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Author |
Karasik, B. S.; Il'in, K. S.; Pechen, E. V.; Krasnosvobodtsev, S. I. |
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Title |
Diffusion cooling mechanism in a hot-electron NbC microbolometer mixer |
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Journal Article |
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Year |
1996 |
Publication |
Applied Physics Letters |
Abbreviated Journal |
Appl. Phys. Lett. |
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Volume |
68 |
Issue |
16 |
Pages |
2285-2287 |
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Keywords |
HEB mixer, diffusion cooling channel, diffusion channel |
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0003-6951 |
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262 |
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Author |
Semenov, A. D.; Gousev, Y. P.; Nebosis, R. S.; Renk, K. F.; Yagoubov, P.; Voronov, B. M.; Gol’tsman, G. N.; Syomash, V. D.; Gershenzon, E. M. |
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Title |
Heterodyne detection of THz radiation with a superconducting hot‐electron bolometer mixer |
Type |
Journal Article |
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Year |
1996 |
Publication |
Appl. Phys. Lett. |
Abbreviated Journal |
Appl. Phys. Lett. |
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Volume |
69 |
Issue |
2 |
Pages |
260-262 |
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Keywords |
NbN HEB mixers |
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Abstract |
We report on the use of a superconducting hot‐electron bolometer mixer for heterodyne detection of terahertz radiation. Radiation with a wavelength of 119 μm was coupled to the mixer, a NbN microbridge, by a hybrid quasioptical antenna consisting of an extended hyperhemispherical lens and a planar logarithmic spiral antenna. We found, at an intermediate frequency of 1.5 GHz, a system double side band noise temperature of ≊40 000 K and conversion losses of 25 dB. We also discuss the possibilities of further improvement of the mixer performance. |
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0003-6951 |
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1610 |
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Trifonov, V. A.; Karasik, B. S.; Zorin, M. A.; Gol’tsman, G. N.; Gershenzon, E. M.; Lindgren, M.; Danerud, M.; Winkler, D. |
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Title |
9.6 μm wavelength mixing in a patterned YBa2Cu3O7‐δ thin film |
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Journal Article |
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Year |
1996 |
Publication |
Appl. Phys. Lett. |
Abbreviated Journal |
Appl. Phys. Lett. |
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Volume |
68 |
Issue |
10 |
Pages |
1418-1420 |
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Keywords |
YBCO HTS HEB mixers |
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Abstract |
Hot‐electron bolometric (HEB) mixing of 9.6 μm infrared radiation from two lasers in high‐quality YBa2Cu3O7−δ (YBCO) patterned thin film has been demonstrated. A heterodyne measurement showed an intermediate frequency (IF) bandwidth of 18 GHz, limited by our measurement system. An intrinsic limit of 100 GHz is predicted. Between 0.1 and 1 GHz intermediate frequency, temperature fluctuations with an equivalent output noise temperature Tfl up to ∼150 K, contributed to the mixer noise while Johnson noise dominated above 1 GHz. The overall conversion loss at 77 K at low intermediate frequencies was measured to be ∼25 dB, of which 13 dB was due to the coupling loss. The HEB mixer is very promising for use in heterodyne receivers within the whole infrared range. |
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0003-6951 |
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1613 |
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Dickert, F. L.; Haunschild, A.; Kuschow, V.; Reif, M.; Stathopulos, H. |
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Title |
Mass-sensitive detection of solvent vapors. Mechanistic studies on host-guest sensor principles by FT-IR spectroscopy and BET adsorption analysis |
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Journal Article |
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Year |
1996 |
Publication |
Analytical Chemistry |
Abbreviated Journal |
Anal. Chem. |
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Volume |
68 |
Issue |
6 |
Pages |
1058-1061 |
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Keywords |
supramolecular recognition, quartz crystal microbalance, QCM, surface acoustic wave, SAW, mass-sensitive sensor, detector, calixarenes, MM3 force field, Brunauer, Emmett and Teller theory, BET |
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Abstract |
Chemical sensors, based on highly mass sensitive QMB or SAW devices, coated with thin layers of calixarenes, enable the detection of organic solvent vapours, especially halogenated or aromatic hydrocarbons, down to a few ppm. Force field calculations allow the tailoring of these sensor materials seeing that the predicted interaction energies between the host molecules and a large variety of analytes are linearly correlated to the measured sensor effects. These correlations and also BET adsorption analysis prove the analyte recognition properties of these calixarene coatings to be mainly based on host/guest inclusion principles. |
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0003-2700 |
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562 |
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Author |
van de Stadt, H. |
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Title |
An improved 1 THz waveguide mixer |
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Conference Article |
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Year |
1996 |
Publication |
Proc. 7th Int. Symp. Space Terahertz Technol. |
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Pages |
536 |
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Charlottesville, Virginia, USA |
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Probably other authors exist. |
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no |
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263 |
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Author |
Belitsky, V. Yu.; Kollberg, E. L. |
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Title |
Tuning circuit for NbN SIS mixer |
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Conference Article |
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Year |
1996 |
Publication |
Proc. 7th Int. Symp. Space Terahertz Technol. |
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234 |
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Charlottesville, Virginia, USA |
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264 |
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Author |
Yagubov, P.; Gol'tsman, G.; Voronov, B.; Seidman, L.; Siomash, V.; Cherednichenko, S.; Gershenzon, E. |
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Title |
The bandwidth of HEB mixers employing ultrathin NbN films on sapphire substrate |
Type |
Conference Article |
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Year |
1996 |
Publication |
Proc. 7th Int. Symp. Space Terahertz Technol. |
Abbreviated Journal |
Proc. 7th Int. Symp. Space Terahertz Technol. |
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290-302 |
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Keywords |
NbN HEB mixers, fabrication process |
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We report on some unusual features observed during fabrication of ultrathin NbN films with high Tc. The films were used to fabricate HEB mixers, which were evaluated for IF bandwidth measurements at 140 GHz. Ultrathin films were fabricated using reactive dc magnetron sputtering with a discharge current source. Reproducible parameters of the films are assured keeping constant the difference between the discharge voltage in pure argon, and in a gas mixture, for the same current. A maximum bandwidth of 4 GHz at optimal LO and dc bias was obtained for mixer chip based on NbN film 35 A thick with Tc = 11 K. |
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Charlottesville, Virginia, USA |
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266 |
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Author |
Ellison, B. N.; Maddison, B. J.; Matheson, D. N.; Oldfield, M. L.; Marazita, S.; Crowe, T. W.; Maaskant, P.; Kelly, W. M. |
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Title |
First results for a 2.5 THz Schottky diode waveguide mixer |
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Conference Article |
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Year |
1996 |
Publication |
Proc. 7th Int. Symp. Space Terahertz Technol. |
Abbreviated Journal |
Proc. 7th Int. Symp. Space Terahertz Technol. |
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Volume |
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Pages |
494 |
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Charlottesville, Virginia, USA |
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265 |
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Author |
Betz, A. L.; Borejko, R. T. |
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Title |
A practical Schottky mixer for 5 THz |
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Conference Article |
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1996 |
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Proc. 7th Int. Symp. Space Terahertz Technol. |
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503 |
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269 |
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Author |
Carlstrom, John E.; Jonas Zmuidzinas |
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Title |
Millimeter and Submillimeter Techniques |
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1996 |
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848 |
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Oxford University Press Inc |
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New York |
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Review of radio science 1993–1996 |
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34 |
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Published for the International Union of Radio Science |
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268 |
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