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Koshelets, V. P., Ermakov, A. B., Filippenko, L. V., Khudchenko, A. V., Kiselev, O. S., Sobolev, A. S., et al. (2007). Superconducting integrated submillimeter receiver for TELIS. IEEE Trans. Appl. Supercond., 17(2), 336–342.
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Koshelets, V. P., Borisov, V. B., Dmitriev, P. N., Ermakov, A. B., Filippenko, L. V., Khudchenko, A. V., et al. (2006). Integrated submillimeter receiver for TELIS. Joint International Workshop “Nanosensors and Arrays of Quantum Dots and Josephson Junctions for space applications”, 10th International Workshop “From Andreev Reflection to the Earliest Universe”, .
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Yagoubov, P., Hoogeveen, R., Torgashin, M., Khudchenko, A., Koshelets, V., Suttiwong, N., et al. (2006). 550-650 GHz spectrometer development for TELIS. In Proc. 17th Int. Symp. Space Terahertz Technol. (pp. 338–341).
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Cherednichenko, S., Yagoubov, P., Il'in, K., Gol'tsman, G., & Gershenzon, E. (1997). Large bandwidth of NbN phonon-cooled hot-electron bolometer mixers. In Proc. 27th Eur. Microwave Conf. (Vol. 2, pp. 972–977). IEEE.
Abstract: The bandwidth of NbN phonon-cooled hot electron bolometer mixers has been systematically investigated with respect to the film thickness and film quality variation. The films, 2.5 to 10 nm thick, were fabricated on sapphire substrates using DC reactive magnetron sputtering. All devices consisted of several parallel strips, each 1 um wide and 2 um long, placed between Ti-Au contact pads. To measure the gain bandwidth we used two identical BWOs operating in the 120-140 GHz frequency range, one functioning as a local oscillator and the other as a signal source. The majority of the measurements were made at an ambient temperature of 4.2 K with optimal LO and DC bias. The maximum 3 dB bandwidth (about 4 GHz) was achieved for the devices made of films which were 2.5-3.5 nm thick, had a high critical temperature, and high critical current density. A theoretical analysis of bandwidth for these mixers based on the two-temperature model gives a good description of the experimental results if one assumes that the electron temperature is equal to the critical temperature.
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