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Proceedings Paper

Doubling of sensitivity and bandwidth in phonon-cooled hot-electron bolometer mixers
Author(s): Jochem J. A. Baselmans; Merlijn Hajenius; Jianrong Gao; Piet de Korte; Teun M. Klapwijk; Boris Voronov; Gregory Gol'tsman
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Paper Abstract

NbN hot electron bolometer (HEB) mixers are at this moment the best heterodyne detectors for frequencies above 1 THz. However, the fabrication procedure of these devices is such that the quality of the interface between the NbN superconducting film and the contact structure is not under good control. This results in a contact resistance between the NbN bolometer and the contact pad. We compare identical bolometers, with different NbN - contact pad interfaces, coupled with a spiral antenna. We find that cleaning the NbN interface and adding a thin additional superconductor prior to the gold contact deposition improves the noise temperature and the bandwidth of the HEB mixers with more than a factor of 2. We obtain a DSB noise temperature of 950 K at 2.5 THz and a Gain bandwidth of 5-6 GHz. For use in real receiver systems we design small volume (0.15x1 micron) HEB mixers with a twin slot antenna. We find that these mixers combine good sensitivity (900 K at 1.6 THz) with low LO power requirement, which is 160 - 240 nW at the Si lens of the mixer. This value is larger than expected from the isothermal technique and the known losses in the lens by a factor of 3-3.5.

Paper Details

Date Published: 8 October 2004
PDF: 9 pages
Proc. SPIE 5498, Millimeter and Submillimeter Detectors for Astronomy II, (8 October 2004); doi: 10.1117/12.552547
Show Author Affiliations
Jochem J. A. Baselmans, Space Research Organization of the Netherlands (Netherlands)
Merlijn Hajenius, Space Research Organization of the Netherlands (Netherlands)
Technische Univ. Delft (Netherlands)
Jianrong Gao, Space Research Organization of (Netherlands)
Technische Univ. Delft (Netherlands)
Piet de Korte, Space Research Organization of the Netherlands (Netherlands)
Teun M. Klapwijk, Technische Univ. Delft (Netherlands)
Boris Voronov, Moscow State Pedagogical Univ. (Russia)
Gregory Gol'tsman, Moscow State Pedagogical Univ. (Russia)

Published in SPIE Proceedings Vol. 5498:
Millimeter and Submillimeter Detectors for Astronomy II
Jonas Zmuidzinas; Wayne S. Holland; Stafford Withington, Editor(s)

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