Records |
Author |
Galin, I.; Schnitzer, C. A.; Dengler, R. J.; Quintero, O. |
Title |
177–207 GHz radiometer front end, single–side–band measurements |
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Conference Article |
Year |
1999 |
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Proc. 10th Int. Symp. Space Terahertz Technol. |
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70 |
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Charlottesville, Virginia, USA |
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RPLAB @ s @ schottky_Tn_1000_at_0p2THz |
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289 |
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Author |
Marazita, St.even M.; Kai Hui; Hesler, Jeffrey L.; Bishop, William L.; Crowe, Thomas W. |
Title |
Progress in submillimeter wavelength integrated mixer technology |
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Conference Article |
Year |
1999 |
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Proc. 10th Int. Symp. Space Terahertz Technol. |
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74 |
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Charlottesville, Virginia |
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RPLAB @ s @ schottky_Tn_2970_at_0p69THz |
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290 |
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Author |
Hesler, Jeffrey L.; Hui, Kai; Crowe, Thomas W. |
Title |
A fixed–tuned 400 GHz subharmonic mixer using planar Schottky diods |
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Conference Article |
Year |
1999 |
Publication |
Proc. 10th Int. Symp. Space Terahertz Technol. |
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95 |
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Charlottesville, Virginia, USA |
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RPLAB @ s @ schottky_Tn_1120_at_0p42THz |
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291 |
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Author |
Merkel, H.; Khosropanah, P.; Yagubov, P.; Kollberg, E. |
Title |
A hot spot mixer model for superconducting phonone–cooled HEB far above the quasipartical band gap |
Type |
Conference Article |
Year |
1999 |
Publication |
Proc. 10th Int. Symp. Space Terahertz Technol. |
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592-606 |
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Charlottesville, Virginia |
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292 |
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Wyss, R. A.; Karasik, B. S.; McGrath, W. R.; Bamble, B.; LeDuc, H. |
Title |
Noise and bandwidth measurements of diffusion–cooled Nb hot–electron bolometer mixers at frequencies above the superconductive energy gap |
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Conference Article |
Year |
1999 |
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Proc. 10th Int. Symp. Space Terahertz Technol. |
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215-229 |
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Charlottesville, Virginia |
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RPLAB @ s @ qoheb_Tn_1250_at_1p1 |
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293 |
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Author |
Ynvesson, K. Sigfrid; Kollberg, Erik L. |
Title |
Optimum receiver noise temperature for NbN HEB mixers according to standard model |
Type |
Conference Article |
Year |
1999 |
Publication |
Proc. 10th Int. Symp. Space Terahertz Technol. |
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566-582 |
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HEB mixer model, standard model, electro-thermal feedback, self-heating parameter, heating efficiency |
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895 |
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Gerecht, E.; Musante, C. F.; Jian, H.; Zhuang, Y.; Yngvesson, K. S.; Dickinson, J.; Goyette, T.; Waldman, J.; Yagoubov, P. A.; Gol'tsman, G. N.; Voronov, B. M.; Gershenzon, E. M. |
Title |
Improved characteristics of NbN HEB mixers integrated with log-periodic antennas |
Type |
Conference Article |
Year |
1999 |
Publication |
Proc. 10th Int. Symp. Space Terahertz Technol. |
Abbreviated Journal |
Proc. 10th Int. Symp. Space Terahertz Technol. |
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Pages |
200-207 |
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NbN HEB mixers |
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1574 |
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Schwaab, G. W.; Hübers, H.-W.; Schubert, J.; Erichsen, Patrik; Gol'tsman, G.; Semenov, A.; Verevkin, A.; Cherednichenko, S.; Gershenzon, E. |
Title |
A high resolution spectrometer for the investigation of molecular structures in the THZ range |
Type |
Conference Article |
Year |
1999 |
Publication |
Proc. 10th Int. Symp. Space Terahertz Technol. |
Abbreviated Journal |
Proc. 10th Int. Symp. Space Terahertz Technol. |
Volume |
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Issue |
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Pages |
530-538 |
Keywords |
antireflection coatings, dielectric mirrors |
Abstract |
A status report on the design study of a novel tunable far-infrared (TuFTR) spectrometer for the investigation of the structure of weakly bound molecular complexes is given. The goal is a sensitive TuFIR spectrometer with full frequency coverage from 1-6 THz. To hit the goal, advanced sources (e.g. p-Ge lasers) and detectors (e.g. superconducting hot electron bolometric (HEB) mixers) shall be employed to extend the technique of cavity ringdown spectroscopy, that is currently used at optical and infrared frequencies to the FIR spectral range. Critical for such a system are high-Q resonators that still allow good optical coupling, and wideband antireflection coatings to increase detector sensitivity and decrease optical path losses. 2 nd order effective media theory and an iterative multilayer algorithm have been employed to design wideband antireflection coatings for dielectrics with large dielectric constants like Ge or Si. Taking into account 6 layers, for Si bandwidths of 100% of the center frequency could be obtained with power reflectivities below 1% for both polarizations simultaneously. Wideband dielectric mirrors including absorption losses were also studied yielding a bandwidth of about 50% with reflectivities larger than 99.5%. |
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1577 |
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Author |
Cherednichenko, S.; Ronnung, F.; Gol'tsman, G.; Gershenzon, E.; Winkler, D. |
Title |
YBa2Cu3O7-δ hot-electron bolometer with submicron dimensions |
Type |
Conference Article |
Year |
1999 |
Publication |
Proc. 10th Int. Symp. Space Terahertz Technol. |
Abbreviated Journal |
Proc. 10th Int. Symp. Space Terahertz Technol. |
Volume |
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Pages |
181-189 |
Keywords |
YBCO HTS HEB mixers |
Abstract |
Photoresponse of YBa2Cu3O7-δ hot-electron bolometers to modulated near-infrared radiation was studied at a modulation .frequenc y var y ing from 0.2 MHz to 2 GHz. Bolometers were _fabricated from a 50 12 M thick film and had in-plane areas of 10x10 , um 2 . 2x0.2 s um', 1x0.2 p.m', and 0.5x0.2 jim. We found that nonequilibrium phonons cool down more effectively for the bolometers with smaller area. For the smallest bolometer the bolometric component in the response is 10 dB less than for the largest one. |
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1572 |
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Yagoubov, P.; Kroug, M.; Merkel, H.; Kollberg, E.; Hübers, H.-W.; Schubert, J.; Schwaab, G.; Gol'tsman, G.; Gershenzon, E. |
Title |
NbN hot electron bolometric mixers at frequencies between 0.7 and 3.1 THz |
Type |
Conference Article |
Year |
1999 |
Publication |
Proc. 10th Int. Symp. Space Terahertz Technol. |
Abbreviated Journal |
Proc. 10th Int. Symp. Space Terahertz Technol. |
Volume |
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Issue |
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Pages |
238-246 |
Keywords |
NbN HEB mixers |
Abstract |
The performance of NbN based phonon-cooled Hot Electron Bolometric (HEB) quasioptical mixers is investigated in the 0.7-3.1 THz frequency range. The devices are made from a 3.5-4 nm thick NbN film on high resistivity Si and integrated with a planar spiral antenna on the same substrate. The length of the bolometer microbridge is 0.1- 0.2 gm, the width is 1-2 gm. The best results of the DSB receiver noise temperature measured at 1.5 GHz intermediate frequency are: 800 K at 0.7 THz, 1100 K at 1.6 THz, 2000 K at 2.5 THz and 4200 K at 3.1 THz. The measurements were performed with a far infrared laser as the local oscillator (LO) source. The estimated LO power required is less than 500 nW at the receiver input. First results on the spiral antenna polarization measurements are reported. |
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1575 |
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