Records |
Author |
Gao, J. R.; Hajenius, M.; Baselmans, J. J. A.; Yang, Z. Q.; Baryshev, A. M.; Barends, R.; Klapwijk, T. M.; Voronov, B.; Gol'tsman, G.; Callaos, N. |
Title |
Twin-slot antenna coupled NbN hot electron bolometer mixers for space applications |
Type |
Conference Article |
Year |
2005 |
Publication |
Proc. 9-th WMSCI |
Abbreviated Journal |
Proc. 9-th WMSCI |
Volume |
9 |
Issue |
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Pages |
148-153 |
Keywords |
NbN HEB mixers |
Abstract |
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Address |
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Corporate Author |
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Thesis |
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Publisher |
International Institute of Informatics and Systemics |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
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ISBN |
9806560639, 9789806560635 |
Medium |
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Area |
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Expedition |
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Conference |
9th World Multi-Conference on Systemics, Cybernetics and Informatics |
Notes |
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Approved |
no |
Call Number |
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Serial |
1480 |
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Author |
Baselmans, J. J. A.; Hajenius, M.; Gao, J. R.; Baryshev, A.; Kooi, J.; Klapwijk, T. M.; Voronov, B.; de Korte, P.; Gol'tsman, G. |
Title |
NbN hot electron bolometer mixers: sensitivity, LO power, direct detection and stability |
Type |
Journal Article |
Year |
2005 |
Publication |
IEEE Trans. Appl. Supercond. |
Abbreviated Journal |
IEEE Trans. Appl. Supercond. |
Volume |
15 |
Issue |
2 |
Pages |
484-489 |
Keywords |
HEB mixers, direct detection effect, stability, Allan variance |
Abstract |
We demonstrate that the performance of NbN lattice cooled hot electron bolometer mixers depends strongly on the interface quality between the bolometer and the contact structure. Both the receiver noise temperature and the gain bandwidth can be improved by a factor of 2 by cleaning the interface and adding an additional superconducting interlayer to the contact pad. Using this we obtain a double sideband receiver noise temperature of 950 K at 2.5 THz and 4.3 K, using a 0.4/spl times/4 /spl mu/m HEB mixer with a spiral antenna. At the same bias point, we obtain an IF gain bandwidth of 6 GHz. To comply with current demands on THz mixers for use in space based receivers we reduce the device size to 0.15/spl times/1 /spl mu/m and use a twin slot antenna. We report measurements of the noise temperature, LO power requirement, stability and the direct detection effect, using a mixer with a 1.6 THz twin slot antenna and a 1.462 THz solid state LO source with calibrated output power. |
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Series Editor |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
1051-8223 |
ISBN |
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Medium |
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Area |
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Expedition |
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Conference |
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Notes |
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Approved |
no |
Call Number |
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Serial |
546 |
Permanent link to this record |
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Author |
Hajenius, M.; Barends, R.; Gao, J. R.; Klapwijk, T. M.; Baselmans, J. J. A.; Baryshev, A.; Voronov, B.; Gol'tsman, G. |
Title |
Local resistivity and the current-voltage characteristics of hot electron bolometer mixers |
Type |
Journal Article |
Year |
2005 |
Publication |
IEEE Trans. Appl. Supercond. |
Abbreviated Journal |
IEEE Trans. Appl. Supercond. |
Volume |
15 |
Issue |
2 |
Pages |
495-498 |
Keywords |
HEB mixer distributed model, HEB distributed model, distributed HEB model |
Abstract |
Hot-electron bolometer devices, used successfully in low noise heterodyne mixing at frequencies up to 2.5 THz, have been analyzed. A distributed temperature numerical model of the NbN bridge, based on a local electron and a phonon temperature, is used to model pumped IV curves and understand the physical conditions during the mixing process. We argue that the mixing is predominantly due to the strongly temperature dependent local resistivity of the NbN. Experimentally we identify the origins of different transition temperatures in a real HEB device, suggesting the importance of the intrinsic resistive transition of the superconducting bridge in the modeling. |
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Series Editor |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
1051-8223 |
ISBN |
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Medium |
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Area |
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Notes |
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Approved |
no |
Call Number |
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Serial |
980 |
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Author |
Hajenius, M.; Baselmans, J. J. A.; Gao, J. R.; Klapwijk, T. M.; de Korte, P. A. J.; Voronov, B.; Gol'tsman, G. |
Title |
Low noise NbN superconducting hot electron bolometer mixers at 1.9 and 2.5 THz |
Type |
Journal Article |
Year |
2004 |
Publication |
Supercond. Sci. Technol. |
Abbreviated Journal |
Supercond. Sci. Technol. |
Volume |
17 |
Issue |
5 |
Pages |
S224-S228 |
Keywords |
NbN HEB mixers |
Abstract |
NbN phonon-cooled hot electron bolometer mixers (HEBs) have been realized with negligible contact resistance between the bolometer itself and the contact structure. Using a combination of in situ cleaning of the NbN film and the use of an additional superconducting interlayer of a 10 nm NbTiN layer between the Au of the contact structure and the NbN film superior noise temperatures have been obtained as low as 950 K at 2.5 THz and 750 K at 1.9 THz. Here we address in detail the DC characterization of these devices, the interface transparencies between the bolometers and the contacts and the consequences of these factors on the mixer performance. |
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Series Editor |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
0953-2048 |
ISBN |
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Medium |
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Notes |
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Approved |
no |
Call Number |
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Serial |
558 |
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Author |
Gao, J. R.; Hajenius, M.; Yang, Z. Q.; Baselmans, J. J. A.; Khosropanah, P.; Barends, R.; Klapwijk, T. M. |
Title |
Terahertz superconducting hot electron bolometer heterodyne receivers |
Type |
Journal Article |
Year |
2007 |
Publication |
IEEE Trans. Appl. Supercond. |
Abbreviated Journal |
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Volume |
17 |
Issue |
2 |
Pages |
252-258 |
Keywords |
HEB, mixer, direct detection effect |
Abstract |
We highlight the progress on NbN hot electron bolometer (HEB) mixers achieved through fruitful collaboration between SRON Netherlands Institute for Space Research and Delft University of Technology, the Netherlands. This includes the best receiver noise temperatures of 700 K at 1.63 THz using a twin-slot antenna mixer and 1050 K at 2.84 THz using a spiral antenna coupled HEB mixer. The mixers are based on thin NbN films on Si and fabricated with a new contact-process and-structure. By reducing their areas HEB mixers have shown an LO power requirement as low as 30 nW. Those small HEB mixers have demonstrated equivalent sensitivity as those with large areas provided the direct detection effect due to broadband radiation is removed. To manifest that a HEB based heterodyne receiver can in practice be used at arbitrary frequencies above 2 THz, we demonstrate a 2.8 THz receiver using a THz quantum cascade laser (QCL) as local oscillator. |
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Series Editor |
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Series Volume |
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Edition |
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ISSN |
1051-8223 |
ISBN |
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Notes |
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no |
Call Number |
RPLAB @ asmirn @ |
Serial |
557 |
Permanent link to this record |