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| Author | Hübers, H.-W.; Semenov, A. D.; Richter, H.; Schubert, J.; Hadjiloucas, S.; Bowen, J. W.; Gol'tsman, G.; Voronov, B. M.; Gershenzon, E. M. | ||||
| Title | Antenna pattern of the quasi-optical hot-electron bolometric mixer at terahertz frequencies | Type | Conference Article | ||
| Year | 2001 | Publication | Proc. 12th Int. Symp. Space Terahertz Technol. | Abbreviated Journal | Proc. 12th Int. Symp. Space Terahertz Technol. |
| Volume | Issue  |
Pages | 286-296 | ||
| Keywords | NbN HEB mixers | ||||
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| Publisher | Place of Publication | San Diego, CA, USA | Editor | ||
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| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | Serial | 323 | |||
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| Author | Huebers, H.-W.; Semenov, A.; Richter, H.; Birk, M.; Krocka, M.; Mair, U.; Smirnov, K.; Gol’tsman, G. N.; Voronov, B. M. | ||||
| Title | Superconducting hot electron bolometer as mixer for far-infrared heterodyne receivers | Type | Conference Article | ||
| Year | 2003 | Publication | Proc. SPIE | Abbreviated Journal | Proc. SPIE |
| Volume | 4855 | Issue |
Pages | 395-401 | |
| Keywords | NbN HEB mixers | ||||
| Abstract | Heterodyne receivers for applications in astronomy need quantum limited sensitivity. In instruments which are currently under development for SOFIA or Herschel superconducting hot electron bolometers (HEB) will be used to achieve this goal at frequencies above 1.4 THz. We present results of the development of a phonon-cooled NbN HEB mixer for GREAT, the German Receiver for Astronomy at Terahertz Frequencies, which will be flown aboard SOFIA. The mixer is a small superconducting bridge incorporated in a planar feed antenna and a hyperhemispherical lens. Mixers with logarithmic-spiral and double-slot feed antennas have been investigated with respect to their noise temperature, conversion loss, linearity and beam pattern. At 2.5 THz a double sideband noise temperature of 2200 K was achieved. The conversion loss was 17 dB. The response of the mixer was linear up to 400 K load temperature. The performance was verified by measuring an emission line of methanol at 2.5 THz. The measured linewidth is in good agreement with the linewidth deduced from pressure broadening measurements at millimeter wavelength. The results demonstrate that the NbN HEB is very well suited as a mixer for far-infrared heterodyne receivers. | ||||
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| Publisher | SPIE | Place of Publication | Tucson, USA | Editor | Phillips, T. G.; Zmuidzinas, J. |
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| Series Editor | Series Title | Presented at the Society of Photo-Optical Instrumentation Engineers (SPIE) Conference | Abbreviated Series Title | ||
| Series Volume | 4855 | Series Issue | Edition | ||
| ISSN | ISBN | Medium | |||
| Area | Expedition | Conference | Millimeter and Submillimeter Detectors for Astronomy | ||
| Notes | Approved | no | |||
| Call Number | Serial | 335 | |||
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| Author | Cherednichenko, S.; Drakinskiy, V.; Baubert, J.; Lecomte, B.; Dauplay, F.; Krieg, J. M.; Delorme, Y.; Feret, A.; Hübers, H. W.; Semenov, A. D.; Gol'tsman, G. N. | ||||
| Title | 2.5 THz multipixel heterodyne receiver based on NbN HEB mixers | Type | Conference Article | ||
| Year | 2006 | Publication | Proc. SPIE | Abbreviated Journal | Proc. SPIE |
| Volume | 6275 | Issue |
Pages | 62750I (1 to 11) | |
| Keywords | HEB, mixer, membrane | ||||
| Abstract | A 16 pixel heterodyne receiver for 2.5 THz has been developed based on NbN superconducting hot-electron bolometer (HEB) mixers. The receiver uses a quasioptical RF coupling approach where HEB mixers are integrated into double dipole antennas on 1.5 µm thick Si3N4/SiO2 membranes. Spherical mirrors (one per pixel) and backshort distance from the antenna have been used to design the output mixer beam profile. The camera design allows all 16 pixel IF readout in parallel. The gain bandwidth of the HEB mixers on Si3N4/SiO2 membranes was found to be 0.7÷0.9 GHz, which is much smaller than for similar devices on silicon. Application of buffer layers and use of alternative types of membranes (e.g. silicon-on-insulator) is under investigation. | ||||
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| Notes | Approved | no | |||
| Call Number | Serial | 561 | |||
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| Author | Nebosis, R. S.; Semenov, A. D.; Gousev, Yu. P.; Renk, K. F. | ||||
| Title | Rigorous analysis of a superconducting hot-electron bolometer mixer: theory and comparision with experiment | Type | Conference Article | ||
| Year | 1996 | Publication | Proc. 7th Int. Symp. Space Terahertz Technol. | Abbreviated Journal | |
| Volume | Issue |
Pages | 601-613 | ||
| Keywords | HEB mixer, model, conversion gain, noise temperature, impedance, 2.5 THz | ||||
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| Publisher | Place of Publication | Charlottesville, Virginia, USA | Editor | ||
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| Notes | Approved | no | |||
| Call Number | Serial | 605 | |||
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| Author | Henrich, D.; Dorner,S.; Hofherr, M.; Il'in, K.; Semenov, A.; Heintze, E.; Scheffler, M.; Dressel, M.; Siegel, M. | ||||
| Title | Broadening of hot-spot response spectrum of superconducting NbN nanowire single-photon detector with reduced nitrogen content | Type | Journal Article | ||
| Year | 2012 | Publication | Abbreviated Journal | J. Appl. Phys. | |
| Volume | 112 | Issue |
Pages | ||
| Keywords | SSPD, SNSPD, magnetron sputtering, spectrum, NbN film, nitrogen concentration | ||||
| Abstract | The spectral detection efficiency and the dark count rate of superconducting nanowire single-photon detectors (SNSPD) have been studied systematically on detectors made from thin NbN films with different chemical compositions. Reduction of the nitrogen content in the 4 nm thick NbN films results in a decrease of the dark count rates more than two orders of magnitude and in a red shift of the cut-off wavelength of the hot-spot SNSPD response. The observed phenomena are explained by an improvement of uniformity of NbN films that has been confirmed by a decrease of resistivity and an increase of the ratio of the measured critical current to the depairing current. The latter factor is considered as the most crucial for both the cut-off wavelength and the dark count rates of SNSPD. Based on our results we propose a set of criteria for material properties to optimize SNSPD in the infrared spectral region. VC 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4757625] |
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| Corporate Author | D. Henrich, S. Dorner, M. Hofherr, K. Il'in, A. Semenov, E. Heintze, M. Scheffler, M. Dressel, M. Siegel | Thesis | |||
| Publisher | Place of Publication | Editor | |||
| Language | English | Summary Language | Original Title | Broadening of hot-spot response spectrum of superconducting NbN nanowire single-photon detector with reduced nitrogen content | |
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| Notes | Approved | no | |||
| Call Number | RPLAB @ seleznev @ | Serial | 877 | ||
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