Records |
Author |
Elant'ev, A. I.; Karasik, B. S. |
Title |
Effect of high-frequency current on Nb superconductive film in resistive state |
Type |
Journal Article |
Year |
1989 |
Publication |
Sov. J. Low Temp. Phys. |
Abbreviated Journal |
Sov. J. Low Temp. Phys. |
Volume |
15 |
Issue |
7 |
Pages |
379-383 |
Keywords |
Nb HEB |
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882 |
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Author |
Kooi, Jacob Willem |
Title |
Advanced receivers for submillimeter and far infrared astronomy |
Type |
Book Whole |
Year |
2008 |
Publication |
University of Groningen |
Abbreviated Journal |
RUG |
Volume |
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Issue |
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Pages |
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Keywords |
HEB, SIS, TES, NEP, noise temperature, IF bandwidth, waveguide, impedance, conversion gain, FTS, integrated array, stability, Allan variance, multi-layer antireflection coating |
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Doctoral thesis |
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ISBN |
978-90-367-3653-4 |
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881 |
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Author |
Shurakov, Alexander; Tong, Edward; Blundell, Raymond; Gol'tsman, Gregory |
Title |
Microwave stabilization of HEB mixer by a microchip controller |
Type |
Conference Article |
Year |
2012 |
Publication |
IEEE MTT-S international microwave symposium digest |
Abbreviated Journal |
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Volume |
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Issue |
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Pages |
1-3 |
Keywords |
HEB mixer stability, microwave injection, Allan variance, Allan time |
Abstract |
The stability of a Hot Electron Bolometer (HEB) mixer can be improved by the use of microwave injection. In this article we report a refinement of this approach. We introduce a microchip controller to facilitate the implementation of the stabilization scheme, and demonstrate that the feedback loop effectively suppresses drifts in the HEB bias current, leading to an improvement in the receiver stability. The measured Allan time of the mixer's IF output power is increased to > 10 s. |
Address |
Montreal, QC, Canada |
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857 |
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Author |
Il'in, K. S.; Lindgren, M.; Currie, M. A.; Semenov, D.; Gol'tsman, G. N.; Sobolewski, Roman; Cherednichenko, S. I.; Gershenzon, E. M. |
Title |
Picosecond hot-electron energy relaxation in NbN superconducting photodetectors |
Type |
Journal Article |
Year |
2000 |
Publication |
Appl. Phys. Lett. |
Abbreviated Journal |
Appl. Phys. Lett. |
Volume |
76 |
Issue |
19 |
Pages |
2752-2754 |
Keywords |
NbN HEB detectors, two-temperature model, IF bandwidth |
Abstract |
We report time-resolved characterization of superconducting NbN hot-electron photodetectors using an electro-optic sampling method. Our samples were patterned into micron-size microbridges from 3.5-nm-thick NbN films deposited on sapphire substrates. The devices were illuminated with 100 fs optical pulses, and the photoresponse was measured in the ambient temperature range between 2.15 and 10.6 K (superconducting temperature transition TC). The experimental data agreed very well with the nonequilibrium hot-electron, two-temperature model. The quasiparticle thermalization time was ambient temperature independent and was measured to be 6.5 ps. The inelastic electron–phonon scattering time Ï„e–ph tended to decrease with the temperature increase, although its change remained within the experimental error, while the phonon escape time Ï„es decreased almost by a factor of two when the sample was put in direct contact with superfluid helium. Specifically, Ï„e–ph and Ï„es, fitted by the two-temperature model, were equal to 11.6 and 21 ps at 2.15 K, and 10(±2) and 38 ps at 10.5 K, respectively. The obtained value of Ï„e–ph shows that the maximum intermediate frequency bandwidth of NbN hot-electron phonon-cooled mixers operating at TC can reach 16(+4/–3) GHz if one eliminates the bolometric phonon-heating effect. |
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ISSN |
0003-6951 |
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856 |
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Author |
Kawakami, A; Saito, S.; Hyodo, M. |
Title |
Fabrication of nano-antennas for superconducting Infrared detectors |
Type |
Journal Article |
Year |
2011 |
Publication |
IEEE Trans. Appl. Supercond. |
Abbreviated Journal |
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Volume |
21 |
Issue |
3 |
Pages |
632-635 |
Keywords |
optical antennas, NbN/MgO/NbN/TiN/Al HEB, dipole antennas, IR, infrared |
Abstract |
To improve the response performance of superconducting infrared detectors, we have developed a fabrication process for nano-antennas. A nano-antenna consists of a dipole antenna, and a superconducting thin film strip placed in the antenna's center. By measuring the transition temperature of the superconducting strips, we confirmed that their superconductivity maintained a good condition after the nano-antenna fabrication process. We also evaluated nano-antenna characteristics using Fourier transform infrared spectroscopy. The evaluated antenna length and width were respectively set at around 2400 nm and 400 nm, and the antennas were placed at intervals of several micrometers around the area of 1 mm2 . In an evaluation of spectral transmission characteristics, clear absorption caused by antenna effects was observed at around 1400 cm-1. High polarization dependencies were also observed. |
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761 |
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