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Author Słysz, W.; Węgrzecki, M.; Bar, J.; Grabiec, P.; Gol'tsman, G. N.; Verevkin, A.; Sobolewski, R.
Title NbN superconducting single-photon detector coupled with a communication fiber Type Journal Article
Year 2005 Publication Elektronika : konstrukcje, technologie, zastosowania Abbreviated Journal
Volume 46 Issue 6 Pages 51-52
Keywords NbN SSPD, SNSPD
Abstract We present novel superconducting single-photon detectors (SSPDs), ba­sed on ultrathin NbN films, designed for fiber-based quantum communica­tions (lambda = 1.3 žm and 1.55 žm). For fiber-based operation, our SSPDs contain a special micromechanical construction integrated with the NbN structure, which enables efficient and mechanically very stabile fiber coupling. The detectors combine GHz counting rate, high quantum efficiency and very low level of dark counts. At 1.3 – 1.55 žm wavelength range our detector exhibits a quantum efficiency up to 10%.
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Language Polish Summary Language Original Title
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Call Number (up) Serial 1481
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Author Jiang, L.; Zhang, W.; Yao, Q. J.; Lin, Z. H.; Li, J.; Shi, S. C.; Svechnikov, S. I.; Vachtomin, Y. B.; Antipov, S. V.; Voronov, B. M.; Kaurova, N. S.; Gol'tsman, G. N.
Title Characterization of a quasi-optical NbN superconducting hot-electron bolometer mixer Type Conference Article
Year 2005 Publication Proc. PIERS Abbreviated Journal Proc. PIERS
Volume 1 Issue 5 Pages 587-590
Keywords NbN HEB mixers
Abstract In this paper, we report the performance of a quasi-optical NbN superconducting HEB (hot electron bolome-ter) mixer measured at 500 GHz. The quasi-optical NbN superconducting HEB mixer is cryogenically cooled bya 4-K close-cycled refrigerator. Its receiver noise temperature and conversion gain are thoroughly investigatedfor different LO pumping levels and dc biases. The lowest receiver noise temperature is found to be approxi-mately 1200 K, and reduced to about 445 K after correcting theloss of the measurement system. The stabilityof the mixer’s IF output power is also demonstrated.
Address Hangzhou, China
Corporate Author Thesis
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ISSN 1931-7360 ISBN Medium
Area Expedition Conference Progress In Electromagnetics Research Symposium
Notes Approved no
Call Number (up) Serial 1482
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Author Loudkov, D.; Tong, C.-Y. E.; Blundell, R.; Kaurova, N.; Grishina, E.; Voronov, B.; Gol’tsman, G.
Title An investigation of the performance of the superconducting HEB mixer as a function of its RF embedding impedance Type Journal Article
Year 2005 Publication IEEE Trans. Appl. Supercond. Abbreviated Journal IEEE Trans. Appl. Supercond.
Volume 15 Issue 2 Pages 472-475
Keywords waveguide NbN HEB mixers
Abstract We have conducted an investigation of the optimal embedding impedance for a waveguide superconducting hot-electron bolometric (HEB) mixer. Three mixer chip designs for 800 GHz, offering nominal embedding resistances of 70 /spl Omega/, 35 /spl Omega/, and 15 /spl Omega/, have been developed. We used both High Frequency Structure Simulator (HFSS) software and scale model impedance measurements in the design process. We subsequently fabricated HEB mixers to these designs using 3-4 nm thick NbN thin film. Receiver noise temperature measurements and Fourier Transform Spectrometer (FTS) scans were performed to determine the optimal combination of embedding impedance and normal-state resistance for a 50 Ohm IF load impedance. A receiver noise temperature of 440 K was measured at a local oscillator frequency 850 GHz for a mixer with normal state resistance of 62 /spl Omega/ incorporated into a circuit offering a nominal embedding impedance of 70 /spl Omega/. We conclude from our data that, for low noise operation, the normal state resistance of the HEB mixer element should be close to the embedding impedance of the mixer mount.
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Notes Approved no
Call Number (up) 1439677 Serial 1464
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Author de Graauw, T.; Caux, E.; Guesten, R.; Helmich, F.; Pearson, J.; Phillips, T. G.; Schieder, R.; Tielens, X.; Saraceno, P.; Stutzki, J.; Wafelbakker, C. K.; Whyborn, N. D.
Title The Herschel-heterodyne instrument for the far-infrared (HIFI) Type Conference Article
Year 2005 Publication Bulletin of the American Astronomical Society Abbreviated Journal
Volume Issue Pages 1219
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Language Summary Language Original Title
Series Editor Series Title Bulletin of the American Astronomical Society Abbreviated Series Title
Series Volume 37 Series Issue Edition
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Area Expedition Conference
Notes Approved no
Call Number (up) ref2005AAS...207.3503D Serial 420
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Author An, Zhenghua; Chen, Jeng-Chung; Ueda, T.; Komiyama, S.; Hirakawa, K.
Title Infrared phototransistor using capacitively coupled two-dimensional electron gas layers Type Journal Article
Year 2005 Publication Applied Physics Letters Abbreviated Journal Appl. Phys. Lett.
Volume 86 Issue Pages 172106 - 172106-3
Keywords 2DEG
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Notes Approved no
Call Number (up) RPLAB @ akorneev @ Serial 603
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Author Alda, Javier; Rico-García, José M.; López-Alonso, José M.; Boreman, G.
Title Optical antennas for nano-photonic applications Type Journal Article
Year 2005 Publication Nanotechnology Abbreviated Journal Nanotech.
Volume 16 Issue 5 Pages S230-S234
Keywords optical antennas
Abstract Antenna-coupled optical detectors, also named optical antennas, are being developed and proposed as alternative detection devices for the millimetre, infrared, and visible spectra. Optical and infrared antennas represent a class of optical components that couple electromagnetic radiation in the visible and infrared wavelengths in the same way as radioelectric antennas do at the corresponding wavelengths. The size of optical antennas is in the range of the detected wavelength and they involve fabrication techniques with nanoscale spatial resolution. Optical antennas have already proved and potential advantages in the detection of light showing polarization dependence, tuneability, and rapid time response. They also can be considered as point detectors and directionally sensitive elements. So far, these detectors have been thoroughly tested in the mid-infrared with some positive results in the visible. The measurement and characterization of optical antennas requires the use of an experimental set-up with nanometric resolution. On the other hand, a computation simulation of the interaction between the material structures and the incoming electromagnetic radiation is needed to explore alternative designs of practical devices.
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Notes Approved no
Call Number (up) RPLAB @ gujma @ Serial 734
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Author González, F. J.; Boreman, G. D.
Title Comparison of dipole, bowtie, spiral and log-periodic IR antennas Type Journal Article
Year 2005 Publication Infrared Physics & Technology Abbreviated Journal Inf Phys & Technol
Volume 46 Issue 5 Pages 418-428
Keywords optical antennas; Microbolometer; Infrared antennas; Antenna efficiency; Antenna-coupled detectors
Abstract Antenna-coupled microbolometers use planar lithographic antennas to couple infrared radiation into a bolometer with sub-micron dimensions. In this paper four different types of infrared antennas were fabricated on thin grounded-substrates and coupled to microbolometers. Dipole, bowtie, spiral and log-periodic IR antenna-coupled detectors were measured at 10.6 μm and their performance compared. A new method to calculate the radiation efficiency based on the spatial and angular response of infrared antennas is presented and used to evaluate their performance. The calculated radiation efficiency for the dipole, bowtie, spiral and log-periodic IR antennas was 20%, 37%, 25% and 46% respectively. A dipole-length study was performed and shows that the quasistatic value of the effective permittivity accurately describes the incident wavelength in the substrate at infrared frequencies for antennas on a thin substrate.
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Call Number (up) RPLAB @ gujma @ Serial 739
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Author Gonzalez, F.J.; Ilic, B.; Alda, J.; Boreman, G.D.
Title Antenna-coupled infrared detectors for imaging applications Type Journal Article
Year 2005 Publication IEEE J. Sel. Topics Quantum Electron. Abbreviated Journal
Volume 11 Issue 1 Pages 117 - 120
Keywords optical antennas
Abstract Infrared focal plane arrays (IRFPAs) are a critical component in advanced infrared imaging systems. IRFPAs are made up of two parts, a detector array and a readout integrated circuit (ROIC) multiplexer. Current ROIC technology has typical pitch sizes of 20×20 to 50×50 μm2. In order to make antenna-coupled detectors suited for infrared imaging systems, two-dimensional (2-D) arrays have been fabricated that cover a whole pixel area with the penalty of increasing the noise figure of the detector and, therefore, reducing its performance. By coupling a Fresnel zone plate lens to a single element antenna-coupled detector, infrared radiation can be collected over a typical pixel area and still keep low-noise levels. A Fresnel zone plate lens coupled to a single-element square-spiral-coupled infrared detector has been fabricated and its performance compared to single element antenna-coupled detectors and 2-D arrays of antenna coupled detectors. Measurements made at 10.6 μm showed a two-order-of-magnitude increase in SNR and a ~× increase in D* as compared to 2-D arrays of antenna-coupled detectors.
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Notes Approved no
Call Number (up) RPLAB @ gujma @ Serial 741
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Author Encrenaz, Thérèse
Title Neutral Atmospheres of the Giant Planets: An Overview of Composition Measurements Type Journal Article
Year 2005 Publication Space Science Reviews Abbreviated Journal Space Sci Rev
Volume 116 Issue 1-2 Pages 99-119
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ISSN 0038-6308 ISBN Medium
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Notes Approved no
Call Number (up) RPLAB @ s @ Serial 443
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Author Goizel, Annesco; Smith, David
Title Thermometry down to 300 mK for space instrumentation Type Miscellaneous
Year 2005 Publication Abbreviated Journal
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Notes Approved no
Call Number (up) RPLAB @ s @ Serial 444
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