Universität zu Köln

Buechel, Denis, Puetz, Patrick, Jacobs, Karl, Schultz, Michael, Graf, Urs U., Risacher, Christophe, Richter, Heiko, Ricken, Oliver, Huebers, Heinz-Wilhelm, Guesten, Rolf, Honingh, Cornelia E. and Stutzki, Juergen (2015). 4.7-THz Superconducting Hot Electron Bolometer Waveguide Mixer. IEEE Trans. Terahertz Sci. Technol., 5 (2). S. 207 - 215. PISCATAWAY: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC. ISSN 2156-342X

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Abstract

We present the first superconducting hot electron bolometer (HEB) waveguide mixer operating at 4.7 THz. The 5.5-nm-thick, 300-nm-long, and 3600-nm-wide NbN HEB micro-bridge is integrated into a normal metal (Au) planar circuit on a 2 mu m thick silicon substrate. This circuit is integrated in a 24 mu m x 48 mu m x 21 mu m waveguide cavity and a 14 mu m x 7 mu m x 200 mu m substrate channel, which is directly machined into a CuTe alloy block. The power spectrum of the HEB mixer, measured with a Fourier transform spectrometer, is in good agreement with the results of 3-D EM circuit simulation. Measured mixer performance shows a state-of-the-art double sideband noise temperature of 1100 K, averaged over the IF bandwidth of 0.2-3.5 GHz. The 3-dB noise roll-off is 3.5 GHz. This mixer is used in the German REceiver for Astronomy at Terahertz frequencies (GREAT) at the airborne Stratospheric Observatory for Far Infrared Astronomy (SOFIA).

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Buechel, Denis UNSPECIFIED UNSPECIFIED UNSPECIFIED Puetz, Patrick UNSPECIFIED UNSPECIFIED UNSPECIFIED Jacobs, Karl UNSPECIFIED UNSPECIFIED UNSPECIFIED Schultz, Michael UNSPECIFIED UNSPECIFIED UNSPECIFIED Graf, Urs U. UNSPECIFIED UNSPECIFIED UNSPECIFIED Risacher, Christophe UNSPECIFIED UNSPECIFIED UNSPECIFIED Richter, Heiko UNSPECIFIED UNSPECIFIED UNSPECIFIED Ricken, Oliver UNSPECIFIED UNSPECIFIED UNSPECIFIED Huebers, Heinz-Wilhelm UNSPECIFIED UNSPECIFIED UNSPECIFIED Guesten, Rolf UNSPECIFIED UNSPECIFIED UNSPECIFIED Honingh, Cornelia E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Stutzki, Juergen UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-410820
DOI:	10.1109/TTHZ.2014.2382434
Journal or Publication Title:	IEEE Trans. Terahertz Sci. Technol.
Volume:	5
Number:	2
Page Range:	S. 207 - 215
Date:	2015
Publisher:	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Place of Publication:	PISCATAWAY
ISSN:	2156-342X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language HEB MIXER; HETERODYNE INSTRUMENT; NOISE; GREAT Multiple languages Engineering, Electrical & Electronic; Optics; Physics, Applied Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/41082