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Author | Karasik, Boris S.; Cantor, Robin | ||||
Title | Optical NEP in hot-electron nanobolometers | Type | Journal Article | ||
Year | 2010 | Publication | Abbreviated Journal | ||
Volume | Issue | Pages | 1-7 | ||
Keywords | HEB, Ti, NEP, femtowatt, SAFARI, SPICA, 650 GHz, 0.65 THz, 460 um, twin slot antenna, SQUID readout | ||||
Abstract | For the first time, we have measured the optical noise equivalent power (NEP) in titanium (Ti) superconducting hot-electron nanobolometers (nano-HEBs). The bolometers were 2{\mu}mx1{\mu}mx20nm and 1{\mu}mx1{\mu}mx20nm planar antenna-coupled devices. The measurements were done at {\lambda} = 460 {\mu}m using a cryogenic black body radiation source delivering optical power from a fraction of a femtowatt to a few 100s of femtowatts. A record low NEP = 3x10^{-19} W/Hz^{1/2} at 50 mK has been achieved. This sensitivity meets the requirements for SAFARI instrument on the SPICA telescope. The ways for further improvement of the nano-HEB detector sensitivity are discussed. | ||||
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Notes | To appear in Proc. 21st Int. Symp. on Spc. THz Technol., Oxford, UK, 23-25 March, 2010 | Approved | no | ||
Call Number | Serial | 623 | |||
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Author | Huebers, Heinz-Wilhelm; Pavlov, S.; Semenov, A.; Köhler, R.; Mahler, L.; Tredicucci, A.; Beere, H.; Ritchie, D.; Linfield, E. | ||||
Title | Terahertz quantum cascade laser as local oscillator in a heterodyne receiver | Type | Journal Article | ||
Year | 2005 | Publication | Optics Express | Abbreviated Journal | |
Volume | 13 | Issue | 15 | Pages | 5890-5896 |
Keywords | QCL heterodyne, 6 mW at 2.5 THz, HEB mixer, terahertz | ||||
Abstract | Terahertz quantum cascade lasers have been investigated with respect to their performance as a local oscillator in a heterodyne receiver. The beam profile has been measured and transformed in to a close to Gaussian profile resulting in a good matching between the field patterns of the quantum cascade laser and the antenna of a superconducting hot electron bolometric mixer. Noise temperature measurements with the hot electron bolometer and a 2.5 THz quantum cascade laser yielded the same result as with a gas laser as local oscillator. | ||||
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Notes | Approved | no | |||
Call Number | Serial | 627 | |||
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Author | Rabanus, D.; Graf, U. U.; Philipp, M.; Ricken, O.; Stutzki, J.; Vowinkel, B.; Wiedner, M. C.; Walther, C.; Fischer, M.; Faist, J. | ||||
Title | Phase locking of a 1.5 terahertz quantum cascade laser and use as a local oscillator in a heterodyne HEB receiver | Type | Journal Article | ||
Year | 2009 | Publication | Optics Express | Abbreviated Journal | |
Volume | 17 | Issue | 3 | Pages | 1159-1168 |
Keywords | QCL heterodyne, 300 uW at 1.5 THz, HEB mixer | ||||
Abstract | We demonstrate for the first time the closure of an electronic phase lock loop for a continuous–wave quantum cascade laser (QCL) at 1.5 THz. The QCL is operated in a closed cycle cryo cooler. We achieved a frequency stability of better than 100 Hz, limited by the resolution bandwidth of the spectrum analyser. The PLL electronics make use of the intermediate frequency (IF) obtained from a hot electron bolometer (HEB) which is downconverted to a PLL IF of 125 MHz. The coarse selection of the longitudinal mode and the fine tuning is achieved via the bias voltage of the QCL. Within a QCL cavity mode, the free-running QCL shows frequency fluctuations of about 5 MHz, which the PLL circuit is able to control via the Stark–shift of the QCL gain material. Temperature dependent tuning is shown to be nonlinear, and of the order of -16 MHz/K. Additionally we have used the QCL as local oscillator (LO) to pump an HEB and perform, again for the first time at 1.5 THz, a heterodyne experiment, and obtain a receiver noise temperature of 1741 K. | ||||
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Notes | Approved | no | |||
Call Number | Serial | 628 | |||
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Author | de Lange, Gert; Krieg, Jean-Michel; Honingh, Netty; Karpov, Alexandre; Cherednichenko, Sergey | ||||
Title | Performance of the HIFI flight mixers | Type | Conference Article | ||
Year | 2008 | Publication | Proc. 19th Int. Symp. Space Terahertz Technol. | Abbreviated Journal | |
Volume | Issue | Pages | 98-105 | ||
Keywords | HEB mixer applications, HEB applications | ||||
Abstract | We summarize the technology and final results of the superconducting heterodyne SIS and HEB mixers that are developed for the HIFI instrument. Within HIFI 7 frequency bands cover the frequency range from 480 GHz to 1910 GHz. We describe the different device technologies and optical coupling schemes that are used to cover the frequency bands. The efforts of the different mixer teams that participate in HIFI have contributed to an instrument that will have unprecedented sensitivity and frequency coverage. | ||||
Address | Groningen | ||||
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Notes | Approved | no | |||
Call Number | Serial | 1074 | |||
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Author | Tretyakov, Ivan; Ryabchun, Sergey; Finkel, Matvey; Maslennikov, Sergey; Maslennikova, Anna; Kaurova, Natalia; Lobastova, Anastasia; Voronov, Boris; Gol'tsman, Gregory | ||||
Title | Ultrawide noise bandwidth of NbN hot-electron bolometer mixers with in situ gold contacts | Type | Journal Article | ||
Year | 2011 | Publication | IEEE Trans. Appl. Supercond. | Abbreviated Journal | |
Volume | 21 | Issue | 3 | Pages | 620-623 |
Keywords | NbN HEB mixer bandwidth | ||||
Abstract | We report a noise bandwidth of 7 GHz in the new generation of NbN hot-electron bolometer (HEB) mixers that are being developed for the space observatory Millimetron. The HEB receiver driven by a 2.5-THz local oscillator offered a noise temperature of 600 K in a 50-MHz final detection bandwidth. As the filter center frequency was swept this value remained nearly constant up to the cutoff frequency of the cryogenic amplifier at 7 GHz. We believe that such a low value of the noise temperature is due to reduced radio frequency (RF) loss at the interface between the superconducting film and the gold contacts. We have also performed gain bandwidth measurements at the superconducting transition on HEB mixers with various lengths and found them to be in excellent agreement with the results of the analytical and numerical models developed for the HEB mixer with both diffusion and phonon cooling of hot electrons. | ||||
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Notes | Approved | no | |||
Call Number | RPLAB @ gujma @ | Serial | 716 | ||
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Author | Lobanov, Y.; Tong, E.; Blundell, R.; Hedden, A.; Voronov, B.; Gol'tsman, G. | ||||
Title | Large-signal frequency response of an HEB mixer: from 300 MHz to terahertz | Type | Journal Article | ||
Year | 2011 | Publication | IEEE Trans. Appl. Supercond. | Abbreviated Journal | |
Volume | 21 | Issue | 3 | Pages | 628-631 |
Keywords | waveguide NbN HEB mixers | ||||
Abstract | We present a study of the large signal frequency response of an HEB mixer over a wide frequency range. In our experiments, we have subjected the HEB mixer to incident electromagnetic radiation from 0.3 GHz to 1 THz. The mixer element is an NbN film deposited on crystalline quartz. The mixer chip is mounted in a waveguide cavity, coupled to free space with a diagonal horn. At microwave frequencies, electromagnetic radiation is applied through the coaxial bias port of the mixer block. At higher frequencies the input signal passes via the diagonal horn feed. At each frequency, the incident power is varied and a family of I-V curves is recorded. From the curves we identify 3 distinct regimes of operation of the mixer separated by the phonon relaxation frequency and the superconducting energy gap frequency observed at about 3 GHz and 660 GHz respectively. In this paper, we will present observed curves and discuss the results of our experiment. | ||||
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Notes | Approved | no | |||
Call Number | RPLAB @ gujma @ | Serial | 719 | ||
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Author | Ожегов, Роман Викторович | ||||
Title | Флуктуационная чувствительность и стабильность приемников с СИС и HEB смесителями для терагерцового тепловидения | Type | Journal Article | ||
Year | 2011 | Publication | Радиофизика | Abbreviated Journal | |
Volume | Issue | Pages | 135 | ||
Keywords | HEB | ||||
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Notes | Approved | no | |||
Call Number | RPLAB @ gujma @ | Serial | 731 | ||
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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 | |
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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Notes | Approved | no | |||
Call Number | Serial | 761 | |||
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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 | |
Volume | Issue | 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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Notes | Approved | no | |||
Call Number | Serial | 857 | |||
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Author | Khosropanah, P.; Merkel, H.; Yngvesson, S.; Adam, A.; Cherednichenko, S.; Kollberg, E. | ||||
Title | A distributed device model for phonon-cooled HEB mixers predicting IV characteristics, gain, noise and IF bandwidth | Type | Conference Article | ||
Year | 2000 | Publication | Proc. 11th Int. Symp. Space Terahertz Technol. | Abbreviated Journal | |
Volume | Issue | Pages | 474-488 | ||
Keywords | HEB mixer numerical model, diffusion cooling channel, diffusion channel, distributed HEB model, distributed model | ||||
Abstract | A distributed model for phonon-cooled superconductor hot electron bolometer (HEB) mixers is given, which is based on solving the one-dimensional heat balance equation for the electron temperature profile along the superconductor strip. In this model it is assumed that the LO power is absorbed uniformly along the bridge but the DC power absorption depends on the local resistivity and is thus not uniform. The electron temperature dependence of the resistivity is assumed to be continuous and has a Fermi form. These assumptions are used in setting up the non-linear heat balance equation, which is solved numerically for the electron temperature profile along the bolometer strip. Based on this profile the resistance of the device and the IV curves are calculated. The IV curves are in excellent agreement with measurement results. Using a small signal model the conversion gain of the mixer is obtained. The expressions for Johnson noise and thermal fluctuation noise are derived. The calculated results are in close agreement with measurements, provided that one of the parameters used is adjusted. | ||||
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Publisher | Place of Publication | University of Michigan, Ann Arbor, MI USA | Editor | ||
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Notes | Approved | no | |||
Call Number | Serial | 893 | |||
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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. | Abbreviated Journal | |
Volume | Issue | Pages | 566-582 | ||
Keywords | HEB mixer model, standard model, electro-thermal feedback, self-heating parameter, heating efficiency | ||||
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Notes | Approved | no | |||
Call Number | Serial | 895 | |||
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Author | Lobanov, Yury; Shcherbatenko, Michael; Shurakov, Alexander; Rodin, Alexander V.; Klimchuk, Artem; Nadezhdinsky, Alexander I.; Maslennikov, Sergey; Larionov, Pavel; Finkel, Matvey; Semenov, Alexander; Verevkin, Aleksandr A.; Voronov, Boris M.; Ponurovsky, Yakov; Klapwijk, Teunis M.; Gol'tsman, Gregory N. | ||||
Title | Heterodyne detection at near-infrared wavelengths with a superconducting NbN hot-electron bolometer mixer | Type | Journal Article | ||
Year | 2014 | Publication | Opt. Lett. | Abbreviated Journal | |
Volume | 39 | Issue | 6 | Pages | 1429-1432 |
Keywords | HEB, zebra, IR, infrared | ||||
Abstract | We report on the development of a highly sensitive optical receiver for heterodyne IR spectroscopy at the communication wavelength of 1.5 μm (200 THz) by use of a superconducting hot-electron bolometer. The results are important for the resolution of narrow spectral molecular lines in the near-IR range for the study of astronomical objects, as well as for quantum optical tomography and fiber-optic sensing. Receiver configuration as well as fiber-to-detector light coupling designs are discussed. Light absorption of the superconducting detectors was enhanced by nano-optical antennas, which were coupled to optical fibers. An intermediate frequency (IF) bandwidth of about 3 GHz was found in agreement with measurements at 300 GHz, and a noise figure of about 25 dB was obtained that was only 10 dB above the quantum limit. | ||||
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Notes | Approved | no | |||
Call Number | Serial | 906 | |||
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Author | Khosropanah, Pourya | ||||
Title | NbN and NbTiN hot electron bolometer THz mixers | Type | Book Whole | ||
Year | 2003 | Publication | Chalmers University of Technology | Abbreviated Journal | |
Volume | Issue | Pages | |||
Keywords | HEB mixer, hot electron bolometer mixer, NbN, NbTiN, superconducting detector, heterodyne receiver, THz mixer, submillimeter mixer, quasioptical receiver, double slot antenna, twin slot antenna, spiral antenna, receiver noise, FTS, Fourier Transform Spectrometer | ||||
Abstract | The thesis reports the development of Hot Electron Bolometer (HEB) mixers for radio astronomy heterodyne receivers in THz frequency range. Part of this work is the fabrication of HEB devices, which are based on NbN or NbTiN superconducting thin films (â‰<a4>5 nm). They are integrated with wideband spiral or double-slot planar antennas. The mixer chips are incorporated into a quasi-optical receiver. The experimental part of this work focuses on the characterization of the receiver as a whole, and the HEB mixers as a part. Double side band receiver noise temperature and the IF bandwidth are reported for frequencies from 0.7 THz up to 2.6 THz. The spectrum of the direct response of HEB integrated with dierent antennas are measured using Fourier Transform Spectrometer (FTS). The effect of the bolometer size on total receiver performance and the LO power requirements is also discussed. A high-yield and reliable process for fabrication of NbN HEB mixers have been achieved. Over 100 devices with different bolometer geometry, film property and also different antennas have been fabricated and measured. The measured data enables us to discuss the impact of different parameters to the receiver overall performance. This work has provided NbN HEB mixers to the following receivers: TREND (Terahertz REceiver with NbN HEB Device) operating at 1.25-1.5 THz, installed in AST/RO Submillimeter Wave Telescope, Amundsen/Scott South Pole Station, in 2002-2003. Band 6-low (1.410-1.700 THz) and 6-high (1.700-1.920 THz) of the HIFI (Heterodyne Instrument for Far Infra-red) in the Herschel Space Observatory, due to launch in 2007 by ESA (European Space Agency). Besides, there has been continuous efforts to develop better models to explain the mixer performance more accurately. They are based on two temperature model for electrons and phonons and solving one-dimensional heat balance equations along the bolometer. The principles of these models are illustrated and the calculated results are compared with measured data. |
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Corporate Author | Thesis | Ph.D. thesis | |||
Publisher | Chalmers University of Technology | Place of Publication | Göteborg | Editor | |
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Notes | Approved | no | |||
Call Number | Serial | 910 | |||
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Author | Gurevich, A. Vl.; Mints, R. G. | ||||
Title | Self-heating in normal metals and superconductors | Type | Journal Article | ||
Year | 1987 | Publication | Rev. Mod. Phys. | Abbreviated Journal | |
Volume | 59 | Issue | 4 | Pages | 941-1000 |
Keywords | HEB, Joule self-heating effect | ||||
Abstract | This review is devoted to the physics of current-carrying superconductors and normal metals having two or more stable states sustained by Joule self-heating. The creation, propagation, and localization of electrothermal domains and switching waves leading to the transition from one stable state to another in uniform and nonuniform samples are treated in detail. The connection between thermal bistability and hysteresis, dropping and stepped current-voltage characteristics, self-induced oscillations of current and voltage, selfreplication of electrothermal domains, and the formation of periodic and stochastic resistive structures are considered. | ||||
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Notes | Approved | no | |||
Call Number | Serial | 917 | |||
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Author | Pekker, David; Shah, Nayana; Sahu, Mitrabhanu; Bezryadin, Alexey; Goldbart, Paul M. | ||||
Title | Stochastic dynamics of phase-slip trains and superconductive-resistive switching in current-biased nanowires | Type | Journal Article | ||
Year | 2009 | Publication | Phys. Rev. B | Abbreviated Journal | |
Volume | 80 | Issue | Pages | 214525 (1 to 17) | |
Keywords | superconducting nanowire, phase-slip, order parameter, HEB distributed model, HEB model | ||||
Abstract | Superconducting nanowires fabricated via carbon-nanotube templating can be used to realize and study quasi-one-dimensional superconductors. However, measurement of the linear resistance of these nanowires have been inconclusive in determining the low-temperature behavior of phase-slip fluctuations, both quantal and thermal. Thus, we are motivated to study the nonlinear current-voltage characteristics in current-biased nanowires and the stochastic dynamics of superconductive-resistive switching, as a way of probing phase-slip events. In particular, we address the question: can a single phase-slip event occurring somewhere along the wire—during which the order-parameter fluctuates to zero—induce switching, via the local heating it causes? We explore this and related issues by constructing a stochastic model for the time evolution of the temperature in a nanowire whose ends are maintained at a fixed temperature. We derive the corresponding master equation as a tool for evaluating and analyzing the mean switching time at a given value of current (smaller than the depairing critical current). The model indicates that although, in general, several phase-slip events are necessary to induce switching via a thermal runaway, there is indeed a regime of temperatures and currents in which a single event is sufficient. We carry out a detailed comparison of the results of the model with experimental measurements of the distribution of switching currents, and provide an explanation for the rather counterintuitive broadening of the distribution width that is observed upon lowering the temperature. Moreover, we identify a regime in which the experiments are probing individual phase-slip events, and thus offer a way of unearthing and exploring the physics of nanoscale quantum tunneling of the one-dimensional collective quantum field associated with the superconducting order parameter. | ||||
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Notes | Recommended by Klapwijk | Approved | no | ||
Call Number | Serial | 923 | |||
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