Die Forschungsaktivitäten konzentrieren sich auf die Entwicklung und Anwendung hochauflösender Terahertz- und Infrarot-Spektroskopie, insbesondere unter Verwendung von Quantenkaskadenlasern und supraleitenden Mischern. Ein weiterer Schwerpunkt liegt auf der Charakterisierung von Halbleitermaterialien wie Silizium, Germanium und Diamant für optoelektronische Anwendungen im mittleren Infrarotbereich. Zudem werden spektroskopische Instrumente für die planetare Exploration entwickelt, darunter Raman- und LIBS-Spektrometer für Rover-Missionen wie IDEFIX auf Phobos. Die Arbeiten umfassen auch die Modellierung atmosphärischer Prozesse und die Entwicklung von Detektoren für Quantenlicht.
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Prof. Dr. Dr. h.c. Heinz-Wilhelm Hübers
HU-FIS-Profil ↗Förderer: DFG Sachbeihilfe Zeitraum: 07/2015 - 12/2017 Projektleitung: Prof. Dr. Dr. h.c. Heinz-Wilhelm Hübers
Förderer: DFG Sachbeihilfe Zeitraum: 11/2017 - 10/2020 Projektleitung: Prof. Dr. Dr. h.c. Heinz-Wilhelm Hübers
Förderer: DFG Sachbeihilfe Zeitraum: 04/2018 - 03/2021 Projektleitung: Prof. Dr. Dr. h.c. Heinz-Wilhelm Hübers
Physical Review Letters · DOI
A new technology for generating steady state, brilliant, broadband, coherent, far-infrared (FIR) radiation in electron storage rings is presented, suitable for FIR spectroscopy. An FIR power increase of up to 100 000 compared to the normal, incoherent synchrotron radiation in the range of approximately 5 to approximately 40 cm(-1) could be achieved. The source is up to 1000 times more brillant compared to a standard Hg arc lamp. The coherent synchrotron radiation is produced in a "low alpha" optics mode of the synchrotron light source BESSY, by bunch shortening and non-Gaussian bunch deformation.
Astronomy and Astrophysics · DOI
We describe the design and construction of GREAT (German REceiver for Astronomy at Terahertz frequencies) operated on the Stratospheric Observatory For Infrared Astronomy (SOFIA). GREAT is a modular dual-color heterodyne instrument for high-resolution far-infrared (FIR) spectroscopy. Selected for SOFIA’s Early Science demonstration, the instrument has successfully performed three Short and more than a dozen Basic Science flights since first light was recorded on its April 1, 2011 commissioning flight. We report on the in-flight performance and operation of the receiver that – in various flight configurations, with three different detector channels – observed in several science-defined frequency windows between 1.25 and 2.5 THz. The receiver optics was verified to be diffraction-limited as designed, with nominal efficiencies; receiver sensitivities are state-of-the-art, with excellent system stability. The modular design allows for the continuous integration of latest technologies; we briefly discuss additional channels under development and ongoing improvements for Cycle 1 observations. GREAT is a principal investigator instrument, developed by a consortium of four German research institutes, available to the SOFIA users on a collaborative basis.
IEEE Journal of Selected Topics in Quantum Electronics · DOI
The state-of-the art of terahertz heterodyne receivers are reviewed. Emphasis is placed on front-end components such as mixers and local oscillators. The back-end technology is described to a lesser extent. Recent developments, which are expected to have a major impact in the future, are also discussed.