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Author |
Semenov, A.; Goltsman, G.; Korneev, A. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Quantum detection by current carrying superconducting film |
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Journal Article |
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Year |
2001 |
Publication |
Phys. C: Supercond. |
Abbreviated Journal |
Phys. C: Supercond. |
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Volume |
351 |
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4 |
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349-356 |
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quantum detection, phase slip centers, quasiparticle diffusion |
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We describe a novel quantum detection mechanism in the superconducting film carrying supercurrent. The mechanism incorporates growing normal domain and breaking of superconductivity by the bias current. A single photon absorbed in the film creates transient normal spot that causes redistribution of the current and, consequently, increase of the current density in superconducting areas. When the current density exceeds the critical value, the film switches into resistive state and generates the voltage pulse. Analysis shows that a submicron-wide film of conventional low temperature superconductor operated in liquid helium may detect single far-infrared photon. The amplitude and duration of the voltage pulse are in the millivolt and picosecond range, respectively. The quantitative model is presented that allows simulation of the detector utilizing this detection mechanism. |
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0921-4534 |
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507 |
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Hübers, H.-W.; Schubert, J.; Krabbe, A.; Birk, M.; Wagner, G.; Semenov, A.; Gol’tsman, G.; Voronov, B.; Gershenzon, E. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Parylene anti-reflection coating of a quasi-optical hot-electron-bolometric mixer at terahertz frequencies |
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Journal Article |
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Year |
2001 |
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Infrared Physics & Technology |
Abbreviated Journal |
Infrared Physics & Technology |
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Volume |
42 |
Issue |
1 |
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41-47 |
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NbN HEB mixers, anti-reflection coating |
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Parylene C was investigated as anti-reflection coating for silicon at terahertz frequencies. Measurements with a Fourier-transform spectrometer show that the transmittance of pure silicon can be improved by about 30% when applying a layer of Parylene C with a quarter wavelength optical thickness. The 10% bandwidth of this coating extends from 1.5 to 3 THz for a center frequency of 2.3–2.5 THz, where the transmittance is constant. Heterodyne measurements demonstrate that the noise temperature of a hot-electron-bolometric mixer can be reduced significantly by coating the silicon lens of the hybrid antenna with a quarter wavelength Parylene C layer. Compared to the same mixer with an uncoated lens the improvement is about 30% at a frequency of 2.5 THz. |
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1350-4495 |
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1548 |
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Author |
Chen, P. S. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Infrared properties of barium stars |
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Journal Article |
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2001 |
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Astron. Astrophys. |
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A&A |
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372 |
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1 |
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245-248 |
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0004-6361 |
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RPLAB @ s @ |
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415 |
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Zwiller, Vale<cc><81>ry; Blom, Hans; Jonsson, Per; Panev, Nikolay; Jeppesen, Sören; Tsegaye, Tedros; Goobar, Edgard; Pistol, Mats-Erik; Samuelson, Lars; Björk, Gunnar |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Single quantum dots emit single photons at a time: Antibunching experiments |
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Journal Article |
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Year |
2001 |
Publication |
Applied Physics Letters |
Abbreviated Journal |
Appl. Phys. Lett. |
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Volume |
78 |
Issue |
17 |
Pages |
2476 |
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Keywords |
antibunching, quantum dot |
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0003-6951 |
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502 |
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Gol’tsman, G. N.; Okunev, O.; Chulkova, G.; Lipatov, A.; Semenov, A.; Smirnov, K.; Voronov, B.; Dzardanov, A.; Williams, C.; Sobolewski, R. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Picosecond superconducting single-photon optical detector |
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Journal Article |
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Year |
2001 |
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Appl. Phys. Lett. |
Abbreviated Journal |
Appl. Phys. Lett. |
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79 |
Issue |
6 |
Pages |
705-707 |
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NbN SSPD, SNSPD |
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We experimentally demonstrate a supercurrent-assisted, hotspot-formation mechanism for ultrafast detection and counting of visible and infrared photons. A photon-induced hotspot leads to a temporary formation of a resistive barrier across the superconducting sensor strip and results in an easily measurable voltage pulse. Subsequent hotspot healing in ∼30 ps time frame, restores the superconductivity (zero-voltage state), and the detector is ready to register another photon. Our device consists of an ultrathin, very narrow NbN strip, maintained at 4.2 K and current-biased close to the critical current. It exhibits an experimentally measured quantum efficiency of ∼20% for 0.81 μm wavelength photons and negligible dark counts. |
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0003-6951 |
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no |
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1543 |
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Author |
Ganzevles, W. F. M.; Gao, J. R.; de Korte, P. A. J.; Klapwijk, T. M. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Direct response of microstrip line coupled Nb THz hot-electron bolometer mixers |
Type |
Journal Article |
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Year |
2001 |
Publication |
Applied Physics Letters |
Abbreviated Journal |
Appl. Phys. Lett. |
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Volume |
79 |
Issue |
15 |
Pages |
2483-2485 |
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0003-6951 |
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311 |
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Gol’tsman, G.; Okunev, O.; Chulkova, G.; Lipatov, A.; Dzardanov, A.; Smirnov, K.; Semenov, A.; Voronov, B.; Williams, C.; Sobolewski, R. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Fabrication and properties of an ultrafast NbN hot-electron single-photon detector |
Type |
Journal Article |
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Year |
2001 |
Publication |
IEEE Trans. Appl. Supercond. |
Abbreviated Journal |
IEEE Trans. Appl. Supercond. |
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Volume |
11 |
Issue |
1 |
Pages |
574-577 |
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Keywords |
NbN SSPD, SNSPD |
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A new type of ultra-high-speed single-photon counter for visible and near-infrared wavebands based on an ultrathin NbN hot-electron photodetector (HEP) has been developed. The detector consists of a very narrow superconducting stripe, biased close to its critical current. An incoming photon absorbed by the stripe produces a resistive hotspot and causes an increase in the film’s supercurrent density above the critical value, leading to temporary formation of a resistive barrier across the device and an easily measurable voltage pulse. Our NbN HEP is an ultrafast (estimated response time is 30 ps; registered time, due to apparatus limitations, is 150 ps), frequency unselective device with very large intrinsic gain and negligible dark counts. We have observed sequences of output pulses, interpreted as single-photon events for very weak laser beams with wavelengths ranging from 0.5 /spl mu/m to 2.1 /spl mu/m and the signal-to-noise ratio of about 30 dB. |
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1558-2515 |
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1547 |
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Skalare, A.; McGrath, William R.; Echternach, P. M.; Leduc, H. G.; Siddiqi, I.; Verevkin, A.; Prober, D. E. |
![find record details (via OpenURL) openurl](img/xref.gif)
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Title |
Aluminum hot-electron bolometer mixers at submillimeter wavelengths |
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Journal Article |
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Year |
2001 |
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IEEE Trans. Appl. Supercond. |
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Volume |
11 |
Issue |
1 |
Pages |
641-644 |
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Al HEB mixer, contacts, interface, in situ, in-situ, Aluminium HEB mixer |
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Abstract |
Diffusion-cooled aluminum hot-electron bolometer (HEB) mixers are of interest for low-noise high resolution THz-frequency spectroscopy within astrophysics. Al HEB mixers offer operation with an order of magnitude less local oscillator power, higher intermediate frequency bandwidth and potentially lower noise than competing devices made from other materials. We report on mixer experiments at 618 GHz with devices fabricated from films with sheet resistances in the range from about 55 Ω down to about 9 Ω per square. Intermediate frequency bandwidths of up to 3 GHz were measured (1 μm long device), with absorbed local oscillator power levels of 0.5 to 6 nW and mixer conversion up to -21.5 dB. High input coupling efficiency implies that the electrons in the device are able to thermalize before escaping from the device. It was found that the long coherence length complicates mixer operations due to the proximity of the contact pads. Also, saturation at the IF frequency may be a concern for this type of device, and warrants further studies. |
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1051-8223 |
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ref919426b |
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Kawamura, J.; Tong, C.-Y. E.; Blundell, R.; Papa, D. C.; Hunter, T. R.; Patt, F.; Gol’tsman, G.; Gershenzon, E. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Terahertz-frequency waveguide NbN hot-electron bolometer mixer |
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Journal Article |
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Year |
2001 |
Publication |
IEEE Trans. Appl. Supercond. |
Abbreviated Journal |
IEEE Trans. Appl. Supercond. |
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Volume |
11 |
Issue |
1 |
Pages |
952-954 |
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Keywords |
NbN HEB mixers |
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We have developed a low-noise waveguide heterodyne receiver for operation near 1 THz using phonon-cooled NbN hot-electron bolometers. The mixer elements are submicron-sized microbridges of 4 nm-thick NbN film fabricated on a quartz substrate. Operating at a bath temperature of 4.2 K, the double-sideband receiver noise temperature is 760 K at 1.02 THz and 1100 K at 1.26 THz. The local oscillator is provided by solid-state sources, and power measured at the source is less than 1 /spl mu/W. The intermediate frequency bandwidth exceeds 2 GHz. The receiver was used to make the first ground-based heterodyne detection of a celestial spectroscopic line above 1 THz. |
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Kroug, M.; Cherednichenko, S.; Merkel, H.; Kollberg, E.; Voronov, B.; Gol'tsman, G.; Hübers, H. W.; Richter, H. |
![find record details (via OpenURL) openurl](img/xref.gif)
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Title |
NbN hot electron bolometric mixers for terahertz receivers |
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Journal Article |
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2001 |
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IEEE Trans. Appl. Supercond. |
Abbreviated Journal |
IEEE Trans. Appl. Supercond. |
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Volume |
11 |
Issue |
1 |
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962-965 |
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NbN HEB mixers |
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Sensitivity and gain bandwidth measurements of phonon-cooled NbN superconducting hot-electron bolometer mixers are presented. The best receiver noise temperatures are: 700 K at 1.6 THz and 1100 K at 2.5 THz. Parylene as an antireflection coating on silicon has been investigated and used in the optics of the receiver. The dependence of the mixer gain bandwidth (GBW) on the bias voltage has been measured. Starting from low bias voltages, close to operating conditions yielding the lowest noise temperature, the GBW increases towards higher bias voltages, up to three times the initial value. The highest measured GBW is 9 GHz within the same bias range the noise temperature increases by a factor of two. |
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