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Author Gorokhov, G.; Bychanok, D.; Gayduchenko, I.; Rogov, Y.; Zhukova, E.; Zhukov, S.; Kadyrov, L.; Fedorov, G.; Ivanov, E.; Kotsilkova, R.; Macutkevic, J.; Kuzhir, P. url  doi
openurl 
  Title THz spectroscopy as a versatile tool for filler distribution diagnostics in polymer nanocomposites Type Journal Article
  Year 2020 Publication Polymers (Basel) Abbreviated Journal Polymers (Basel)  
  Volume 12 Issue 12 Pages 3037 (1 to 14)  
  Keywords THz spectroscopy; nanocomposites, percolation threshold, time-domain spectroscopy, time-domain spectrometer, TDS  
  Abstract Polymer composites containing nanocarbon fillers are under intensive investigation worldwide due to their remarkable electromagnetic properties distinguished not only by components as such, but the distribution and interaction of the fillers inside the polymer matrix. The theory herein reveals that a particular effect connected with the homogeneity of a composite manifests itself in the terahertz range. Transmission time-domain terahertz spectroscopy was applied to the investigation of nanocomposites obtained by co-extrusion of PLA polymer with additions of graphene nanoplatelets and multi-walled carbon nanotubes. The THz peak of permittivity's imaginary part predicted by the applied model was experimentally shown for GNP-containing composites both below and above the percolation threshold. The physical nature of the peak was explained by the impact on filler particles excluded from the percolation network due to the peculiarities of filler distribution. Terahertz spectroscopy as a versatile instrument of filler distribution diagnostics is discussed.  
  Address Institute of Photonics, University of Eastern Finland, Yliopistokatu 7, FI-80101 Joensuu, Finland  
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  Language English Summary Language Original Title  
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  ISSN (down) 2073-4360 ISBN Medium  
  Area Expedition Conference  
  Notes PMID:33353036; PMCID:PMC7767186 Approved no  
  Call Number Serial 1780  
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Author Samsonova, Alena; Zolotov, Philipp; Baeva, Elmira; Lomakin, Andrey; Titova, Nadezhda; Kardakova, Anna; Goltsman, Gregory doi  openurl
  Title Signatures of surface magnetic disorder in thin niobium films Type Journal Article
  Year 2021 Publication IEEE Trans. Appl. Supercond. Abbreviated Journal  
  Volume Issue Pages 1-1  
  Keywords Temperature measurement, Temperature dependence, Superconducting magnets, Superconducting transition temperature, Substrates, Resistance, Scattering  
  Abstract We present our studies on the evolution of the normal and superconducting properties with thickness of thin Nb films with a low level of non-magnetic disorder (kFl 150 for the thickest film in the set). The analysis of the superconducting behavior points to the presence of magnetic moments, hidden in the native oxide on the surface of Nb films. Using the Abrikosov-Gorkov theory, we obtain the density of surface magnetic moments of 1013 cm-2, which is in agreement with the previously reported data for Nb films.  
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  ISSN (down) 1051-8223 ISBN Medium  
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  Notes Approved no  
  Call Number Serial 1162  
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Author Prober, D. E. openurl 
  Title Superconducting terahertz mixer using a transition-edge microbolometer Type Journal Article
  Year 1993 Publication Appl. Phys. Lett. Abbreviated Journal Appl. Phys. Lett.  
  Volume 62 Issue 17 Pages 2119-2121  
  Keywords HEB mixer, NbN, TES  
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  Notes Recommended by Klapwijk Approved no  
  Call Number Serial 244  
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Author Miller, Aaron J.; Lita, Adriana E.; Calkins, Brice; Vayshenker, Igor; Gruber, Steven M.; Nam, Sae Woo openurl 
  Title Compact cryogenic self-aligning fiber-to-detector coupling with losses below one percent Type Journal Article
  Year 2011 Publication Optics Express Abbreviated Journal Opt. Express  
  Volume 19 Issue 10 Pages 9102-9110  
  Keywords TES  
  Abstract We present a compact packaging technique for coupling light from a single-mode telecommunication fiber to cryogenic single-photon sensitive devices. Our single-photon detectors are superconducting transition-edge sensors (TESs) with a collection area only a factor of a few larger than the area of the fiber core which presents significant challenges to low-loss fiber-to-detector coupling. The coupling method presented here has low loss, cryogenic compatibility, easy and reproducible assembly and low component cost. The system efficiency of the packaged single-photon counting detectors is verified by the “triplet method” of power-source calibration along with the “multiple attenuator” method that produces a calibrated single-photon flux. These calibration techniques, when used in combination with through-wafer imaging and fiber back-reflection measurements, give us confidence that we have achieved coupling losses below 1 % for all devices packaged according to the self-alignment method presented in this paper.  
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  Notes Approved no  
  Call Number RPLAB @ gujma @ Serial 666  
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Author Hoevers, H. F. C.; Bento, A. C.; Bruijn, M. P.; Gottardi, L.; Korevaar, M. A. N.; Mels, W. A.; de Korte, P. A. J. openurl 
  Title Thermal fluctuation noise in a voltage biased superconducting transition edge thermometer Type Journal Article
  Year 2000 Publication Applied Physics Letters Abbreviated Journal Appl. Phys. Lett.  
  Volume 77 Issue 26 Pages 4421-4424  
  Keywords TES; bolometer; thermal fluctuation noise; TFN  
  Abstract The current noise at the output of a microcalorimeter with a voltage biased superconducting transition edge thermometer is studied in detail. In addition to the two well-known noise sources: thermal fluctuation noise from the heat link to the bath and Johnson noise from the resistive thermometer, a third noise source strongly correlated with the steepness of the thermometer is required to fit the measured noise spectra. Thermal fluctuation noise, originating in the thermometer itself, fully explains the additional noise. A simple model provides quantitative agreement between the observed and calculated noise spectra for all bias points in the superconducting transition.  
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  Notes Approved no  
  Call Number RPLAB @ gujma @ Serial 759  
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