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Author Hans Ekstrom; Karasik, Boris S.; Kollberg, Erik L.; Sigfrid Yngvesson openurl 
  Title Conversion gain and noise of niobium superconducting hot–electron–mixers Type Journal Article
  Year 1995 Publication IEEE Trans. Appl. Supercond. Abbreviated Journal  
  Volume 43 Issue 4 Pages 938-947  
  Keywords Nb HEB mixers  
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  Call Number Serial 254  
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Author Kerr, A. R. openurl 
  Title Some fundamental and practical limits on broadband matching tocapacitive devices, and the implications for SIS mixer design Type Journal Article
  Year 1995 Publication IEEE Trans. Microw. Theory Techn. Abbreviated Journal  
  Volume 43 Issue 1 Pages 2-13  
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  Call Number Serial 256  
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Author de Lange, G.; Kuipers, J. J.; Klapwijk, T. M.; Panhuyzen, R. A.; van de Stadt, H.; de Graauw, M. W. M. openurl 
  Title Superconducting resonator circuits at frequencies above the gap frequency Type Journal Article
  Year 1995 Publication J. Appl. Phys. Abbreviated Journal  
  Volume 77 Issue 4 Pages 1795-1804  
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  Call Number Serial 257  
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Author Hesler, J. L.; Crowe, T. W.; Bradley, R. F.; Pan, S. K.; Chattopadhyay, G. openurl 
  Title The design, construction and evaluation of a 585 GHz planar Schottky mixer Type Conference Article
  Year 1995 Publication Proc. 6th Int. Symp. Space Terahertz Technol. Abbreviated Journal  
  Volume Issue Pages 34-43  
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  Publisher Place of Publication Pasadena, Ca Editor  
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  Call Number Serial 259  
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Author Semenov, A. D.; Nebosis, R. S.; Gousev, Yu. P.; Heusinger, M. A.; Renk, K. F. openurl 
  Title Analysis of the nonequilibrium photoresponse of superconducting films to pulsed radiation by use of a two-temperature model Type Journal Article
  Year 1995 Publication Phys. Rev. B Abbreviated Journal Phys. Rev. B  
  Volume 52 Issue 1 Pages 581-590  
  Keywords HEB, NbN phonon scecific heat, Cp  
  Abstract Photoresponse of a superconducting film in the resistive state to pulsed radiation has been studied in the framework of a model assuming that two different effective temperatures can be assigned to the quasiparticle and phonon nonequilibrium distributions. The coupled electron-phonon-substrate system is described by a system of time-dependent energy-balance differential equations for effective temperatures. An analytical solution of the system is given and calculated voltage transients are compared with experimental photoresponse signals taking into account the radiation pulse shape and the time resolution of the readout electronics. It is supposed that a resistive state (vortices, fluxons, network of intergrain junctions, hot spots, phase slip centers) provides an ultrafast connection between electron temperature changes and changes of the film resistance and thus plays a minor role in the temporal evolution of the response. In accordance with experimental observations a two-component response was revealed from simulations. The slower component corresponds to a bolometric mechanism while the fast component is connected with the relaxation of the electron temperature. Calculated photoresponse transients are presented for different ratios of the electron and phonon specific heat, radiation pulse durations and fluences, and frequency band passes of registration electronics. From the amplitude of the bolometric component we determine the radiation energy absorbed in a film. This enables us to reveal an intrinsic electron-phonon scattering time even if it is much shorter than the time resolution of readout electronics. We analyze experimental voltage transients for NbN, YBa2Cu3O7, and TlBa2Ca2Cu3O9 superconducting films and find the electron-phonon interaction times at the transition temperatures of 17, 2.5, and 1.8 ps, respectively. The values are in reasonable agreement with data of other experiments.  
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  Call Number Serial 903  
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