| Records |
| Author |
Ryabchun, S. A.; Tretyakov, I. V.; Finkel, M. I.; Maslennikov, S. N.; Kaurova, N. S.; Seleznev, V. A.; Voronov, B. M.; Goltsman, G. N. |
| Title |
Fabrication and characterisation of NbN HEB mixers with in situ gold contacts |
Type |
Conference Article |
| Year |
2008 |
Publication |
Proc. 19th Int. Symp. Space Terahertz Technol. |
Abbreviated Journal |
Proc. 19th Int. Symp. Space Terahertz Technol. |
| Volume |
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Issue |
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Pages |
62-67 |
| Keywords |
HEB, mixer, NbN, in-situ contacts |
| Abstract |
We present our recent results of the fabrication and testing of NbN hot-electron bolometer mixers with in situ gold contacts. An intermediate frequency bandwidth of about 6 GHz has been measured for the mixers made of a 3.5-nm NbN film on a plane Si substrate with in situ gold contacts, compared to 3.5 GHz for devices made of the same film with ex situ gold contacts. The increase in the intermediate frequency bandwidth is attributed to additional diffusion cooling through the improved contacts, which is further supported by the its dependence on the bridge length: intermediate frequency bandwidths of 3.5 GHz and 6 GHz have been measured for devices with lengths of 0.35 μm and 0.16 μm respectively at a local oscillator frequency of 300 GHz near the superconducting transition. At a local oscillator frequency of 2.5 THz the receiver has offered a DSB noise temperature of 950 K. When compared to the previous result of 1300 K obtained at the same local oscillator frequency for devices fabricated with an ex situ route, such a low value of the noise temperature may also be attributed to the improved gold contacts. |
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Groningen, Netherlands |
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412 |
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Thijs de Graauw; Nick Whyborn; Frank Helmich; Pieter Dieleman; Peter Roelfsema; Emmanuel Caux; Tom Phillips; Jürgen Stutzki; Douwe Beintema; Arnold Benz; Nicolas Biver; Adwin Boogert; Francois Boulanger; Sergey Cherednichenko; Odile Coeur-Joly; Claudia Comito; Emmanuel Dartois; Albrecht de Jonge; Gert de Lange; Ian Delorme; Anna DiGiorgio; Luc Dubbeldam; Kevin Edwards; Michael Fich; Rolf Güsten; Fabrice Herpin; Netty Honingh; Robert Huisman; Herman Jacobs; Willem Jellema; Jon Kawamura; Do Kester; Teun Klapwijk; Thomas Klein; Jacob Kooi; Jean-Michel Krieg; Carsten Kramer; Bob Kruizenga; Wouter Laauwen; Bengt Larsson; Christian Leinz; Rene Liseau; Steve Lord; Willem Luinge; Anthony Marston; Harald Merkel; Rafael Moreno; Patrick Morris; Anthony Murphy; Albert Naber; Pere Planesas; Jesus Martin-Pintado; Micheal Olberg; Piotr Orleanski; Volker Ossenkopf; John Pearson; Michel Perault; Sabine Phillip; Mirek Rataj; Laurent Ravera; Paolo Saraceno; Rudolf Schieder; Frank Schmuelling; Ryszard Szczerba; Russell Shipman; David Teyssier; Charlotte Vastel; Huib Visser; Klaas Wildeman; Kees Wafelbakker; John Ward; Roonan Higgins; Henri Aarts; Xander Tielens; Peer Zaal |
| Title |
The Herschel-heterodyne instrument for the far-infrared (HIFI): instrument and pre-launch testing |
Type |
Conference Article |
| Year |
2008 |
Publication |
Proc. SPIE |
Abbreviated Journal |
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| Volume |
7010 |
Issue |
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Pages |
701004 |
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422 |
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Smirnov, A. V.; Larionov, P. A.; Finkel, M. I.; Maslennikov, S. N.; Voronov, B. M.; Gol'tsman, G. N. |
| Title |
NbZr films for THz phonon-cooled HEB mixers |
Type |
Conference Article |
| Year |
2008 |
Publication |
Proc. 19th Int. Symp. Space Terahertz Technol. |
Abbreviated Journal |
Proc. 19th Int. Symp. Space Terahertz Technol. |
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Issue |
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Pages |
44-47 |
| Keywords |
HEB, NbZr, material search |
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Groningen, Netherlands |
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no |
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577 |
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Divochiy, Aleksander; Marsili, Francesco; Bitauld, David; Gaggero, Alessandro; Leoni, Roberto; Mattioli, Francesco; Korneev, Alexander; Seleznev, Vitaliy; Kaurova, Nataliya; Minaeva, Olga; Gol'tsman, Gregory; Lagoudakis, Konstantinos G.; Benkhaoul, Moushab; Lévy, Francis; Fiore, Andrea |
| Title |
Superconducting nanowire photon-number-resolving detector at telecommunication wavelengths |
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Journal Article |
| Year |
2008 |
Publication |
Nat. Photon. |
Abbreviated Journal |
Nat. Photon. |
| Volume |
2 |
Issue |
5 |
Pages |
302-306 |
| Keywords |
SSPD, photon-number-resolving |
| Abstract |
Optical-to-electrical conversion, which is the basis of the operation of optical detectors, can be linear or nonlinear. When high sensitivities are needed, single-photon detectors are used, which operate in a strongly nonlinear mode, their response being independent of the number of detected photons. However, photon-number-resolving detectors are needed, particularly in quantum optics, where n-photon states are routinely produced. In quantum communication and quantum information processing, the photon-number-resolving functionality is key to many protocols, such as the implementation of quantum repeaters1 and linear-optics quantum computing2. A linear detector with single-photon sensitivity can also be used for measuring a temporal waveform at extremely low light levels, such as in long-distance optical communications, fluorescence spectroscopy and optical time-domain reflectometry. We demonstrate here a photon-number-resolving detector based on parallel superconducting nanowires and capable of counting up to four photons at telecommunication wavelengths, with an ultralow dark count rate and high counting frequency. |
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no |
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916 |
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Steier, W. H.; Oh, M. C.; Zhang, C.; Zhang, H.; Szep, A.; Fetterman, H. R.; Chang, Y.; Erlig, H.; Tsap, B.; Dalton, L. R. |
| Title |
Electro-optic polymers and applications in next generation phase array antennas |
Type |
Miscellaneous |
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2008 |
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Pages |
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IR modulator |
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| Notes |
Presentation. The year of the publication is from the file (pdf) properties. |
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539 |
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Shitov, S. V.; Inatani, J.; Shan, W.-L.; Takeda, M; Wang, Z.; Uvarov, A. V.; Ermakov, A. B.; Uzawa, Y. |
| Title |
Measurement of emissivity of the ALMA antenna panel at 840 GHz using NbN-based heterodyne SIS receiver |
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Conference Article |
| Year |
2008 |
Publication |
Proc. 19th Int. Symp. Space Terahertz Technol. |
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Pages |
263-266 |
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SIS mixer, reflection, emissivity, mirror, space telescope, space observatory |
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no |
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580 |
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Tretyakov, I. V.; Ryabchun, S. A.; Maslennikov, S. N.; Finkel, M. I.; Kaurova, N. S.; Seleznev, V. A.; Voronov, B. M.; Gol'tsman, G.N. |
| Title |
NbN HEB mixer: fabrication, noise temperature reduction and characterization |
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Conference Article |
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2008 |
Publication |
Proc. Basic problems of superconductivity |
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HEB, mixer, noise temperature, conversion gain bandwidth |
| Abstract |
We demonstrate that in the terahertz region superconducting hot-electron mixers offer the lowest noise temperature, opening the possibility of using HTS's in the future to fabricate these devices. Specifically, a noise temperature of 950 K was measured for the receiver operating at 2.5 THz with a NbN HEB mixer, and a gain bandwidth of 6 GHz was measured at 300 GHz near Tc for the same mixer. |
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Moscow-Zvenigorod |
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no |
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591 |
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Li, T. F.; Pashkin, Yu. A.; Astafiev, O.; Nakamura, Y.; Tsai, J. S.; Im, H. |
| Title |
High-frequency metallic nanomechanical resonators |
Type |
Journal Article |
| Year |
2008 |
Publication |
Appl. Phys. Lett. |
Abbreviated Journal |
Appl. Phys. Lett. |
| Volume |
92 |
Issue |
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Pages |
043112(1)-043112(3) |
| Keywords |
nanomechanical resonator, polycrystalline metal films |
| Abstract |
We developed a technology to fabricate fully metallic doubly clamped beams working as nanomechanical resonators. Measured with a magnetomotive detection scheme, the beams, made of polycrystalline metal films, show as good quality as previously reported ones made of single crystal materials, such as Si, GaAs, AlN, and SiC. Our method is compatible with the conventional fabrication process for nanoscale electronic circuits and thus offers a possibility of easily integrating the beams into superconducting charge and flux qubits and single-electron transistors as well as coupling them to coplanar waveguide resonators. |
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no |
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621 |
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Feautrier, P.; le Coarer, E.; Espiau de Lamaestre, R.; Cavalier, P.; Maingault, L.; Villégier, J-C.; Frey, L.; Claudon, J.; Bergeard, N.; Tarkhov, M.; Poizat, J-P. |
| Title |
High-speed superconducting single photon detectors for innovative astronomical applications |
Type |
Conference Article |
| Year |
2008 |
Publication |
J. Phys.: Conf. Ser. |
Abbreviated Journal |
J. Phys.: Conf. Ser. |
| Volume |
97 |
Issue |
1 |
Pages |
10 |
| Keywords |
SSPD |
| Abstract |
Superconducting Single Photon Detectors (SSPD) are now mature enough to provide extremely interesting detector performances in term of sensitivity, speed, and geometry in the visible and near infrared wavelengths. Taking advantage of recent results obtained in the Sinphonia project, the goal of our research is to demonstrate the feasibility of a new family of micro-spectrometers, called SWIFTS (Stationary Wave Integrated Fourier Transform Spectrometer), associated to an array of SSPD, the whole assembly being integrated on a monolithic sapphire substrate coupling the detectors array to a waveguide injecting the light. This unique association will create a major breakthrough in the domain of visible and infrared spectroscopy for all applications where the space and weight of the instrument is limited. SWIFTS is an innovative way to achieve very compact spectro-detectors using nano-detectors coupled to evanescent field of dielectric integrated optics. The system is sensitive to the interferogram inside the dielectric waveguide along the propagation path. Astronomical instruments will be the first application of such SSPD spectrometers. In this paper, we describes in details the fabrication process of our SSPD built at CEA/DRFMC using ultra-thin NbN epitaxial films deposited on different orientations of Sapphire substrates having state of the art superconducting characteristics. Electron beam lithography is routinely used for patterning the devices having line widths below 200 nm and down to 70 nm. An experimental set-up has been built and used to test these SSPD devices and evaluate their photon counting performances. Photon counting performances of our devices have been demonstrated with extremely low dark counts giving excellent signal to noise ratios. The extreme compactness of this concept is interesting for space spectroscopic applications. Some new astronomical applications of such concept are proposed in this paper. |
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RPLAB @ gujma @ |
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648 |
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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. |
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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. |
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Groningen |
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no |
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1074 |
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Seleznev, V. A.; Tarkhov, M. A.; Voronov, B. M.; Milostnaya, I. I.; Lyakhno, V. Yu; Garbuz, A. S.; Mikhailov, M. Yu; Zhigalina, O. M.; Gol'tsman, G. N. |
| Title |
Deposition and characterization of few-nanometers-thick superconducting Mo-Re films |
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Journal Article |
| Year |
2008 |
Publication |
Supercond. Sci. Technol. |
Abbreviated Journal |
Supercond. Sci. Technol. |
| Volume |
21 |
Issue |
11 |
Pages |
115006 (1 to 6) |
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| Abstract |
We report on the fabrication and investigation of few-nanometers-thick superconducting molybdenum-rhenium (Mo-Re) films intended for use in nanowire single-photon superconducting detectors (SSPDs). Mo-Re films were deposited on sapphire substrates by DC magnetron sputtering of an Mo(60)-Re(40) alloy target in an atmosphere of argon. The films 2-10 nm thick had critical temperatures (Tc) from 5.6 to 9.7 K. HRTEM (high-resolution transmission electron microscopy) analysis showed that the films had a homogeneous structure. XPS (x-ray photoelectron spectroscopy) analysis showed the Mo to Re atom ratio to be 0.575/0.425, oxygen concentration to be 10%, and concentration of other elements to be 1%. |
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RPLAB @ gujma @ |
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723 |
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Bryant, Garnett W.; García de Abajo, F. Javier; Aizpurua, Javier |
| Title |
Mapping the Plasmon Resonances of Metallic Nanoantennas |
Type |
Journal Article |
| Year |
2008 |
Publication |
Nano Letters |
Abbreviated Journal |
Nano Lett. |
| Volume |
5 |
Issue |
2 |
Pages |
631-636 |
| Keywords |
optical antennas |
| Abstract |
We study the light scattering and surface plasmon resonances of Au nanorods that are commonly used as optical nanoantennas in analogy to dipole radio antennas for chemical and biodetection field-enhanced spectroscopies and scanned-probe microscopies. With the use of the boundary element method, we calculate the nanorod near-field and far-field response to show how the nanorod shape and dimensions determine its optical response. A full mapping of the size (length and radius) dependence for Au nanorods is obtained. The dipolar plasmon resonance wavelength λ shows a nearly linear dependence on total rod length L out to the largest lengths that we study. However, L is always substantially less than λ/2, indicating the difference between optical nanoantennas and long-wavelength traditional λ/2 antennas. Although it is often assumed that the plasmon wavelength scales with the nanorod aspect ratio, we find that this scaling does not apply except in the extreme limit of very small, spherical nanoparticles. The plasmon response depends critically on both the rod length and radius. Large (500 nm) differences in resonance wavelength are found for structures with different sizes but with the same aspect ratio. In addition, the plasmon resonance deduced from the near-field enhancement can be significantly red-shifted due to retardation from the resonance in far-field scattering. Large differences in near-field and far-field response, together with the breakdown of the simple scaling law must be accounted for in the choice and design of metallic λ/2 nanoantennas. We provide a general, practical map of the resonances for use in locating the desired response for gold nanoantennas. |
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RPLAB @ gujma @ |
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737 |
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Saynak, UÄŸur |
| Title |
Novel rectangular spiral antennas |
Type |
Manuscript |
| Year |
2008 |
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optical antennas |
| Abstract |
Round spiral antennas are generally designed by using Archimedean spiral geometries which have linear growth rates. To obtain smaller antennas with nearly the same performance, square spiral Archimedean geometries are also widely used instead. In this study, novel square antennas are proposed, designed and examined. At first two similar but different approaches are employed to design new antennas by considering the design procedure used to obtain log-periodic antennas. Then, the performance of these antennas is improved by considering another property of log-periodic antennas. Simulations are performed by using two different numerical methods which are Finite Difference Time Domain Method (FDTD) and Method of Moments (MoM). The results obtained from the simulations are compared with those of the Archimedean spiral antennas in terms of the frequency dependency of fundamental antenna parameters such as antenna gain and radiation pattern. The simulation results are compared with the ones obtained from the experimental study. |
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RPLAB @ gujma @ |
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750 |
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Pirandola, Stefano; Mancini, Stefano; Lloyd, Seth; Braunstein, Samuel L. |
| Title |
Continuous-variable quantum cryptography using two-way quantum communication |
Type |
Journal Article |
| Year |
2008 |
Publication |
Nature Physics |
Abbreviated Journal |
Nat. Phys. |
| Volume |
4 |
Issue |
9 |
Pages |
726-730 |
| Keywords |
fromIPMRAS |
| Abstract |
Quantum cryptography has recently been extended to continuous-variable systems, such as the bosonic modes of the electromagnetic field possessing continuous degrees of freedom. In particular, several cryptographic protocols have been proposed and experimentally implemented using bosonic modes with Gaussian statistics. These protocols have shown the possibility of reaching very high secret key rates, even in the presence of strong losses in the quantum communication channel. Despite this robustness to loss, their security can be affected by more general attacks where extra Gaussian noise is introduced by the eavesdropper. Here, we show a `hardware solution' for enhancing the security thresholds of these protocols. This is possible by extending them to two-way quantum communication where subsequent uses of the quantum channel are suitably combined. In the resulting two-way schemes, one of the honest parties assists the secret encoding of the other, with the chance of a non-trivial superadditive enhancement of the security thresholds. These results should enable the extension of quantum cryptography to more complex quantum communications. |
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RPLAB @ gujma @ |
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798 |
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| Author |
Kopp, Victor I.; Churikov, Victor M.; Genack, Azriel Z. |
| Title |
Chiral-fiber gratings sense the environment |
Type |
Conference Article |
| Year |
2008 |
Publication |
Laser Focus World |
Abbreviated Journal |
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| Volume |
44 |
Issue |
6 |
Pages |
76-79 |
| Keywords |
chiral fiber gratings, chiral gratings, from chiralphotonics |
| Abstract |
The article focuses on the use of chiral fiber gratings in sensing. It discusses the production of chiral optical fibers which are created through twisting fibers. It cites experiments concerning the function of chiral-fiber grating produced by twisting optical fibers. The process and results of the experiments are also discussed in the article. |
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850 |
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