Records |
Author |
Kroug, M.; Yagoubov, P.; Gol'tsman, G.; Kollberg, E. |
Title |
NbN quasioptical phonon cooled hot electron bolometric mixers at THz frequencies |
Type ![sorted by Type field, descending order (down)](img/sort_desc.gif) |
Conference Article |
Year |
1997 |
Publication |
Inst. Phys. Conf. Ser. |
Abbreviated Journal |
Inst. Phys. Conf. Ser. |
Volume |
1 |
Issue |
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Pages |
405-408 |
Keywords |
NbN HEB mixers |
Abstract |
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Address |
Veldhoven |
Corporate Author |
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Thesis |
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Publisher |
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Place of Publication |
Bristol |
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Edition |
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ISSN |
0951-3248 |
ISBN |
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Medium |
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Area |
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Expedition |
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Conference |
3rd Eur. Conf. on Applied Superconductivity |
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Call Number |
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Serial |
1600 |
Permanent link to this record |
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Author |
Cherednichenko, S.; Yagoubov, P.; Il'In, K.; Gol'tsman, G.; Gershenzon, E. |
Title |
Large bandwidth of NbN phonon-cooled hot-electron bolometer mixers on sapphire substrates |
Type ![sorted by Type field, descending order (down)](img/sort_desc.gif) |
Conference Article |
Year |
1997 |
Publication |
Proc. 8th Int. Symp. Space Terahertz Technol. |
Abbreviated Journal |
Proc. 8th Int. Symp. Space Terahertz Technol. |
Volume |
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Issue |
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Pages |
245-257 |
Keywords |
NbN HEB mixers, fabrication process |
Abstract |
The bandwidth of NbN phonon-cooled hot electron bolometer mixers has been systematically investigated with respect to the film thickness and film quality variation. The films, 2.5 to 10 mm thick, were fabricated on sapphire substrates using DC reactive magnetron sputtering. All devices consisted of several parallel strips, each 1 1.1 wide and 211 long, placed between Ti-Au contact pads. To measure the gain bandwidth we used two identical BWOs operating in the 120-140 GHz frequency range, one functioning as a local oscillator and the other as a signal source. The majority of the measurements were made at an ambient temperature of 4.5 K with optimal LO and DC bias. The maximum 3 dB bandwidth (about 4 GHz) was achieved for the devices made of films which were 2.5-3.5 nm thick, had a high critical temperature, and high critical current density. A theoretical analysis of bandwidth for these mixers based on the two-temperature model gives a good description of the experimental results if one assumes that the electron temperature is equal to the critical temperature. |
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Serial |
276 |
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Author |
Merkel, H. F.; Yagoubov, P. A.; Kroug, M.; Khosropanah, P.; Kollberg, E. L.; Gol’tsman, G. N.; Gershenzon, E. M. |
Title |
Noise temperature and absorbed LO power measurement methods for NbN phonon-cooled hot electron bolometric mixers at terahertz frequencies |
Type ![sorted by Type field, descending order (down)](img/sort_desc.gif) |
Conference Article |
Year |
1998 |
Publication |
Proc. 28th European Microwave Conf. |
Abbreviated Journal |
Proc. 28th European Microwave Conf. |
Volume |
1 |
Issue |
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Pages |
294-299 |
Keywords |
NbN HEB mixers |
Abstract |
In this paper the absorbed LO power requirements and the noise performance of NbN based phonon-cooled hot electron bolometric (HEB) quasioptical mixers are investigated for RF frequencies in the 0.55-1.1 range The minimal measured DSB noise temperatures are about 500 K at 640 GHz, 600 K at 750 GHz, 850 K at 910 GHz and 1250 K at 1.1 THz. The increase in noise temperature at 1.1THz is attributed to water absorption. The absorbed LO power is measured using a calorimetric approach. The results are subsequently corrected for lattice heating. These values are compared to results of a novel one dimensional hot spot mixer models and to a more traditional isotherm method which tends to underestimate the absorbed LO power for small bias powers. Typically a LO power between 50nW and 100nW is needed to pump the device to the optimal operating point. |
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28th European Microwave Conference |
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Call Number |
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Serial |
1580 |
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Author |
Gerecht, E.; Musante, C. F.; Jian, H.; Yngvesson, K. S.; Dickinson, J.; Waldman, J.; Gol'tsman, G. N.; Yagoubov, P. A.; Voronov, B. M.; Gershenzon, E. M. |
Title |
Measured results for NbN phonon-cooled hot electron bolometric mixers at 0.6-0.75 THz, 1.56 THz, and 2.5 THz |
Type ![sorted by Type field, descending order (down)](img/sort_desc.gif) |
Conference Article |
Year |
1998 |
Publication |
Proc. 9th Int. Symp. Space Terahertz Technol. |
Abbreviated Journal |
Proc. 9th Int. Symp. Space Terahertz Technol. |
Volume |
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Issue |
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Pages |
105-114 |
Keywords |
NbN HEB mixers |
Abstract |
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Serial |
1587 |
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Author |
Yagoubov, P.; Kroug, M.; Merkel, H.; Kollberg, E.; Schubert, J.; Hubers, H. W.; Svechnikov, S.; Voronov, B.; Gol'tsman, G.; Wang, Z. |
Title |
Hot electron bolometric mixers based on NbN films deposited on MgO substrates |
Type ![sorted by Type field, descending order (down)](img/sort_desc.gif) |
Conference Article |
Year |
1999 |
Publication |
Inst. Phys. Conf. Ser. |
Abbreviated Journal |
Inst. Phys. Conf. Ser. |
Volume |
167 |
Issue |
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Pages |
687-690 |
Keywords |
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Place of Publication |
Barcelona, Spain |
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Conference |
4th Europ. Conf. on Appl. Superconductivity, Inst. Phys. Conf. Ser. |
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no |
Call Number |
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Serial |
297 |
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