| Records |
| Author |
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. |
| Title |
Mixing and noise in diffusion and phonon cooled superconducting hot-electron bolometers |
Type |
Journal Article |
| Year |
1999 |
Publication |
J. Appl. Phys. |
Abbreviated Journal |
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| Volume |
85 |
Issue |
3 |
Pages |
1644-1653 |
| Keywords |
HEB, mixer |
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0021-8979 |
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no |
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556 |
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| Author |
Cherednichenko, S.; Drakinskiy, V.; Baubert, J.; Krieg, J.-M.; Voronov, B.; Gol'tsman, G.; Desmaris, V. |
| Title |
Gain bandwidth of NbN hot-electron bolometer terahertz mixers on 1.5 μm Si3N4 / SiO2 membranes |
Type |
Journal Article |
| Year |
2007 |
Publication |
J. Appl. Phys. |
Abbreviated Journal |
J. Appl. Phys. |
| Volume |
101 |
Issue |
12 |
Pages |
124508 (1 to 6) |
| Keywords |
HEB, mixer, membrane |
| Abstract |
The gain bandwidth of NbN hot-electron bolometer terahertz mixers on electrically thin Si3N4/SiO2 membranes was experimentally investigated and compared with that of HEB mixers on bulk substrates. A gain bandwidth of 3.5 GHz is achieved on bulk silicon, whereas the gain bandwidth is reduced down to 0.6–0.9 GHz for mixers on 1.5 μm Si3N4/SiO2 membranes. We show that application of a MgO buffer layer on the membrane extends the gain bandwidth to 3 GHz. The experimental data were analyzed using the film-substrate acoustic mismatch approach. |
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0021-8979 |
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560 |
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| Author |
Meledin, Denis; Pavolotsky, Alexey; Desmaris, Vincent.; Lapkin, Igor; Risacher, Christophe; Perez, Victor; Henke, Douglas; Nystrom, Olle; Sundin, Erik; Dochev, Dimitar; Pantaleev, Miroslav; Fredrixon, Mathias; Strandberg, Magnus; Voronov, Boris; Goltsman, Gregory; Belitsky, Victor |
| Title |
A 1.3-THz balanced waveguide HEB mixer for the APEX telescope |
Type |
Journal Article |
| Year |
2009 |
Publication |
IEEE Trans. Microw. Theory Techn. |
Abbreviated Journal |
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| Volume |
57 |
Issue |
1 |
Pages |
89-98 |
| Keywords |
HEB, mixer, waveguide, balanced, NbN |
| Abstract |
In this paper, we report about the development, fabrication, and characterization of a balanced waveguide hot electron bolometer (HEB) receiver for the Atacama Pathfinder EXperiment telescope covering the frequency band of 1.25–1.39 THz. The receiver uses a quadrature balanced scheme and two HEB mixers, fabricated from 4- to 5-nm-thick NbN film deposited on crystalline quartz substrate with an MgO buffer layer in between. We employed a novel micromachining method to produce all-metal waveguide parts at submicrometer accuracy (the main-mode waveguide dimensions are 90×180 μm). We present details on the mixer design and measurement results, including receiver noise performance, stability and “first-light†at the telescope site. The receiver yields a double-sideband noise temperature averaged over the RF band below 1200 K, and outstanding stability with a spectroscopic Allan time more than 200 s. |
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0018-9480 |
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RPLAB @ lobanovyury @ |
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554 |
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Cherednichenko, Sergey; Drakinskiy, Vladimir; Berg, Therese; Kollberg, Erik L.; Angelov, Iltcho |
| Title |
The direct detection effect in the hot-electron bolometer mixer sensitivity calibration |
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Journal Article |
| Year |
2007 |
Publication |
IEEE Trans. Microw. Theory Techn. |
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| Volume |
55 |
Issue |
3 |
Pages |
504-510 |
| Keywords |
HEB, mixer, direct detection effect |
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0018-9480 |
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no |
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RPLAB @ lobanovyury @ |
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555 |
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| Author |
Siddiqi, I.; Prober, D. E. |
| Title |
Nb–Au bilayer hot-electron bolometers for low-noise THz heterodyne detection |
Type |
Journal Article |
| Year |
2004 |
Publication |
Applied Physics Letters |
Abbreviated Journal |
Appl. Phys. Lett. |
| Volume |
84 |
Issue |
8 |
Pages |
1404 |
| Keywords |
HEB, mixers, dynamic range, saturation, LO power, local oscillator power, Nb |
| Abstract |
The sensitivity of present Nb diffusion-cooled hot-electron bolometer (HEB) mixers is not quantum limited, and can be improved by reducing the superconducting transition temperature TC. Lowering TC reduces thermal fluctuations, resulting in a decrease of the mixer noise temperature TM. However, lower TC mixers have reduced dynamic range and saturate more easily due to background noise. We present 30 GHz microwave measurements on a bilayer HEB system, Nb–Au, in which TC can be tuned with Au layer thickness to obtain the maximum sensitivity for a given noise background. These measurements are intended as a guide for the optimization of THz mixers. Using a Nb–Au mixer with TC = 1.6 K, we obtain TM = 50 K with 2 nW of local oscillator (LO) power. Good mixer performance is observed over a wide range of LO power and bias voltage and such a device should not exhibit saturation in a THz receiver. |
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0003-6951 |
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no |
| Call Number |
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Serial |
571 |
| Permanent link to this record |
