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Mitarbeiter Hofherr

Dr.-Ing. Matthias Hofherr

Wissenschaftlicher Mitarbeiter
Raum: 107
Tel.: +49 721 608-44994
Fax: +49 721 75 79 25

Institut für Mikro- und Nanoelektronische Systeme (IMS)
Hertzstraße 16
Gebäude: 06.41
D - 76187 Karlsruhe


Abgeschlossene Studien-, Bachelor-, Diplom- und Masterarbeiten
Titel Forschungsthema Betreuer Bearbeiter
Schaltungsdesign

Ferdinand Schwenk

Schaltungsdesign

Robert Korn

Schaltungsdesign

Marco Neber

Schaltungsdesign

Dorjan Sulaj

Schaltungsdesign

Hanna Becker

Schaltungsdesign

Constantin Becker

Detektoren

Benjamin Berg

Detektoren

Matthias Arndt

Detektoren

Alexei Witzig

Schaltungsdesign

Bao An

Detektoren

Pavol Marko

Detektoren

Ferdinand Schwenk

THz-Sensorik

Robert Prinz

Detektoren

Valentin Ndasse

Detektoren

Leo Goslich

Detektoren

Julia Toussaint

Detektoren

Jörg Schaaf

Detektoren

Matthias Arndt

Detektoren

Markus Ditlevsen



Veröffentlichungen

I. Veröffentlichungen in referierten Zeitschriften

E. Roussel, C. Evain, C. Szwaj, S. Bielawski, J. Raasch, P. Thoma, A. Scheuring, M. Hofherr, K. Ilin, S. Wünsch, M. Siegel, M. Hosaka, N. Yamamoto, Y. Takashima, H. Zen, T. Konomi, M. Adachi, S. Kimura, and M. Katoh
Microbunching Instability in Relativistic Electron Bunches: Direct Observations of the Microstructures Using Ultrafast YBCO Detectors
Phys. Rev. Lett. 113, 094801, 2014
DOI: 10.1103/PhysRevLett.113.094801

M. Caselle, M. Balzer, S. Chilingaryan, M. Hofherr, V. Judin, A. Kopmann, N.J. Smale, P. Thoma, S. Wuensch, A.-S. Müller, M. Siegel and M. Weber
"An ultra-fast data acquisition system for coherent synchrotron radiation with terahertz detectors"
IOPscience, Journal of Instrumentation 9 C01024, 2014
DOI:10.1088/1748-0221/9/01/C01024

Petra Thoma, Juliane Raasch, Alexander Scheuring, Matthias Hofherr, Konstantin Il’in, Stefan Wünsch, Alexei Semenov, Heinz-Wilhelm Hübers, Vitali Judin, Anke-Susanne Müller, Nigel Smale, Jens Hänisch, Bernhard Holzapfel and Michael Siegel
"Highly Responsive Y-Ba-Cu-O Thin Film THz Detectors With Picosecond Time Resolution"
IEEE Transactions on Applied Superconductivity, 2013
DOI: 10.1109/TASC.2012.2233851

L. Rehm, D. Henrich, M. Hofherr, S. Wuensch, P. Thoma, A. Scheuring, K.  Il'in, M. Siegel, S. Haindl, K. Iida, F. Kurth, B. Holzapfel, L. Schultz
"Infrared Photo-Response of Fe-Shunted Ba-122 Thin Film Microstructures"
Applied Superconductivity, IEEE Transactions on, 2013, PP
DOI: 10.1109/TASC.2013.2244632

S. Engert, O. Wetzstein, M. Hofherr, K. Ilin, M. Siegel, H.-G. Meyer, H. Toepfer
"Mathematical Analysis of Multiplexing Techniques for SNSPD Arrays"
Applied Superconductivity, IEEE Transactions on, 2013, PP
DOI 10.1109/TASC.2013.2247455

M. Hofherr, M. Arndt, K. Il'in, D. Henrich, M. Siegel, J. Toussaint, T. May, H.-G. Meyer
"Time-Tagged Multiplexing of Serially Biased Superconducting Single-Photon Detectors"
Applied Superconductivity, IEEE Transactions on, PP, 99
DOI: 10.1109/TASC.2013.2245935

Matthias Hofherr, Olaf Wetzstein, Sonja Engert, Thomas Ortlepp, Benjamin Berg, Konstantin Ilin, Dagmar Henrich, Ronny Stolz, Hannes Toepfer, Hans-Georg Meyer and Michael Siegel
“Orthogonal sequencing multiplexer for superconducting nanowire single-photon detectors with RSFQ electronics readout circuit”
Opt. Express, OSA, 2012, 20, 28683-28697
DOI: 10.1364/OE.20.028683

Julia Toussaint, Roman Grüner, Marco Schubert, Torsten May, Hans-Georg Meyer, Benjamin Dietzek, Jürgen Popp, Matthias Hofherr, Matthias Arndt, Dagmar Henrich, Konstantin Il’in and Michael Siegel
"Superconducting single-photon counting system for optical experiments requiring time-resolution in the picosecond range"
AIP, Rev. Sci. Instrum. 83, 123103, 2012
DOI: 10.1063/1.4769048

D. Henrich, S. Dörner, M. Hofherr, K. Il’in, A. Semenov, E. Heintze, M. Scheffler, M. Dressel, M. Siegel
"Broadening of hot-spot response spectrum of superconducting NbN nanowire single-photon detector with reduced nitrogen content"
Journal of Applied Physics, 1112, 047511, 2012
DOI: 10.1063/1.4757625

P. Thoma, A. Scheuring, M. Hofherr, S. Wünsch, K. Il’in, N. Smale, V. Judin, N. Hiller, A.-S. Müller, A. Semenov, H.-W. Hübers, M. Siegel
"Real-time measurements of picosecond THz pulses by an ultra-fast YBa2Cu3O7-d detection system"
Appl. Phys. Lett. 101, 142601, 2012
DOI: 10.1063/1.4756905

Torsten May, Julia Toussaint, Roman Gruener, Marco Schubert, Hans-Georg Meyer, Benjamin Dietzek, Juergen Popp, Matthias Hofherr, Konstantin Il’in, Dagmar Henrich, Matthias Arndt, Michael Siegel
"Superconducting Nanowire Single-Photon Detectors for Picosecond Time Resolved Spectroscopic Applications"
Proc. of SPIE vol. 8427, 84274B, 2012

D. Henrich, P. Reichensperger, M. Hofherr, J. M. Meckbach, K. Il'in, M. Siegel, A. Semenov, A. Zotova, and D. Yu. Vodolazov
"Geometry-induced reduction of the critical current in superconducting nanowires"
Phys. Rev. B 86, 144504 (2012)
DOI: 10.1103/PhysRevB.86.144504

K. Il’in, M. Hofherr, D. Rall, M. Siegel, A. Semenov, A. Engel, K. Inderbitzin, A. Aeschbacher, A. Schilling
"Ultra-thin TaN Films for Superconducting Nanowire Single-Photon Detectors"
Journal of Low Temperature Physics (2012) 167:809–814
DOI: 10.1007/s10909-011-0424-3

P. Probst, A. Scheuring, M. Hofherr, S. Wünsch, K. Ilin, A. Semenov, H.-W. Hübers, V. Judin, A.-S. Müller, J. Hänisch, B. Holzapfel, M. Siegel
"Superconducting YBa2Cu3O7-delta Thin Film Detectors for Picosecond THz Pulses"
Journal of Low Temperature Physics, 167 (5), 898-903, (2012) 
DOI: 10.1007/s10909-012-0499-5

M. Hofherr, D. Rall, K. Il'in, A. Semenov, H.-W. Hübers, M. Siegel
“Dark Count Suppression in Superconducting Nanowire Single Photon Detectors”
Journal of Low Temperature Physics, Springer Netherlands,  1-5

DOI: 10.1007/s10909-012-0495-9

A. Engel, A. Aeschbacher, K. Inderbitzin, A. Schilling, K. Il'in, M. Hofherr, M. Siegel, A. Semenov, H.-W. Hübers
"Tantalum nitride superconducting single-photon detectors with low cut-off energy"
Appl. Phys. Lett. 100, 062601 (2012)
DOI: 10.1063/1.3684243

T. Ortlepp, M. Hofherr, L. Fritzsch, S. Engert, K. Ilin, D. Rall, H. Toepfer, H.-G. Meyer, and M. Siegel
"Demonstration of digital readout circuit for superconducting nanowire single photon detector"
Optics Express, Vol. 19, Issue 19, pp. 18593-18601 (2011)
doi:10.1364/OE.19.018593

P. Probst, A. Scheuring, M. Hofherr, D. Rall, S. Wünsch, K. Il’in, M. Siegel, A. Semenov, A. Pohl, H.-W. Hübers, V. Judin, A.-S. Müller, A. Hoehl, R. Müller, and G. Ulm,
"YBa2Cu3O7-d quasioptical detectors for fast time-domain analysis of terahertz synchrotron radiation"
Appl. Phys. Lett. 98, 043504 (2011)
DOI: 10.1063/1.3546173

D. Rall, P. Probst, M. Hofherr, S. Wünsch, K. Il'in, U. Lemmer, M. Siegel
"Relaxation time in NbN and YBCO thin films under optical irradiation"
Journal of Physics: Conference Series Volume 234 Part 4 (2010), 042029
DOI: 10.1088/1742-6596/234/4/042029

M. Hofherr, D. Rall, K. S. Ilin, A. Semenov, N. Gippius, H.-W. Hübers and M. Siegel
"Superconducting nanowire single-photon detectors: Quantum Efficiency vs. thickness of NbN films" 
Journal of Physics: Conference Series Volume 234 Part 1 (2010), 012017
DOI: 10.1088/1742-6596/234/1/012017

M. Hofherr, D. Rall, K. S. Il'in,  M. Siegel, A. Semenov, H.-W. Hübers, N. Gippius
"Intrinsic detection efficiency of superconducting nanowire single-photon detectors with different thicknesses"  
Journal of Applied Physics (Vol.108, Issue 1, 2010)
DOI: 10.1063/1.3437043

II. Veröffentlichungen auf internationalen Tagungen

Time-tagged multiplexing of SNSPDs for multi-pixel arrays
Matthias Hofherr, Julia Toussaint, Matthias Arndt, Konstantin Ilin, Thorsten May, Hans-Georg Meyer, Michael Siegel
Biennial European Conference on Applied Superconductivity, Genua, Italy (2013)

Single flux quantum circuit for SNSPD readout with improved sensitivity and scalability for integrated multi-pixel arrays
T. Ortlepp,M. Hofherr, K. Ilin, J. Toussaint, M. Siegel
14th International Superconductivity Electronics Conference (2013)

P. Trojan, K. Ilin, D. Henrich, M. Hofherr, A. Semenov, H.-W. Hübers and M. Siegel
"Superconducting nanowire single-photon detectors (SNSPDs) on SOI for near-infrared range"
DPG-Frühjahrsragung, Regensburg, Germany (2013)

P. Probst, A. Scheuring, M. Hofherr , S. Wuensch, K. Il’in, A. Pohl, A. Semenov, H.-W. Huebers, V. Judin, A.-S. Mueller, A. Hoehl, R. Mueller, G. Ulm, J. Haenisch, B. Holzapfel and M. Siegel
"YBa2Cu3O7-δ high-speed detectors for picosecond THz pulses"
23rd International Symposium on Space Terahertz Technology, Tokyo, 2-4 April 2012

Superconducting nanowire single-photon detectors for time correlated single photon counting
Matthias Hofherr, Konstantin Il'in, Dagmar Henrich, Matthias Arndt, Michael Siegel, Julia Toussaint, Roman Grüner, Torsten May, Marco Schubert, Hans-Georg Meyer, Benjamin Dietzek, Jürgen Popp
FLIM, Saarbrücken (2012)

Code division multiplexing for superconducting nanowire single photon detectors using RSFQ electronic
Matthias Hofherr, Olaf Wetzstein, Sonja Engert, Thomas Ortlepp, Dagmar Rall, Konstantin Ilin, Ronny Stolz, Hannes Töpfer, Hans-Georg Meyer, Michael Siegel
Applied Superconductivity Conference, Portland, USA (2012)

Superconducting nanowire single-photon detectors for picosecond time resolved spectroscopic applications
Matthias Hofherr, Konstantin Il‘in, Dagmar Henrich, Stefan Wünsch, Michael Siegel
Julia Toussaint, Marco Schubert , Torsten May, Hans-Georg Meyer, Roman Grüner, Benjamin Dietzek
Applied Superconductivity Conference, Portland, USA (2012)

Concept study of a multiplexing technique for superconducting nanowire single-photon detector arrays
S. Engert, O. Wetzstein, M. Hofherr, K. Ilin, M. Siegel, H.-G. Meyer, H. Toepfer
Applied Superconductivity Conference, Portland, USA (2012)

Concept study to derive parameter limits for orthogonal sequencing multiplexing for SNSPD arrays
S. Engert, O. Wetzstein, M. Hofherr, K. Ilin, H.-G. Meyer, H. Toepfer
Meeting on kryoelectronic devices 2011, Autrans (Grenoble), France (2011)

J. Toussaint, M. Hofherr, D. Henrich, K. Il'in, A. Semenov, H.-W. Hübers, H.-G. Meyer, M. Siegel
"Superconducting nanowire single-photon detectors: challenges in optimization of detector performance"
Meeting on kryoelectronic devices 2011, Autrans (Grenoble), France (2011)

O. Wetzstein, M. Hofherr, S. Engert, L. Fritzsch, T. Ortlepp, K. Il'in, D. Rall, R. Stolz, H. Töpfer, M. Siegel, H.-G. Meyer
"Simultaneous readout of a multi-pixel superconducting single-photon detector array"
Meeting on kryoelectronic devices 2011, Autrans (Grenoble), France (2011)

M. Hofherr, D. Henrich, K. Il'in, J. Toussaint, A. Semenov, H.-W. Hübers, H.-G. Meyer, M. Siegel
"Superconducting nanowire single-photon detectors: challenges in optimization of detector performance"
7th FLUXONICS RSFQ design workshop, Ilmenau, Germany (2011)

O. Wetzstein, M. Hofherr, S. Engert, L. Fritzsch, T. Ortlepp, K. Il'in, D. Rall, R. Stolz, H. Töpfer, M. Siegel, H.-G. Meyer
"Simultaneous readout of a multi-pixel superconducting single-photon detector array"
7th FLUXONICS RSFQ design workshop, Ilmenau, Germany (2011)

J. Toussaint, M. Hofherr, M. Schubert, K. Il'in, D. Rall, S. Wünsch, M. Siegel, H.-G. Meyer, T. May, R. Grüner, D. Akimov, B. Dietzek
"Superconducting micro-bolometers and single photon detectors for spectroscopic applications"
Meeting on kryoelectronic devices 2011, Autrans (Grenoble), France (2011)

A. Engel, K. Inderbitzin, A. Aeschbacher, A. Schilling, D. Rall, M. Hofherr, K. Il'in, M. Siegel
"Detection of X-rays using Superconducting Nanowire Single-Photon Detectors"
International Workshop on Nanowire Superconducting Single-Photon Detectors, Eindhoven, the Netherlands (2011)

M. Hofherr, K. Il'in, D. Rall, A. Semenov, H. Bartolf, A. Engel, A. SChilling, H.-W. Hübers, M. Siegel
"Suppression of dark counts of superconducting nanowire single-photon detectors caused by thermal fluctuations"
Superconductivity Centennial Conference EUCAS-ISEC-ICMC, World Forum, The Hague, the Netherlands (2011)

M. Hofherr, K. Il'in, D. Rall, O. Wetzstein, L. Fritsch, S. Engert, T. Ortlepp, A. Semenov, H.-W. Hübers, H.-G. Meayer, H. Töpfer, M. Siegel
"Single-flux quantum multiplexer for multi-pixel superconducting single-photon detector arrays"
Superconductivity Centennial Conference EUCAS-ISEC-ICMC, World Forum, The Hague, the Netherlands (2011)

K. Il'in, D. Rall, M. Hofherr, M. Siegel, A. Semenov, H.-W. Hübers, A. Engel, K. Inderbitzin, A. Aeschbacher, A. Schilling
"Ultra-thin TaN film nanowires for single-photon detection"
Superconductivity Centennial Conference EUCAS-ISEC-ICMC, World Forum, The Hague, the Netherlands (2011)

D. Rall, J. Toussaint, M. Hofherr, S. Wuensch,  K. S. Il’in, A. Semenov, H.-W. Huebers, M. Siegel
"Detection Efficiency and Cut-off Wavelength of NbN-SNSPD with Different Stoichiometry"
14th International Workshop on low temperature detectors, Heidelberg, Germany (2011)

M. Hofherr, K. Il'in, A. Semenov, D. Rall, H. Bartolf, A. Engel, A. Schilling, H.-W. Hübers, M. Siegel
"Fluctuations in thin NbN Nanowire Single-Photon Detectors"
14th International Workshop on low temperature detectors, Heidelberg, Germany (2011)

Philipp Jung, Alexander Lukashenko, Alexander P. Zhuravel, Stefan Wuensch, Matthias Hofherr, Konstantin Ilin, Michael Siegel, and Alexey V. Ustinov
"Spatially-Resolved Single-Photon Detection in NbN Nanowires"
DPG Frühjahrstagung, Dresden, Germany (2011)

K. Il'in, D. Rall, M. Hofherr, M. Siegel, A. Semenov, H.-W. Hübers, A. Engel, K. Inderbitzin, A. Aeschbacher, A. Schilling
"Superconducting ultra-thin TaN film nanostructures for optical and infrared detectors"
14th International Workshop on low temperature detectors, Heidelberg, Germany (2011)

D. Rall, M. Hofherr, J. Toussaint, K. S. Il’in, M. Siegel
"Energy relaxation processes in SNSPDs"
4th Dresden-Karlsruhe Seminar on Materials and Applications in Superconductivity, Bad Schandau, Germany (2011)

M. Hofherr, D. Rall, J. Toussaint, S. Wünsch, K. Ilin, M. Siegel
"SNSPD, readout concepts and application"
4th Dresden-Karlsruhe Seminar on Materials and Applications in Superconductivity, Bad Schandau, Germany (2011)

D. Rall, P. Probst, M. Hofherr, S. Wünsch, K. Il'in, S. Haindl, K. Iida, U. Lemmer, M. Siegel
"Investiagtion of Energy Relaxation Processes in ultra-thin Superconducting Films with Frequency Dmain Measurements"
3rd Dresden-Karlsruhe Seminar on Materials and Applications in Superconductivity, Bad Liebenzell, Germany (2010)

P. Probst, A. Scheuring, D. Rall, A. Stockhausen, M. Hofherr, S. Wünsch, K. Il‘in, A. Semenov, H.-W. Hübers, V. Judin, A.-S. Müller, Jens Hänisch, Bernhard Holzapfel and M. Siegel
"Ultra-fast hot-electron bolometer detectors for measurements of pulsed THz radiation"
3rd Dresden-Karlsruhe Seminar on Materials and Applications in Superconductivity, Bad Liebenzell, Germany (2010)

T. Ortlepp, M. Hofherr, K. Il'in, S. Engert, D. Rall, S. Wuensch, H. Toepfer, M. Siegel
(INVITED) "RSFQ BASED READOUT OF SUPERCONDUCTING SINGLE PHOTON DETECTORS"
Applied Superconductivity Conference 2010, Washington, USA (2010)

D. Rall, J. Toussaint, M. Hofherr, S. Wünsch, K. Il’in, A. Semenov, H.-W. Hübers, U. Lemmer and M. Siegel
"Improvement of SNSPD Detection Efficiency by Variation of NbN Chemical Composition"
Tagung kryoelektronische Bauelemente, Zeuthen, Germany (2010)

T. Ortlepp, M. Hofherr, K. Il'in, S. Engert, D. Rall, H. Toepfer, M. Siegel
"RSFQ based readout of superconducting single photon detectors"
Tagung kryoelektronische Bauelemente, Zeuthen, Germany (2010)

K. Il'in, D. Rall, M.Hofherr, M. Siegel, A. Semenov, H.-W. Hübers, A. Engel A. Schilling
"TaN thin films for Superconducting Nanowire Single-Photon Detectors"
Tagung kryoelektronische Bauelemente, Zeuthen, Germany (2010)

P. Probst, A. Scheuring, M. Hofherr, A. Stockhausen, D. Rall, S. Wünsch, K. Il‘in, A. Semenov, H.-W. Hübers, V. Judin, A.-S. Müller, J. Hänisch, B. Holzapfel and M. Siegel
„High-speed YBCO detectors for resolving picosecond THz pulses”
Tagung kryoelektronische Bauelemente, Zeuthen, Germany (2010)

D. Rall, K. S. Il’in, M. Hofherr, P. Probst, S. Wünsch, U. Lemmer, M. Siegel, A. D. Semenov, H.-W. Hübers
"Investigation of NbN thin film response to optical irradiation for detector application"
2nd S-Pulse Karlsruhe Detector Workshop, Karlsruhe, Germany (2010)

M. Hofherr, K. Ilin, A. Semenov, N. Gippius, D. Rall, H.- W. Hübers, M. Siegel
"Improved understanding of superconducting nanowire single-photon detectors, a key to a better performance"
KHYSSymposium (2010)

M. Hofherr, K. Ilin, D. Rall, M. Siegel, A. D. Semenov, H.-W. Hübers, N. Gippius
"Intrinsic detection efficiency of superconducting nanowire single-photon detectors with different thicknesses"
2nd S-Pulse Karlsruhe Detector Workshop, Karlsruhe, Germany (2010)

P. Probst, D. Rall, A. Scheuring, M. Hofherr, S. Wünsch, K. Il‘in, A. Semenov, H.-W. Hübers, V. Judin, A.-S. Müller and M. Siegel
"Superconducting YBCO hot-electron bolometer detectors for picosecond time resolution of THz pulses"
456. Wilhelm und Else Heraeus Seminar, THz radiation: Generation, Detection and Applications, Bad Honnef, Germany (2010)

P. Probst, D. Rall, M. Hofherr, S. Wünsch, K. Ilin and M. Siegel
"Energy relaxation processes in YBCO thin films studied by frequency and time-domain techniques"
DPG Frühjahrstagung der Sektion Kondensierte Materie (SKM), Regensburg, Germany (2010)

Philipp Jung, Alexander Lukashenko, Alexander P. Zhuravel, Stefan Wuensch, Matthias Hofherr, Konstantin Ilin, Michael Siegel, and Alexey V. Ustinov
"Spacially resolved investigation of superconducting NbN nanowire single photon detectors"
DPG Frühjahrstagung der Sektion Kondensierte Materie (SKM), Regensburg, Germany (2010)

M. Hofherr, K. Ilin, A. Semenov, N. Gippius, D. Rall, H.- W. Hübers, M. Siegel
"Superconducting nanowire single-photon detectors: Intrinsic quantum efficiency vs. thickness of NbN films"
Tagung Kryoelektronische Bauelemente, Oberhof, Germany (2009)

P. Probst, D. Rall, M. Hofherr, S. Wünsch, K. Ilin and M. Siegel
"Measurements of energy relaxation time in thin YBa2Cu3O7-X films on sapphire substrates"
Kryoelektronische Bauelemente 2009, Oberhof, Germany (2009)

M. Hofherr, K. Ilin, A. Semenov, N. Gippius, D. Rall, H.- W. Hübers, M. Siegel
"Superconducting nanowire single-photon detectors: Intrinsic quantum efficiency vs. thickness of NbN films"
European Conference on Applied Superconductivity, Dresden, Germany (2009)

D. Rall, P. Probst, M. Hofherr, S. Wünsch, K. Ilin, U. Lemmer, M. Siegel
"Energy Relaxation Time in NbN and YBa2Cu3O7-d Thin Films under Optical Radiation"
European Conference on Applied Superconductivity, Dresden, Germany (2009)

P. Probst, K. S. Il’in, D. Rall, M. Hofherr, S. Wünsch and M. Siegel
"High-Tc thin films for fast THz detectors"
2nd Dresden-Karlsruhe Seminar on Materials and Applications in Superconductivity, Colditz, Germany (2009)

D. Rall, M. Hofherr, K. Il'in, S. Wünsch, M. Siegel, U. Lemmer, A. Semenov, H.-W. Hübers
"Investigation of Energy Relaxation Processes in NbN thin films using Optical Irradiation"
DPG Frühjahrstagung der Sektion Kondensierte Materie (SKM), Dresden, Germany, (2009)