| Records |
| Author |
Jian Wei; David Olaya; Boris Karasik; Sergey Pereverzev; Andrei Sergeev; Michael Gershenson |
| Title |
Ultra-sensitive hot-electron nanobolometers for terahertz astrophysics |
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Journal Article |
| Year |
2007 |
Publication |
ArXiv e-prints |
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| Volume |
710 |
Issue |
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Pages |
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| Keywords |
cond-mat.other; astro-ph; cond-mat.mes-hall |
| Abstract |
The background-limited spectral imaging of the early Universe requires spaceborne terahertz (THz) detectors with the sensitivity 2-3 orders of magnitude better than that of the state-of-the-art bolometers. To realize this sensitivity without sacrificing operating speed, novel detector designs should combine an ultrasmall heat capacity of a sensor with its unique thermal isolation. Quantum effects in thermal transport at nanoscale put strong limitations on the further improvement of traditional membrane-supported bolometers. Here we demonstrate an innovative approach by developing superconducting hot-electron nanobolometers in which the electrons are cooled only due to a weak electron-phonon interaction. At T<0.1K, the electron-phonon thermal conductance in these nanodevices becomes less than one percent of the quantum of thermal conductance. The hot-electron nanobolometers, sufficiently sensitive for registering single THz photons, are very promising for submillimeter astronomy and other applications based on quantum calorimetry and photon counting. |
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arXiv:0710.5474v1; 19 pages, 3 color figures |
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RPLAB @ s @ |
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407 |
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| Author |
Khosropanah, P.; Gao, J. R.; Laauwen, W. M.; Hajenius, M; Klapwijk, T. M. |
| Title |
Low noise NbN hot electron bolometer mixer at 4.3 THz |
Type |
Journal Article |
| Year |
2007 |
Publication |
Appl. Phys. Lett. |
Abbreviated Journal |
Appl. Phys. Lett. |
| Volume |
91 |
Issue |
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Pages |
221111 (1 to 3) |
| Keywords |
NbN HEB mixers, NbN, contacts cleaning |
| Abstract |
We have studied the sensitivity of a superconducting NbN hot electron bolometer mixer integrated with a spiral antenna at 4.3 THz. Using hot/cold blackbody loads and a beam splitter all in vacuum, we measured a double sideband receiver noise temperature of 1300 K at the optimum local oscillator (LO) power of 330 nW, which is about 12 times the quantum noise (hnu/2kB). Our result indicates that there is no sign of degradation of the mixing process at the superterahertz frequencies. Moreover, a measurement method is introduced which allows us for an accurate determination of the sensitivity despite LO power fluctuations. |
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no |
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584 |
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| Author |
Масленников, Сергей Николаевич |
| Title |
Смесители на эффекте электронного разогрева для терагерцового и инфракрасного диапазонов |
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Manuscript |
| Year |
2007 |
Publication |
М. МПГУ |
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HEB, detector, mixer, terahertz, THz, infrared, IR, direct detection effect, conversion loss |
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Ph.D. thesis |
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Russian |
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no |
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481 |
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| Author |
Cao, Aiqin; Jiang, L.; Chen, S.H.; Antipov, S.V.; Shi, S.C. |
| Title |
IF gain bandwidth of a quasi-optical NbN superconducting HEB mixer |
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Conference Article |
| Year |
2007 |
Publication |
Proc. International conference on microwave and millimeter wave technology |
Abbreviated Journal |
Proc. ICMMT |
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1-3 |
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HEB, mixer, gain bandwidth |
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In this paper, the intermediate frequency (IF) gain bandwidth of a quasi-optical NbN superconducting hot-electron bolometer (HEB) mixer is investigated at 500 GHz with an IF system incorporating with a frequency down-converting scheme which is able to sweep the IF signal in a frequency range of 0.3-4 GHz. The IF gain bandwidth of the device is measured to be 1.5 GHz when it is biased at a voltage of the minimum noise temperature, and becomes larger when the bias voltage increases. |
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Builin |
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no |
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RPLAB @ lobanovyury @ |
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575 |
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| Author |
Koch, Martin |
| Title |
Terahertz communications: a 2020 vision |
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Book Chapter |
| Year |
2007 |
Publication |
NATO Security through Science Series |
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2007 |
Issue |
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Pages |
325-338 |
| Keywords |
terahertz THz communications |
| Abstract |
We discuss basic considerations for potential short-range THz communication systems which may replace or supplement present WLAN systems in 10–15 years from now. On the basis of a few fundamental estimations we show that such a system will need a line-of-sight connection between receiver and emitter. To circumvent the blocking of the direct line-of-sight connection indoor THz communication systems will also have to rely on non-line-of-sight paths which involve reflections off the walls. The reflectivity of the walls can be enhanced by dielectric mirrors. This new scheme makes steerable high-gain antennas a necessity. Hence, a wireless THz communication system can not be a simple extension of the existing technology of today's local area networks. Instead it involves completely new concepts and ideas that have not yet been worked upon. |
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no |
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594 |
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| Author |
Takesue, Hiroki; Nam, Sae Woo; Zhang, Qiang; Hadfield, Robert H.; Honjo, Toshimori; Tamaki, Kiyoshi; Yamamoto, Yoshihisa |
| Title |
Quantum key distribution over a 40-dB channel loss using superconducting single-photon detectors |
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Journal Article |
| Year |
2007 |
Publication |
Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
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1 |
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Pages |
343-348 |
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quantum cryptography, SSPD, QKD, DSP |
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no |
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RPLAB @ akorneev @ |
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609 |
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Yang, J. K. W.; Kerman, A. J.; Dauler, E. A.; Anant, V.; Rosfjord, K. M.; Berggren, K. K. |
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Modeling the electrical and thermal response of superconducting nanowire single-photon detectors |
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Journal Article |
| Year |
2007 |
Publication |
IEEE Trans. Appl. Supercond. |
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| Volume |
17 |
Issue |
2 |
Pages |
581 - 585 |
| Keywords |
SSPD, modeling |
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We modeled the response of superconducting nanowire single-photon detectors during a photodetection event, taking into consideration only the thermal and electrical properties of a superconducting NbN nanowire on a sapphire substrate. Our calculations suggest that heating which occurs after the formation of a photo-induced resistive barrier is responsible for the generation of a measurable voltage pulse. We compared this numerical result with experimental data of a voltage pulse from a slow device, i.e. large kinetic inductance, and obtained a good fit. Using this electro-thermal model, we estimated the temperature rise and the resistance buildup in the nanowire, and the return current at which the nanowire becomes superconducting again. We also show that the reset time of these photodetectors can be decreased by the addition of a series resistance and provide supporting experimental data. Finally we present preliminary results on a detector latching behavior that can also be explained using the electro-thermal model. |
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no |
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625 |
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| Author |
Морозов, Дмитрий Владимирович |
| Title |
Приемные устройства терагерцового диапазона на эффекте разогрева двумерного электронного газа в гетероструктурах AlGaAs/GaAs |
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Manuscript |
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2007 |
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М. МПГУ |
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Ph.D. thesis |
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no |
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RPLAB @ s @ |
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626 |
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| Author |
Williams, Benjamin S. |
| Title |
Terahertz quantum-cascade lasers |
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Journal Article |
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2007 |
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Nature Photonics |
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1 |
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517-525 |
| Keywords |
QCL review |
| Abstract |
Six years after their birth, terahertz quantum-cascade lasers can now deliver milliwatts or more of continuous-wave coherent radiation throughout the terahertz range — the spectral regime between millimetre and infrared wavelengths, which has long resisted development. This paper reviews the state-of-the-art and future prospects for these lasers, including efforts to increase their operating temperatures, deliver higher output powers and emit longer wavelengths. |
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no |
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632 |
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| Author |
Novotny, Lukas |
| Title |
Effective wavelength scaling for optical antennas |
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Journal Article |
| Year |
2007 |
Publication |
Phys. Rev. Lett. |
Abbreviated Journal |
Phys. Rev. Lett. |
| Volume |
98 |
Issue |
26 |
Pages |
266802(1-4) |
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optical antennas |
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In antenna theory, antenna parameters are directly related to the wavelength λ of incident radiation, but this scaling fails at optical frequencies where metals behave as strongly coupled plasmas. In this Letter we show that antenna designs can be transferred to the optical frequency regime by replacing λ by a linearly scaled effective wavelength λeff=n1+n2λ/λp, with λp being the plasma wavelength and n1, n2 being coefficients that depend on geometry and material properties. It is assumed that the antenna is made of linear segments with radii Râ‰<aa>λ. Optical antennas hold great promise for increasing the efficiency of photovoltaics, light-emitting devices, and optical sensors. |
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RPLAB @ gujma @ |
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749 |
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