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Author | Kozorezov, A. G.; Lambert, C.; Marsili, F.; Stevens, M. J.; Verma, V. B.; Stern, J. A.; Horansky, R.; Dyer, S.; Duff, S.; Pappas, D. P.; Lita, A.; Shaw, M. D.; Mirin, R. P.; Sae Woo Nam | ||||
Title | Quasiparticle recombination in hotspots in superconducting current-carrying nanowires | Type | Journal Article | ||
Year | 2015 | Publication | Abbreviated Journal | Phys. Rev. B | |
Volume | 92 | Issue | 6 | Pages | |
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Abstract | We describe a kinetic model of recombination of non-equilibrium quasiparticles generated by single photon absorption in superconducting current-carrying nanowires. The model is developed to interpret two-photon detection experiments in which a single photon does not possess sufficient energy for breaking superconductivity at a fixed low bias current. We show that quasiparticle self- recombination in relaxing hotspot dominates diffusion expansion effects and explains the observed strong bias current, wavelength and temperature dependencies of hotspot relaxation in tungsten silicide superconducting nanowire single-photon detectors. | ||||
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Language | English | Summary Language | Original Title | ||
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Call Number | RPLAB @ alex_kazakov @ | Serial | 1003 | ||
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Author | Takesue, Hiroki; Dyer, Shellee D.; Stevens, Martin J.; Verma, Varun; Mirin, Richard P.; Nam, Sae Woo | ||||
Title | Quantum teleportation over 100 km of fiber using highly efficient superconducting nanowire single-photon detectors | Type | Journal Article | ||
Year | 2015 | Publication | Abbreviated Journal | Optica | |
Volume | 2 | Issue | Pages | ||
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Abstract | Quantum teleportation is an essential quantum operation by which we can transfer an unknown quantum state to a remote location with the help of quantum entanglement and classical communication. Since the first experimental demonstrations using photonic qubits and continuous variables, the distance of photonic quantum teleportation over free-space channels has continued to increase and has reached >100 km. On the other hand, quantum teleportation over optical fiber has been challenging, mainly because the multifold photon detection that inevitably accompanies quantum teleportation experi- ments has been very inefficient due to the relatively low de- tection efficiencies of typical telecom-band single-photon detectors. Here, we report on quantum teleportation over optical fiber using four high-detection-efficiency supercon- ducting nanowire single-photon detectors (SNSPDs). These SNSPDs make it possible to perform highly efficient multi- fold photon measurements, allowing us to confirm that the quantum states of input photons were successfully tele- ported over 100 km of fiber with an average fidelity of 83.7 2.0%. | ||||
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Call Number | RPLAB @ alex_kazakov @ | Serial | 1004 | ||
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Author | Smirnov, Konstantin; Vachtomin, Yury; Divochiy, Alexander; Antipov, Andrey; Goltsman, Gregory | ||||
Title | Dependence of dark count rates in superconducting single photon detectors on the filtering effect of standard single mode optical fibers | Type | Journal Article | ||
Year | 2015 | Publication | Appl. Phys. Express | Abbreviated Journal | Appl. Phys. Express |
Volume | 8 | Issue | 2 | Pages | 022501 (1 to 4) |
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Publisher | IOP Publishing | Place of Publication | Editor | ||
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ISSN | 1882-0778 | ISBN | Medium | ||
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Notes | Approved | no | |||
Call Number | RPLAB @ sasha @ smirnov2015dependence | Serial | 1049 | ||
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Author | Sidorova, Maria V.; Divochiy, Alexander; Vakhtomin, Yury B.; Smirnov, Konstantin V. | ||||
Title | Ultrafast superconducting single-photon detector with reduced-size active area coupled to a tapered lensed single-mode fiber | Type | Conference Article | ||
Year | 2015 | Publication | Proc. SPIE | Abbreviated Journal | |
Volume | 9504 | Issue | Pages | 950408 (1 to 9) | |
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Publisher | Place of Publication | Editor | International Society for Optics and Photonics | ||
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Call Number | RPLAB @ sasha @ sidorova2015ultrafast | Serial | 1051 | ||
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Author | Mehdi, I.; Gol'tsman, G.; Putz, P. | ||||
Title | Introduction to the mini-special-issue on the 25th international symposium on space terahertz technology (ISSTT) | Type | Miscellaneous | ||
Year | 2015 | Publication | IEEE Trans. THz Sci. Technol. | Abbreviated Journal | IEEE Trans. THz Sci. Technol. |
Volume | 5 | Issue | 1 | Pages | 14-15 |
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Abstract | THE 25th International Symposium on Space Terahertz Technology (ISSTT) was held in Moscow, Russia, between April 27–30, 2014. The conference was organized by Moscow State Pedagogical University and the Higher School of Economics (National Research University) and Chaired by Professor Gregory Gol'tsman of Moscow State Pedagogical University. The conference was attended by roughly 150 participants from 15 countries. The technology covered by ISSTT includes detectors, devices, circuits and systems in various areas of THz science and technology. Each year this symposium brings together the global THz space science technology community, and as such, emphasizes the broad international collaboration that is required to execute these large complicated instrument programs that dominate this field. However, talks covering technologies for balloon, aircraft, and ground-based telescopes were also presented. In this special section of IEEE Transactions on Terahertz Science and Technology, we include eight expanded papers from the 25th ISSTT symposium. The papers range from development of SIS mixers to optical adjustment systems for radio telescopes. The 26th ISSTT will be held in Boston, MA, USA, during March 16–18, 2015. Researchers and scientist involved in THz research are invited to attend this symposium (more details are at http://www.cfa.harvard.edu/events/2015/isstt2015/). You can access the full list of papers presented at the ISSTT symposia from the National Radio Astronomy Observatory website: http://www.nrao.edu/meetings/isstt/index.shtml Yours sincerely |
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ISSN | 2156-342X | ISBN | Medium | ||
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Notes | Approved | no | |||
Call Number | Serial | 1353 | |||
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Author | Anosov, A. A.; Nemchenko, O. Yu.; Less, Yu. A.; Kazanskii, A. S.; Mansfel'd, A. D. | ||||
Title | Possibilities of acoustic thermometry for controlling targeted drug delivery | Type | Journal Article | ||
Year | 2015 | Publication | Acoust. Phys. | Abbreviated Journal | |
Volume | 61 | Issue | 4 | Pages | 488-493 |
Keywords | acoustic thermometry, liposome suspension, thermography | ||||
Abstract | Model acoustic thermometry experiments were conducted during heating of an aqueous liposome suspension. Heating was done to achieve the liposome phase transition temperature. At the moment of the phase transition, the thermal acoustic signal achieved a maximum and decreased, despite continued heating. During subsequent cooling of the suspension, when lipids again passed through the phase transition point, the thermal acoustic signal again increased, despite a reduction in temperature. This effect is related to an increase in ultrasound absorption by the liposome suspension at the moment of the lipid phase transition. The result shows that acoustic thermography can be used to control targeted delivery of drugs mixed in thermally sensitive liposomes, the integrity of which is violated during heating to the phase transition temperature. | ||||
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Notes | Approved | no | |||
Call Number | Serial | 1130 | |||
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Author | Akhmadishina, K. F.; Bobrinetskiy, I. I.; Komarov, I. A.; Malovichko, A. M.; Nevolin, V. K.; Fedorov, G. E.; Golovin, A. V.; Zalevskiy, A. O.; Aidarkhanov, R. D. | ||||
Title | Fast-response biological sensors based on single-layer carbon nanotubes modified with specific aptamers | Type | Journal Article | ||
Year | 2015 | Publication | Semicond. | Abbreviated Journal | Semicond. |
Volume | 49 | Issue | 13 | Pages | 1749-1753 |
Keywords | carbon nanotubes, CNT detectors | ||||
Abstract | The possibility of the fabrication of a fast-response biological sensor based on a composite of single-layer carbon nanotubes and aptamers for the specific detection of proteins is shown. The effect of modification of the surface of the carbon nanotubes on the selectivity and sensitivity of the sensors is investigated. It is shown that carboxylated nanotubes have a better selectivity for detecting thrombin. | ||||
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ISSN | 1063-7826 | ISBN | Medium | ||
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Notes | Approved | no | |||
Call Number | Serial | 1783 | |||
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Author | Dube, I.; Jiménez, D.; Fedorov, G.; Boyd, A.; Gayduchenko, I.; Paranjape, M.; Barbara, P. | ||||
Title | Understanding the electrical response and sensing mechanism of carbon-nanotube-based gas sensors | Type | Journal Article | ||
Year | 2015 | Publication | Carbon | Abbreviated Journal | Carbon |
Volume | 87 | Issue | Pages | 330-337 | |
Keywords | carbon nanotubes, CNT detectors, field effect transistors, FET | ||||
Abstract | Gas sensors based on carbon nanotube field effect transistors (CNFETs) have outstanding sensitivity compared to existing technologies. However, the lack of understanding of the sensing mechanism has greatly hindered progress on calibration standards and customization of these nano-sensors. Calibration requires identifying fundamental transistor parameters and establishing how they vary in the presence of a gas. This work focuses on modeling the electrical response of CNTFETs in the presence of oxidizing (NO2) and reducing (NH3) gases and determining how the transistor characteristics are affected by gas-induced changes of contact properties, such as the Schottky barrier height and width, and by the doping level of the nanotube. From the theoretical fits of the experimental transfer characteristics at different concentrations of NO2 and NH3, we find that the CNTFET response can be modeled by introducing changes in the Schottky barrier height. These changes are directly related to the changes in the metal work function of the electrodes that we determine experimentally, independently, with a Kelvin probe. Our analysis yields a direct correlation between the ON – current and the changes in the electrode metal work function. Doping due to molecules adsorbed at the carbon-nanotube/metal interface also affects the transfer characteristics. | ||||
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ISSN | 0008-6223 | ISBN | Medium | ||
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Notes | Approved | no | |||
Call Number | Serial | 1778 | |||
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Author | Yang, Y.; Fedorov, G.; Shafranjuk, S. E.; Klapwijk, T. M.; Cooper, B. K.; Lewis, R. M.; Lobb, C. J.; Barbara, P. | ||||
Title | Electronic transport and possible superconductivity at Van Hove singularities in carbon nanotubes | Type | Journal Article | ||
Year | 2015 | Publication | Nano Lett. | Abbreviated Journal | Nano Lett. |
Volume | 15 | Issue | 12 | Pages | 7859-7866 |
Keywords | carbon nanotubes, CNT, tunable superconductivity, van Hove singularities | ||||
Abstract | Van Hove singularities (VHSs) are a hallmark of reduced dimensionality, leading to a divergent density of states in one and two dimensions and predictions of new electronic properties when the Fermi energy is close to these divergences. In carbon nanotubes, VHSs mark the onset of new subbands. They are elusive in standard electronic transport characterization measurements because they do not typically appear as notable features and therefore their effect on the nanotube conductance is largely unexplored. Here we report conductance measurements of carbon nanotubes where VHSs are clearly revealed by interference patterns of the electronic wave functions, showing both a sharp increase of quantum capacitance, and a sharp reduction of energy level spacing, consistent with an upsurge of density of states. At VHSs, we also measure an anomalous increase of conductance below a temperature of about 30 K. We argue that this transport feature is consistent with the formation of Cooper pairs in the nanotube. | ||||
Address | Department of Physics, Georgetown University , Washington, District of Columbia 20057, United States | ||||
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ISSN | 1530-6984 | ISBN | Medium | ||
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Notes | PMID:26506109; Suuplementary info (attached to pdf) DOI: 10.1021/acs.nanolett.5b02564 | Approved | no | ||
Call Number | Serial | 1782 | |||
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Author | Fedorov, G. E.; Gaiduchenko, I. A.; Golikov, A. D.; Rybin, M. G.; Obraztsova, E. D.; Voronov, B. M.; Coquillat, D.; Diakonova, N.; Knap, W.; Goltsman, G. N.; Samartsev, V. V.; Vinogradov, E. A.; Naumov, A. V.; Karimullin, K. R. | ||||
Title | Response of graphene based gated nanodevices exposed to THz radiation | Type | Conference Article | ||
Year | 2015 | Publication | EPJ Web of Conferences | Abbreviated Journal | EPJ Web of Conferences |
Volume | 103 | Issue | Pages | 10003 (1 to 2) | |
Keywords | graphene field-effect transistor, FET | ||||
Abstract | In this work we report on the response of asymmetric graphene based devices to subterahertz and terahertz radiation. Our devices are made in a configuration of a field-effect transistor with conduction channel between the source and drain electrodes formed with a CVD-grown graphene. The radiation is coupled through a spiral antenna to source and top gate electrodes. Room temperature responsivity of our devices is close to the values that are attractive for commercial applications. Further optimization of the device configuration may result in appearance of novel terahertz radiation detectors. | ||||
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ISSN | 2100-014X | ISBN | Medium | ||
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Notes | Approved | no | |||
Call Number | Serial | 1350 | |||
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Author | Shurakov, A.; Lobanov, Y.; Goltsman, G. | ||||
Title | Superconducting hot-electron bolometer: from the discovery of hot-electron phenomena to practical applications | Type | Journal Article | ||
Year | 2015 | Publication | Supercond. Sci. Technol. | Abbreviated Journal | Supercond. Sci. Technol. |
Volume | 29 | Issue | 2 | Pages | 023001 |
Keywords | HEB | ||||
Abstract | The discovery of hot-electron phenomena in a thin superconducting film in the last century was followed by numerous experimental studies of its appearance in different materials aiming for a better understanding of the phenomena and consequent implementation of terahertz detection systems for practical applications. In contrast to the competitors such as superconductor-insulator-superconductor tunnel junctions and Schottky diodes, the hot electron bolometer (HEB) did not demonstrate any frequency limitation of the detection mechanism. The latter, in conjunction with a decent performance, rapidly made the HEB mixer the most attractive candidate for heterodyne observations at frequencies above 1 THz. The successful operation of practical instruments (the Heinrich Hertz Telescope, the Receiver Lab Telescope, APEX, SOFIA, Hershel) ensures the importance of the HEB technology despite the lack of rigorous theoretical routine for predicting the performance. In this review, we provide a summary of experimental and theoretical studies devoted to understanding the HEB physics, and an overview of various fabrication routes and materials. | ||||
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ISSN | 0953-2048 | ISBN | Medium | ||
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Notes | Approved | no | |||
Call Number | Serial | 1156 | |||
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Author | Shurakov, Alexander; Maslennikov, Sergey; Tong, Cheuk-yu E.; Gol’tsman, Gregory | ||||
Title | Performance of an HEB direct detector utilizing a microwave reflection readout scheme | Type | Conference Article | ||
Year | 2015 | Publication | Proc. 26th Int. Symp. Space Terahertz Technol. | Abbreviated Journal | Proc. 26th Int. Symp. Space Terahertz Technol. |
Volume | Issue | Pages | 36 | ||
Keywords | HEB detector | ||||
Abstract | We report the results of our study on the performance of a hot electron bolometric (HEB) direct detector, operated by a microwave pump. The HEB devices used in this work were made from NbN thin film deposited on high resistivity silicon with an in-situ fabrication process. The experimental setup employed is similar to the one described in [1]. The detector chips were glued to a silicon lens clamped to a copper holder mounted on the cold plate of a liquid helium cryostat. Thermal link between the lens and the holder was maintained by a thin indium shim. The HEBs were operated at a bath temperature of about 4.4 K. Conventional phonon pump, commonly realized by raising the bath temperature of the detector, was substituted by a microwave one. In this case, a CW microwave signal is injected to the device through a directional coupler connected directly to the detector holder. The power incident on the HEB device was typically 1-2 μW, and the pump frequency was in the range of 0.5-1.5 GHz. The signal sources were 2 black bodies held at temperatures of 295 K and 77 K. A chopper wheel placed in front of the cryostat window switched the input to the detector between the 2 sources. A modulation frequency of several kilohertz was chosen in order to reduce the effects of the HEB’s flicker noise. A cold mesh filter was used to define the input bandwidth of the detector. The reflected microwave signal from the HEB device was fed into a low noise amplifier, the output of which is connected to a room temperature Schottky microwave power detector. This Schottky detector, in conjunction with a lock-in amplifier, demodulated the input signal modulation from the copper wheel. As the input load was switched, the impedance of the HEB device at the microwave pump frequency also changed in response to the incident signal power variation. Therefore the reflected microwave power follows the incident signal modulation. The derived responsivity from this detection system nicely correlates with the HEB impedance. In order to provide a quantitative description of the impedance variation of the HEB device and the impact of a microwave pump, we have numerically solved the heat balance equations written for the NbN bridge and its surrounding thermal heat sink [2]. Our model also accounts for the impact of the operating frequency of the detector because of non-uniform absorption of low-frequency photons across the NbN bridge [3]. In our measurements we varied the signal source wavelength from 2 mm down to near infrared range, and hence we indirectly performed the impedance measurements at frequencies below, around and far beyond the superconducting gap. Preliminary results show good agreement between the experiment and theoretical prediction. Further measurements are still in progress. [1] A. Shurakov et al., “A Microwave Reflection Readout Scheme for Hot Electron Bolometric Direct Detector”, to appear in IEEE Trans. THz Sci. Tech., 2015. [2] S. Maslennikov, “RF heating efficiency of the terahertz superconducting hot-electron bolometer”, http://arxiv.org/pdf/1404.5276v5.pdf, 2014. [3] W. Miao et al., “Non-uniform absorption of terahertz radiation on superconducting hot electron bolometer microbridges”, Appl. Phys. Let., 104, 052605, 2014. | ||||
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Call Number | Serial | 1158 | |||
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Author | Seliverstov, S.; Maslennikov, S.; Ryabchun, S.; Finkel, M.; Klapwijk, T. M.; Kaurova, N.; Vachtomin, Yu.; Smirnov, K.; Voronov, B.; Goltsman, G. | ||||
Title | Fast and sensitive terahertz direct detector based on superconducting antenna-coupled hot electron bolometer | Type | Journal Article | ||
Year | 2015 | Publication | IEEE Trans. Appl. Supercond. | Abbreviated Journal | IEEE Trans. Appl. Supercond. |
Volume | 25 | Issue | 3 | Pages | 2300304 |
Keywords | HEB detector responsivity, HEB model, numerical calculations, numerical model | ||||
Abstract | We characterize superconducting antenna-coupled hot-electron bolometers for direct detection of terahertz radiation operating at a temperature of 9.0 K. The estimated value of responsivity obtained from lumped-element theory is strongly different from the measured one. A numerical calculation of the detector responsivity is developed, using the Euler method, applied to the system of heat balance equations written in recurrent form. This distributed element model takes into account the effect of nonuniform heating of the detector along its length and provides results that are in better agreement with the experiment. At a signal frequency of 2.5 THz, the measured value of the optical detector noise equivalent power is 2.0 × 10-13 W · Hz-0.5. The value of the bolometer time constant is 35 ps. The corresponding energy resolution is about 3 aJ. This detector has a sensitivity similar to that of the state-of-the-art sub-millimeter detectors operating at accessible cryogenic temperatures, but with a response time several orders of magnitude shorter. | ||||
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Call Number | Serial | 953 | |||
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Author | Shurakov, A.; Tong, Cheuk-yu E.; Grimes, P.; Blundell, R.; Golt'sman, G. | ||||
Title | A microwave reflection readout scheme for hot electron bolometric direct detector | Type | Journal Article | ||
Year | 2015 | Publication | IEEE Trans. THz Sci. Technol. | Abbreviated Journal | IEEE Trans. THz Sci. Technol. |
Volume | 5 | Issue | Pages | 81-84 | |
Keywords | HEB detectors | ||||
Abstract | In this paper, we propose and present data from a fast THz detector based on the repurpose of hot electron bolometer mixers (HEB) fabricated from superconducting NbN thinfilm. This detector is essentially a traditional NbN bolometer element that operates under the influence of a microwave pump. The in-jected microwave power serves the dual purpose of enhancing the detector sensitivity and reading out the impedance changes of the device in response to incidentTHz radiation. We have measured an optical Noise Equivalent Power of 4 pW/ Hz for our detector at a bath temperature of 4.2 K. The measurement frequency was 0.83 THz and the modulation frequency was 1.48 kHz. The readout scheme is versatile and facilitates both high-speed operation as well as multi-pixel applications. |
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Call Number | RPLAB @ atomics90 @ | Serial | 950 | ||
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Author | Maezawa, Hiroyuki | ||||
Title | Application of superconducting hot-electron bolometer mixers for terahertz-band astronomy | Type | Journal Article | ||
Year | 2015 | Publication | IEICE Trans. Electronics | Abbreviated Journal | |
Volume | 98 | Issue | 3 | Pages | 196-206 |
Keywords | HEB mixer applications, HEB applications | ||||
Abstract | Recently, a next-generation heterodyne mixer detector – a hot electron bolometer (HEB) mixer employing a superconducting microbridge – has gradually opened up terahertz-band astronomy. The surrounding state-of-the-art technologies including fabrication processes, 4 K cryostats, cryogenic low-noise amplifiers, local oscillator sources, micromachining techniques, and spectrometers, as well as the HEB mixers, have played a valuable role in the development of super-low-noise heterodyne spectroscopy systems for the terahertz band. The current developmental status of terahertz-band HEB mixer receivers and their applications for spectroscopy and astronomy with ground-based, airborne, and satellite telescopes are presented. | ||||
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Notes | Approved | no | |||
Call Number | Serial | 1073 | |||
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