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| Author |
Bruderer, S.; Benz, A. O.; van Dishoeck, E. F.; Melchior, M.; Doty, S. D.; van der Tak, F.; Stäuber, P.; Wampfler, S. F.; Dedes, C.; Yıldız, U. A.; Pagani, L.; Giannini, T.; de Graauw, Th.; Whyborn, N.; Teyssier, D.; Jellema, W.; Shipman, R.; Schieder, R.; Honingh, N.; Caux, E.; Bächtold, W.; Csillaghy, A.; Monstein, C.; Bachiller, R.; Baudry, A.; Benedettini, M.; Bergin, E.; Bjerkeli, P.; Blake, G. A.; Bontemps, S.; Braine, J.; Caselli, P.; Cernicharo, J.; Codella, C.; Daniel, F.; di Giorgio, A. M.; Dominik, C.; Encrenaz, P.; Fich, M.; Fuente, A.; Goicoechea, J. R.; Helmich, F.; Herczeg, G. J.; Herpin, F.; Hogerheijde, M. R.; Jacq, T.; Johnstone, D.; Jørgensen, J. K.; Kristensen, L. E.; Larsson, B.; Lis, D.; Liseau, R.; Marseille, M.; McCoey, C.; Melnick, G.; Neufeld, D.; Nisini, B.; Olberg, M.; Parise, B.; Pearson, J. C.; Plume, R.; Risacher, C.; Santiago-García, J.; Saraceno, P.; Shipman, R.; Tafalla, M.; van Kempen, T. A.; Visser, R.; Wyrowski, F. |
| Title |
Herschel/HIFI detections of hydrides towards AFGL 2591. Envelope emission versus tenuous cloud absorption |
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Journal Article |
| Year |
2010 |
Publication |
Astron. Astrophys. |
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| Volume |
521 |
Issue |
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Pages |
L44 (1 to 7) |
| Keywords |
HEB mixer applications, HIFI, Herschel |
| Abstract |
The Heterodyne Instrument for the Far Infrared (HIFI) onboard the Herschel Space Observatory allows the first observations of light diatomic molecules at high spectral resolution and in multiple transitions. Here, we report deep integrations using HIFI in different lines of hydrides towards the high-mass star forming region AFGL 2591. Detected are CH, CH+, NH, OH+, H2O+, while NH+ and SH+ have not been detected. All molecules except for CH and CH+ are seen in absorption with low excitation temperatures and at velocities different from the systemic velocity of the protostellar envelope. Surprisingly, the CH(JF,P = 3/22,- – 1/21,+ ) and CH+(J = 1–0, J = 2–1) lines are detected in emission at the systemic velocity. We can assign the absorption features to a foreground cloud and an outflow lobe, while the CH and CH+ emission stems from the envelope. The observed abundance and excitation of CH and CH+ can be explained in the scenario of FUV irradiated outflow walls, where a cavity etched out by the outflow allows protostellar FUV photons to irradiate and heat the envelope at larger distances driving the chemical reactions that produce these molecules. |
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1083 |
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| Author |
Gol'tsman, G. N.; Loudkov, D. N. |
| Title |
Terahertz superconducting hot-electron bolometer mixers and their application in radio astronomy |
Type |
Journal Article |
| Year |
2003 |
Publication |
Radiophys. Quant. Electron. |
Abbreviated Journal |
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| Volume |
46 |
Issue |
8/9 |
Pages |
604-617 |
| Keywords |
NbN HEB mixers |
| Abstract |
We review the latest developments, research, and radioastronomy applications of hot-electron bolometer (HEB) mixers operated in the terahertz waveband. The physical principles of operation of terahertz HEB mixers are presented, their manufacturing from ultrathin NbN films, the main HEB-mixer parameters and their measurement techniques are discussed, and practical terahertz radioastronomy projects based on heterodyne receivers with HEB mixers are considered. |
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0033-8443 |
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UDC 537.312.62 |
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472 |
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Гольцман, Г.Н.; Лудков, Д.Н. |
| Title |
Сверхпроводниковые смесители на горячих электронах терагерцового диапазона и их применение в радиоастрономии |
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Journal Article |
| Year |
2003 |
Publication |
Изв. высших учебных заведений. Радиофизика |
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46 |
Issue |
8/9 |
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HEB, mixers |
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russian |
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RPLAB @ s @ |
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473 |
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| Author |
Vystavkin, A. N. |
| Title |
Estimation of noise equivalent power and design analysis of an andreev reflection hot-electron microbolometer for submillimeter radioastronomy |
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Journal Article |
| Year |
1999 |
Publication |
Rus. J. Radio Electron. |
Abbreviated Journal |
Rus. J. Radio Electron. |
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Issue |
10 |
Pages |
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| Keywords |
HEB, detector, bolometer |
| Abstract |
Results of theoretical estimations and measurements of characteristics of an Andreev reflection hot-electron microbolometer for submillimeter radioastronomy made by different researchers are reviewed and analysed. Peculiarities and characteristics of the microbolometers using two types of microthermometer for measurement of the electron temperature increment under influence of the radiation: the SIN-junction and the transition-edge sensor (TES) with electrothermal feedback – are compared. Advantages of the microbolometer with the second type of the microthermometer when the TES is used simultaneously as the absorber of radiation are shown. Methods of achievement of the best noise equivalent power of the microbolometer in such version as well as methods of the matching the microbolometer with the incident radiation flow using planar antennas and with the channel of output signal measurement using a SQUID-picoammeter are considered. |
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496 |
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Semenov, A. D.; Il'in, K.; Siegel, M.; Smirnov, A.; Pavlov, S.; Richter, H.; Hübers, H.-W. |
| Title |
Evidence of non-bolometric mixing in the bandwidth of a hot-electron bolometer |
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Journal Article |
| Year |
2006 |
Publication |
Superconductor Science and Technology |
Abbreviated Journal |
Supercond. Sci. Technol. |
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19 |
Issue |
10 |
Pages |
1051-1056 |
| Keywords |
HEB |
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0953-2048 |
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536 |
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Semenov, Alexei D.; Richter, Heiko; Hubers, Heinz-Wilhelm; Gunther, Burghardt.; Smirnov, Andrey; Il'in, Konstantin S.; Siegel, Michael; Karamarkovic, Jugoslav P. |
| Title |
Terahertz performance of integrated lens antennas with a hot-electron bolometer |
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Journal Article |
| Year |
2007 |
Publication |
IEEE Trans. Microw. Theory Techn. |
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55 |
Issue |
2 |
Pages |
239-247 |
| Keywords |
HEB, lens antenna |
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0018-9480 |
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no |
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538 |
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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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1051-8223 |
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no |
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546 |
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Uzawa, Y.; Miki, S.; Wang, Z.; Kawakami, A.; Kroug, M.; Yagoubov, P.; Kollberg, E. |
| Title |
Performance of a quasi-optical NbN hot-electron bolometric mixer at terahertz frequencies |
Type |
Journal Article |
| Year |
2002 |
Publication |
Superconductor Science and Technology |
Abbreviated Journal |
Supercond. Sci. Technol. |
| Volume |
15 |
Issue |
1 |
Pages |
141-145 |
| Keywords |
HEB, mixer |
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0953-2048 |
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RPLAB @ s @ |
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548 |
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| Author |
Cherednichenko, S.; Drakinskiy, V. |
| Title |
Low noise hot-electron bolometer mixers for terahertz frequencies |
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Journal Article |
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2008 |
Publication |
J. Low Temp. Phys. |
Abbreviated Journal |
J. Low Temp. Phys. |
| Volume |
151 |
Issue |
1-2 |
Pages |
575-579 |
| Keywords |
HEB, mixer, gain bandwidth, MgB2 |
| Abstract |
Hot-electron bolometer (HEB) mixers are used in many low noise heterodyne radio astronomical receivers. Their noise temperature is at the level of 10–15 times the quantum limit. However, their gain bandwidth is a serious limiting factor. Here we review the state of the art of the HEB mixers gain bandwidth for different materials and substrates. We compare the gain bandwidth of HEB mixers made on bulk substrates and thin membranes. Finally, results for MgB2 thin films for broadband HEB mixers are discussed. |
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0022-2291 |
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RPLAB @ lobanovyury @ |
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553 |
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Schwaab, G.W.; Sirmain, G.; Schubert, J.; Hubers, H.-W.; Gol'tsman, G.; Cherednichenko, S.; Verevkin, A.; Voronov, B.; Gershenzon, E. |
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Investigation of NbN phonon-cooled HEB mixers at 2.5 THz |
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Journal Article |
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1999 |
Publication |
IEEE Trans. Appl. Supercond. |
Abbreviated Journal |
IEEE Trans. Appl. Supercond. |
| Volume |
9 |
Issue |
2 |
Pages |
4233-4236 |
| Keywords |
NbN HEB mixers |
| Abstract |
The development of superconducting hot electron bolometric (HEB) mixers has been a big step forward in the direction of quantum noise limited mixer performance at THz frequencies. Such mixers are crucial for the upcoming generation of airborne and spaceborne THz heterodyne receivers. In this paper we report on new results on a phonon-cooled NbN HEB mixer using e-beam lithography. The superconducting film is 3 nm thick. The mixer is 0.2 μm long and 1.5 μm wide and it is integrated in a spiral antenna on a Si substrate. The device is quasi-optically coupled through a Si lens and a dielectric beam combiner to the radiation of an optically pumped FIR ring gas laser cavity. The performance of the mixer at different THz frequencies from 0.69 to 2.55 THz with an emphasis on 2.52 THz is demonstrated. At 2.52 THz minimum DSB noise temperatures of 4200 K have been achieved at an IF of 1.5 GHz and a bandwidth of 40 MHz with the mixer mounted in a cryostat and a 0.8 m long signal path in air. |
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1051-8223 |
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550 |
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