron energy studied by means of magnetoconductance, and photoresponse, respectively, in a s…
Terahertz dynamic aperture imaging at stand-off distances using a Compressed Sensing protocol
Sven Augustin, Peter Jung, Sven Frohmann +1
In this text, results of a 0.35 terahertz (THz) dynamic aperture imaging approach are presented. The experiments use an optical modulation approach and a single pixel detector at a…
The upGREAT dual frequency heterodyne arrays for SOFIA
C. Risacher, R. Güsten, J. Stutzk +30
We present the performance of the upGREAT heterodyne array receivers on the SOFIA telescope after several years of operations. This instrument is a multi-pixel high resolution (R >…
Mask Responses for Single-Pixel Terahertz Imaging
Sven Augustin, Sven Frohmann, Peter Jung +1
Terahertz (THz) radiation meaning electromagnetic radiation in the range from 0.1 THz (3 mm) to 10 THz (30 mu) has the unique advantage of easily penetrating many obstructions whil…
Characteristics of superconducting tungsten silicide WxSi1-x for single photon detection
X. Zhang, A. Engel, Q. Wang +7
Superconducting properties of three series of amorphous WxSi1-x films with different thickness and stoichiometry were investigated by dc transport measurements in a magnetic field…
Far-infrared study of tracers of oxygen chemistry in diffuse clouds
H. Wiesemeyer, R. Güsten, S. Heyminck +8
Context. The chemistry of the diffuse interstellar medium rests upon three pillars: exothermic ion-neutral reactions (" cold chemistry "), endothermic neutral-neutral reactions wit…
Spectroscopically resolved far-IR observations of the massive star-forming region G5.89--0.39
S. Leurini, F. Wyrowski, H. Wiesemeyer +9
The fine-structure line of [OI] at 63micron is an important diagnostic tool in different fields of astrophysics. However, our knowledge of this line relies on observations with low…
Asymmetry in the effect of magnetic field on photon detection and dark counts in bended nanostrips
A. Semenov, I. Charaev, R. Lusche +6
Current crowding in the bends of superconducting nano-structures not only restricts measurable critical current in such structures but also redistributes local probabilities for da…
Granular Structure Determined by Terahertz Scattering
Philip Born, Nick Rothbart, Matthias Sperl +1
Light-scattering in the terahertz region is demonstrated for granular matter. A quantum-cascade laser is used in a benchtop setup to determine the angle-dependent scattering of sph…
Effect of the wire width on the intrinsic detection efficiency of superconducting-nanowire single-photon detectors
R. Lusche, A. Semenov, H. -W. Huebers +7
Thorough spectral study of the intrinsic single-photon detection efficiency in superconducting TaN and NbN nanowires with different widths shows that the experimental cut-off in th…
Highly responsive Y-Ba-Cu-O thin film THz detectors with picosecond time resolution
P. Thoma, J. Raasch, A. Scheuring +11
High-temperature superconducting YBa2Cu3O7-d (YBCO) thin-film detectors with improved responsivities were developed for fast time-domain measurements in the THz frequency range. YB…
Temperature-dependence of detection efficiency in NbN and TaN SNSPD
Andreas Engel, Kevin Inderbitzin, Andreas Schilling +7
We present systematic measurements of the temperature-dependence of detection efficiencies in TaN and NbN superconducting nanowire single-photon detectors. We have observed a clear…
Break-up of long-range coherence due to phase fluctuations in ultrathin superconducting NbN films
Y. Noat, T. Cren, C. Brun +7
Using scanning tunneling spectroscopy (STS), we address the problem of the superconductor-insulator phase transition (SIT) in homogeneously disordered ultrathin (2-15 nm) films of…
Non-thermal response of YBCO thin films to picosecond THz pulses
P. Probst, A. Semenov, M. Ries +16
The photoresponse of YBa2Cu3O7-d thin film microbridges with thicknesses between 15 and 50 nm was studied in the optical and terahertz frequency range. The voltage transients in re…
[CII] gas in IC 342
M. Röllig, R. Simon, R. Güsten +6
Methods: We used the dual-band receiver GREAT on board the SOFIA airborne telescope to perform observations of the [C II] 158 μm fine-structure line at the postitions of two giant…
Detection of OD towards the low-mass protostar IRAS16293-2422
B. Parise, F. Du, F. -C. Liu +6
Although water is an essential and widespread molecule in star-forming regions, its chemical formation pathways are still not very well constrained. Observing the level of deuteriu…
Probing MHD Shocks with high-J CO observations: W28F
A. Gusdorf, S. Anderl, R. Guesten +5
Context. Observing supernova remnants (SNRs) and modelling the shocks they are associated with is the best way to quantify the energy SNRs re-distribute back into the Interstellar…
[12CII] and [13CII] 158 mum emission from NGC 2024: Large column densities of ionized carbon
U. U. Graf, R. Simon, J. Stutzki +6
Context: We analyze the NGC 2024 HII region and molecular cloud interface using [12CII] and [13CII] observations. Aims: We attempt to gain insight into the physical structure of th…
Dynamics and PDR properties in IC1396A
Yoko Okada, Rolf Güsten, Miguel Angel Requena-Torres +7
We investigate the gas dynamics and the physical properties of photodissociation regions (PDRs) in IC1396A, which is an illuminated bright-rimmed globule with internal structures c…
Fluctuation effects in superconducting nanostrips
A. Engel, A. D. Semenov, H. -W. Huebers +2
Superconducting fluctuations in long and narrow strips made from ultrathin NbN films, have been investigated. For large bias currents close to the critical current fluctuations led…