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Merkel, H. F.; Yagoubov, P. A.; Kroug, M.; Khosropanah, P.; Kollberg, E. L.; Gol’tsman, G. N.; Gershenzon, E. M. |
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Noise temperature and absorbed LO power measurement methods for NbN phonon-cooled hot electron bolometric mixers at terahertz frequencies |
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Conference Article |
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1998 |
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Proc. 28th European Microwave Conf. |
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Proc. 28th European Microwave Conf. |
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1 |
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294-299 |
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NbN HEB mixers |
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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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1580 |
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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. |
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Measured results for NbN phonon-cooled hot electron bolometric mixers at 0.6-0.75 THz, 1.56 THz, and 2.5 THz |
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1998 |
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Proc. 9th Int. Symp. Space Terahertz Technol. |
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Proc. 9th Int. Symp. Space Terahertz Technol. |
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105-114 |
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NbN HEB mixers |
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1587 |
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Floet, D. Wilms; Baselmans, J. J. A.; Klapwijk, T. M.; Gao, J. R. |
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Resistive transition of niobium superconducting hot-electron bolometer mixers |
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1998 |
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Applied Physics Letters |
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Appl. Phys. Lett. |
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73 |
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19 |
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2826 |
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HEB |
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0003-6951 |
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543 |
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Kawamura, Jonathan; Blundell, Raymond; Tong, C.-Y. Edward; Papa, D. Cosmo; Hunter, Todd R.; Gol'tsman, Gregory; Cherednichenko, Sergei; Voronov, Boris; Gershenzon, Eugene |
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First light with an 800 GHz phonon-cooled HEB mixer receiver |
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Conference Article |
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1998 |
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Proc. 9th Int. Symp. Space Terahertz Technol. |
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Proc. 9th Int. Symp. Space Terahertz Technol. |
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35-43 |
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HEB, mixer, LO power, local oscillator power, saturation effect, dynamic range |
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Phonon-cooled superconductive hot-electron bolometric (HEB) mixers are incorporated in a waveguide receiver designed to operate near 800 Gliz. The mixer elements are thin-film nio- bium nitride microbridges with dimensions of 4 nm thickness, 0.2 to 0.3 p.m in length and 2 jun in width. At 780 GHz the best receiver noise temperature is 840 K (DSB). The mixer IF bandwidth is 2.0 GHz, the absorbed LO power is —0.1 1.1W. A fixed-tuned version of the re- ceiver was installed at the Submillimeter Telescope Observatory on Mt. Graham, Arizona, to conduct astronomical observations. These observations represent the first time that a receiver incorporating any superconducting HEB mixer has been used to detect a spectral line of celes- tial origin. |
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Pasadena, California, USA |
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Burke, P. J.; Schoelkopf, R. J.; Prober, D. E.; Skalare, A.; Karasik, B. S.; Gaidis, M. C.; McGrath, W. R.; Bumble, B.; Leduc, H. G. |
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Spectrum of thermal fluctuation noise in diffusion and phonon cooled hot-electron mixers |
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1998 |
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Applied Physics Letters |
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Appl. Phys. Lett. |
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72 |
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12 |
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1516-1518 |
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HEB mixer; thermal fluctuation noise; TFN |
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A systematic study of the intermediate frequency noise bandwidth of Nb thin-film superconducting hot-electron bolometers is presented. We have measured the spectrum of the output noise as well as the conversion efficiency over a very broad intermediate frequency range (from 0.1 to 7.5 GHz) for devices varying in length from 0.08 μm to 3 μm. Local oscillator and rf signals from 8 to 40 GHz were used. For a device of a given length, the spectrum of the output noise and the conversion efficiency behave similarly for intermediate frequencies less than the gain bandwidth, in accordance with a simple thermal model for both the mixing and thermal fluctuation noise. For higher intermediate frequencies the conversion efficiency decreases; in contrast, the noise decreases but has a second contribution which dominates at higher frequency. The noise bandwidth is larger than the gain bandwidth, and the mixer noise is low, between 120 and 530 K (double side band). |
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RPLAB @ gujma @ |
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760 |
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