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Karasik, B. S., Il'in, K. S., Ptitsina, N. G., Gol'tsman, G. N., Gershenzon, E. M., Pechen', E. V., et al. (1998). Electron-phonon scattering rate in impure NbC films. In NASA/ADS (Y35.08).
Abstract: The study of the electron-phonon interaction in thin (20 nm) NbC films with electron mean free path l=2-13 nm gives an evidence that electron scattering is significantly modified due to the interference between electron-phonon and elastic electron scattering from impurities. The interference ~T^2-term, which is proportional to the residual resistivity, dominates over the Bloch-Grüneisen contribution to resistivity at low temperatures up to 60 K. The electron energy relaxation rate is directly measured via the relaxation of hot electrons heated by modulated electromagnetic radiation. In the temperature range 1.5 – 10 K the relaxation rate shows a weak dependence on the electron mean free path and strong temperature dependence T^n with the exponent n = 2.5-3. This behaviour is well explained by the theory of the electron-phonon-impurity interference taking into account the electron coupling with transverse phonons determined from the resistivity data.
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Kawamura, J. H., Tong, C. - Y. E., Blundell, R., Cosmo Papa, D., Hunter, T. R., Gol'tsman, G., et al. (1999). An 800 GHz NbN phonon-cooled hot-electron bolometer mixer receiver. IEEE Trans. Appl. Supercond., 9(2), 3753–3756.
Abstract: We describe a heterodyne receiver developed for astronomical applications to operate in the 350 /spl mu/m atmospheric window. The waveguide receiver employs a superconductive NbN phonon-cooled hot-electron bolometer mixer. The double sideband receiver noise temperature closely follows 1 kGHz/sup -1/ across 780-870 GHz, with the intermediate frequency centered at 1.4 GHz. The conversion loss is about 15 dB. The receiver was installed for operation at the University of Arizona/Max Planck Institute for Radio Astronomy Submillimeter Telescope facility. The instrument was successfully used to conduct test observations of a number of celestial sources in a number of astronomically important spectral lines.
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Galin, I., Schnitzer, C. A., Dengler, R. J., & Quintero, O. (1999). 177–207 GHz radiometer front end, single–side–band measurements. In Proc. 10th Int. Symp. Space Terahertz Technol. (70). Charlottesville, Virginia, USA.
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Marazita, Seven M., Kai Hui, Hesler, J. L., Bishop, W. L., & Crowe, T. W. (1999). Progress in submillimeter wavelength integrated mixer technology. In Proc. 10th Int. Symp. Space Terahertz Technol. (74). Charlottesville, Virginia.
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Hesler, J. L., Hui, K., & Crowe, T. W. (1999). A fixed–tuned 400 GHz subharmonic mixer using planar Schottky diods. In Proc. 10th Int. Symp. Space Terahertz Technol. (95). Charlottesville, Virginia, USA.
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