Dr. Karl Jacobs Profile

Dr. Karl Jacobs

at Univ zu Köln

SPIE Involvement:

Author

Publications (23)

Proceedings Article | 14 December 2020 Poster + Paper

Towards ultra-broadband heterodyne interferometry in the N- and Q-bands

Ernest Michael, Ramin Emadi, Enrique Moreno, Lucas Labadie, Cornelia Honingh, Karl Jacobs, Urs Graf, Stephan Schlemmer, Jürgen Stutzki

Proceedings Volume 11446, 114462O (2020) https://doi.org/10.1117/12.2563069

KEYWORDS: Heterodyning, Interferometry, Telescopes, Graphene, Optical correlators, Dense wavelength division multiplexing, Laser development, Mid-IR, Optical spheres, Planets

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Proceedings Article | 30 November 2017 Paper

A 230 GHz SIS-receiver for radio astronomy with 25 GHz instantaneous bandwidth

Karl Jacobs

Proceedings Volume 2250, 22507K (2017) https://doi.org/10.1117/12.2303289

KEYWORDS: Waveguides, Temperature metrology, Radio astronomy, Receivers, Double sideband modulation, Capacitance, Superconductors, Beam splitters, Heterodyning, Integrated circuit design

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Proceedings Article | 19 August 2014 Paper

Optics and cryogenics for the 1.1 THz multi-pixel heterodyne receiver for APEX

Norma Hurtado, Urs Graf, Henning Adams, C. Honingh, Karl Jacobs, Patrick Pütz, Rolf Güsten, Jürgen Stutzki

Proceedings Volume 9153, 915327 (2014) https://doi.org/10.1117/12.2055563

KEYWORDS: Receivers, Mirrors, Telescopes, Terahertz radiation, Aluminum, Computer aided design, Heterodyning, Cryogenics, Thermography, Polarizers

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The 1.1 THz multi-pixel heterodyne receiver will be mounted in the Nasmyth A cabin of the 12 m APEX telescope on the Chajnantor plateau, 5000 meters altitude in northern Chile. The receiver will cover the spectral window of 1000 - 1080 GHz, where important spectral lines like CO 9-8 at 1036.9 GHz, a tracer of warm and dense gas and OH+ at 1033 GHz and NH+ at 1012.6 GHz, both important for the study of chemical networks in the ISM, are located. The multi-pixel receiver greatly enhances the science output under the difficult observing conditions in this frequency range. Two 9-pixel focal plane sub-arrays on orthogonal polarizations are installed in easily removable cartridges. We developed a new thermal link to connect the cartridges to the cryostat. Our thermal link is an all-metal design: aluminum and Invar. All the optics is fully reflective, thus avoiding the absorption and reflection losses of dielectric lenses and reducing standing waves in the receiver. To guaranty internal optics alignment, we employ a monolithic integrated optics approach for the cold optics and the Focal Plane Unit (FPU) optics modeled after the CHARM (Compact Heterodyne Array Receiver Module) concept. The receiver uses synthesizer-driven solid-state local oscillators (LO) and the mixers will be balanced SIS mixers, which are essentially based on the design of the on-chip balanced SIS mixers at 490 GHz developed in our institute. Singleended HEB mixers are used for the laboratory tests of the optics. The LO power distribution is accommodated behind the FPU optics. It is composed of the LO optics, which includes a collimating Fourier grating, and an LO distribution plate to supply LO signal to each of the 9 pixels of the sub-array. Different options for the LO coupling design and fabrication are being analyzed and will be based on in-house hybrid waveguide/planar technology. We summarize the receiver project with emphasis on the cryogenics and the optics and present laboratory test results of the cryogenics, including the thermal link's performance. Beam pattern measurements of the receiver optics are scheduled for the coming days, but unfortunately could not be included in the current paper.

Proceedings Article | 15 July 2010 Paper

A 700 GHz unilateral finline SIS mixer fed by a multi-flare angle smooth-walled horn

Boon-Kok Tan, Ghassan Yassin, Paul Grimes, Jamie Leech, Karl Jacobs, Stafford Withington, Mike Tacon, Christopher Groppi

Proceedings Volume 7741, 774110 (2010) https://doi.org/10.1117/12.856711

KEYWORDS: Waveguides, Silicon, Superconductors, Transformers, Capacitance, Double sideband modulation, Gold, Lead, Sensors, Heterodyning

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Proceedings Article | 19 July 2008 Paper

Submillimeter heterodyne arrays for APEX

R. Güsten, A. Baryshev, A. Bell, A. Belloche, U. Graf, H. Hafok, S. Heyminck, S. Hochgürtel, C. Honingh, K. Jacobs, C. Kasemann, B. Klein, T. Klein, A. Korn, I. Krämer, C. Leinz, A. Lundgren, K. Menten, K. Meyer, D. Muders, F. Pacek, D. Rabanus, F. Schäfer, P. Schilke, G. Schneider, J. Stutzki, G. Wieching, A. Wunsch, F. Wyrowski

Proceedings Volume 7020, 702010 (2008) https://doi.org/10.1117/12.788271

KEYWORDS: Telescopes, Receivers, Heterodyning, Spectrometers, Raster graphics, Calibration, Sensors, Field programmable gate arrays, Atmospheric optics, Optical filters

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Proceedings Article | 10 July 2008 Paper

Pre-HEAT: submillimeter site testing and astronomical spectra from Dome A, Antarctica

C. Kulesa, C. Walker, M. Schein, D. Golish, N. Tothill, P. Siegel, S. Weinreb, G. Jones, J. Bardin, K. Jacobs, C. Martin, J. Storey, M. Ashley, J. Lawrence, D. Luong-Van, J. Everett, L. Wang, L. Feng, Z. Zhu, J. Yan, J. Yang, X.-G. Zhang, X. Cui, X. Yuan, J. Hu, Z. Xu, Z. Jiang, H. Yang, Y. Li, B. Sun, W. Qin, Z. Shang

Proceedings Volume 7012, 701249 (2008) https://doi.org/10.1117/12.789741

KEYWORDS: Telescopes, Receivers, Domes, Astronomy, Spectroscopy, Observatories, Heterodyning, Opacity, Space telescopes, Control systems

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Proceedings Article | 26 September 2007 Paper

GREAT: the German first light heterodyne instrument for SOFIA

Urs Graf, Stefan Heyminck, Rolf Güsten, Paul Hartogh, Heinz-Wilhelm Hübers, Jürgen Stutzki, Jérôme Faist, Milan Fischer, Karl Jacobs, Martin Philipp, David Rabanus, Alexej Semenov, Peter van der Wal, Armin Wagner-Gentner, Christoph Walther, Martina Wiedner

Proceedings Volume 6678, 66780K (2007) https://doi.org/10.1117/12.768027

KEYWORDS: Terahertz radiation, Receivers, Quantum cascade lasers, Oscillators, Heterodyning, Spectrometers, Electronics, Spectral resolution, Photography, Observatories

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Proceedings Article | 27 June 2006 Paper

GREAT: the German first light heterodyne instrument for SOFIA

Urs Graf, Stefan Heyminck, Rolf Güsten, Paul Hartogh, Heinz-Wilhelm Hübers, Karl Jacobs, Martin Philipp, David Rabanus, Hans-Peter Röser, Jürgen Stutzki, Peter van der Wal, Armin Wagner-Gentner

Proceedings Volume 6275, 62750K (2006) https://doi.org/10.1117/12.673168

KEYWORDS: Terahertz radiation, Receivers, Oscillators, Heterodyning, Spectrometers, Spectral resolution, Astronomy, Photography, Bolometers, Calibration

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Proceedings Article | 8 October 2004 Paper

Fabrication and characterization of phonon-cooled hot-electron bolometers on freestanding 2-µm silicon nitride membranes for THz applications

Pedro Munoz, Sven Bedorf, Michael Brandt, Thomas Tils, Netty Honingh, Karl Jacobs

Proceedings Volume 5498, (2004) https://doi.org/10.1117/12.550104

KEYWORDS: Silicon, Waveguides, Terahertz radiation, Receivers, Superconductors, Bridges, Gold, Bolometers, Temperature metrology, Etching

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Proceedings Article | 8 October 2004 Paper

High sensitivity 810 GHz SIS receivers at AST/RO

Patrick Putz, Stefan Glenz, Rafael Teipen, Thomas Tils, Netty Honingh, Karl Jacobs, Abigail Hedden, Craig Kulesa, Christopher Groppi, Christopher Walker

Proceedings Volume 5498, (2004) https://doi.org/10.1117/12.550894

KEYWORDS: Receivers, Heterodyning, Waveguides, Niobium, Temperature metrology, Astronomy, Electrodes, Chemical mechanical planarization, Observatories, Carbon

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Proceedings Article | 8 October 2004 Paper

1.4-THz receiver for APEX and for GREAT on SOFIA

Gundolf Schmidt, Frank Bielau, Urs Graf, C. Honingh, Karl Jacobs, Katharina Rettenbacher, Jurgen Stutzki, Martina Wiedner

Proceedings Volume 5498, (2004) https://doi.org/10.1117/12.550334

KEYWORDS: Receivers, Terahertz radiation, Telescopes, Astronomy, Stars, Carbon monoxide, Mirrors, Observatories, Heterodyning, Oscillators

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Proceedings Article | 28 September 2004 Paper

Forecast for HEAT on Dome A, Antarctica: the High Elevation Antarctic Terahertz Telescope

Christopher Walker, Craig Kulesa, Dathon Golish, Abigail Hedden, K. Jacobs, Juergen Stutzki, J. Gao, Jacob Kooi, Dave Glaister, Willy Gully, Imran Mehdi, Mark Swain, Peter Siegel

Proceedings Volume 5489, (2004) https://doi.org/10.1117/12.551424

KEYWORDS: Telescopes, Terahertz radiation, Space telescopes, Receivers, Stars, Cryogenics, Cryocoolers, Galactic astronomy, Clouds, Heterodyning

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Proceedings Article | 3 March 2003 Paper

STAR: SOFIA terahertz array receiver

Urs Graf, Stefan Heyminck, D. Rabanus, Karl Jacobs, Rudolf Schieder, Juergen Stutzki

Proceedings Volume 4857, (2003) https://doi.org/10.1117/12.458821

KEYWORDS: Receivers, Stars, Oscillators, Integrated optics, Polarization, Mirrors, Terahertz radiation, Beam splitters, Bolometers, Heterodyning

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Proceedings Article | 3 March 2003 Paper

GREAT: the German Receiver for Astronomy at Terahertz Frequencies

Rolf Guesten, Ivan Camara, Paul Hartogh, Heinz-Wilhelm Huebers, Urs Graf, Karl Jacobs, Christoph Kasemann, Hans-Peter Roeser, Rudolf Schieder, Gert Schnieder, Oliver Sievertz, Juergen Stutzki, Geronimo Villanueva, Armin Wagner, Peter van der Wal, Achim Wunsch

Proceedings Volume 4857, (2003) https://doi.org/10.1117/12.458820

KEYWORDS: Spectroscopy, Receivers, Astronomy, Data acquisition, Heterodyning, Oscillators, Spectroscopes, Terahertz radiation, Beam splitters, Spectral resolution

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Proceedings Article | 17 February 2003 Paper

700-GHz finline mixer with threee-stage stub tuning

Ghassan Yassin, Phechit Kittara, Paul Grimes, Stafford Withington, Karl Jacobs

Proceedings Volume 4855, (2003) https://doi.org/10.1117/12.459363

KEYWORDS: Antennas, Superconductors, Waveguides, Niobium, Receivers, Polarization, Device simulation, Temperature metrology, Beam splitters, Quartz

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Proceedings Article | 17 February 2003 Paper

SMART: the KOSMA submillimeter array receiver for two frequencies

Urs Graf, Stefan Heyminck, Ernest Michael, S. Stanko, C. Honingh, Karl Jacobs, Rudolf Schieder, Juergen Stutzki, B. Vowinkel

Proceedings Volume 4855, (2003) https://doi.org/10.1117/12.459669

KEYWORDS: Receivers, Telescopes, Mirrors, Electronics, Astronomy, Niobium, Beam splitters, Space telescopes, Photography, Control systems

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Proceedings Article | 20 June 2000 Paper

GREAT: the first-generation German heterodyne receiver for SOFIA

Rolf Guesten, Paul Hartogh, Heinz-Wilhelm Huebers, Urs Graf, K. Jacobs, Hans-Peter Roeser, Frank Schaefer, Rudolf Schieder, Ronald Stark, Juergen Stutzki, Peter Van der Wal, Achim Wunsch

Proceedings Volume 4014, (2000) https://doi.org/10.1117/12.389122

KEYWORDS: Terahertz radiation, Heterodyning, Spectroscopy, Receivers, Astronomy, Spectral resolution, Sensors, Oscillators, Spectroscopes, Acousto-optics

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Proceedings Article | 20 June 2000 Paper

SOFIA terahertz array receiver (STAR)

Ernest Michael, Urs Graf, C. Honingh, K. Jacobs, F. Lewen, Rudolf Schieder, Juergen Stutzki

Proceedings Volume 4014, (2000) https://doi.org/10.1117/12.389127

KEYWORDS: Receivers, Stars, Mirrors, Oscillators, Terahertz radiation, Carbon, Telescopes, Sensors, Polarization, Bolometers

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Proceedings Article | 31 July 1998 Paper

Heterodyne instrument for FIRST (HIFI): preliminary design

Mattheus de Graauw, Nick Whyborn, Herman van de Stadt, Gerard Beaudin, Douwe Beintema, Victor Belitsky, Philippe Cais, Emmanuel Caux, M. Gheudin, Alain Cros, P. de Groene, A. Emrich, Neal Erickson, Todd Gaier, Juan Gallego-Puyol, Jianrong Gao, Paul Hartogh, N. Honingh, J. Horn, K. Jacobs, R. Kruisinga, F. Lura, Alain Lecacheux, Vincenzo Natale, R. Orfei, John Pearson, Thomas Phillips, Peter Roelfsema, Carlo Rosolen, Morvan Salez, Rudolf Schieder, Karl-Friedrich Schuster, Gerhard Schwaab, J. Starsky, Juergen Stutzki, S. Torchinsky, Boris van Leeuwen, Huib Visser, Klaas Wildeman, Stafford Withington, Jonas Zmuidzinas

Proceedings Volume 3357, (1998) https://doi.org/10.1117/12.317368

KEYWORDS: Spectrometers, Mirrors, Oscillators, Polarization, Calibration, Control systems, Telescopes, Heterodyning, Acousto-optics, Optical amplifiers

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Proceedings Article | 31 July 1998 Paper

Array receiver development at KOSMA for the submillimeter and terahertz spectral range

Urs Graf, S. Haas, C. Honingh, K. Jacobs, Rudolf Schieder, Juergen Stutzki

Proceedings Volume 3357, (1998) https://doi.org/10.1117/12.317351

KEYWORDS: Receivers, Terahertz radiation, Oscillators, Telescopes, Mirrors, Waveguides, Beam splitters, Bolometers, Heterodyning, Astronomy

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Proceedings Article | 14 December 1992 Paper

Performance of a 230 GHz SIS receiver using broadband integrated matching structures

K. Jacobs

Proceedings Volume 1929, 19294L (1992) https://doi.org/10.1117/12.2298282

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Proceedings Article | 14 December 1992 Paper

A 35 GHz hst monolithic grid oscillator

K. Jacobs

Proceedings Volume 1929, 19295K (1992) https://doi.org/10.1117/12.2298317

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Proceedings Article | 1 October 1991 Paper

Mixer gain calculations of a SIS waveguide mixer using an integrated tuning structure

K. Jacobs

Proceedings Volume 1576, 15761Y (1991) https://doi.org/10.1117/12.2297783

KEYWORDS: Waveguides, Capacitance, Quantum physics, Data modeling, RF coupling, Integrated circuit design, Integrated circuits, Resistance, Linear filtering, Superconductors

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Showing 5 of 23 publications

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