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Proceedings Paper

NbN phonon-cooled hot-electron bolometer mixer for terahertz heterodyne receivers
Author(s): Gregory Naumovich Gol'tsman; Yuriy Borisovich Vachtomin; Sergey Vladimirovich Antipov; Matvey Ilyich Finkel; Sergey Nikolaevich Maslennikov; Konstantin Vladimirovich Smirnov; Stanislav Leonidovich Polyakov; Sergey Igorevich Svechnikov; Natalia Sergeevna Kaurova; Elisaveta Vyacheslavovna Grishina; Boris Moiseevich Voronov
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Paper Abstract

We present the results of our studies of NbN phonon-cooled HEB mixers at terahertz frequencies. The mixers were fabricated from NbN film deposited on a high-resistivity Si substrate with an MgO buffer layer. The mixer element was integrated with a log-periodic spiral antenna. The noise temperature measurements were performed at 2.5 THz and at 3.8 THz local oscillator frequencies for the 3 x 0.2 μm2 active area devices. The best uncorrected receiver noise temperatures found for these frequencies are 1300 K and 3100 K, respectively. A water vapour discharge laser was used as the LO source. The largest gain bandwidth of 5.2 GHz was achieved for a mixer based on 2 nm thick NbN film deposited on MgO layer over Si substrate. The gain bandwidth of the mixer based on 3.5 nm NbN film deposited on Si with MgO is 4.2 GHz and the noise bandwidth for the same device amounts to 5 GHz. We also present the results of our research into decrease of the direct detection contribution to the measured Y-factor and a possible error of noise temperature calculation. The use of a square nickel cell mesh as an IR-filter enabled us to avoid the effect of direct detection and measure apparent value of the noise temperature which was 16% less than that obtained using conventional black polyethylene IR-filter.

Paper Details

Date Published: 25 March 2005
PDF: 12 pages
Proc. SPIE 5727, Terahertz and Gigahertz Electronics and Photonics IV, (25 March 2005); doi: 10.1117/12.590490
Show Author Affiliations
Gregory Naumovich Gol'tsman, Moscow State Pedagogical Univ. (Russia)
Yuriy Borisovich Vachtomin, Moscow State Pedagogical Univ. (Russia)
Sergey Vladimirovich Antipov, Moscow State Pedagogical Univ. (Russia)
Matvey Ilyich Finkel, Moscow State Pedagogical Univ. (Russia)
Sergey Nikolaevich Maslennikov, Moscow State Pedagogical Univ. (Russia)
Konstantin Vladimirovich Smirnov, Moscow State Pedagogical Univ. (Russia)
Stanislav Leonidovich Polyakov, Moscow State Pedagogical Univ. (Russia)
Sergey Igorevich Svechnikov, Moscow State Pedagogical Univ. (Russia)
Natalia Sergeevna Kaurova, Moscow State Pedagogical Univ. (Russia)
Elisaveta Vyacheslavovna Grishina, Moscow State Pedagogical Univ. (Russia)
Boris Moiseevich Voronov, Moscow State Pedagogical Univ. (Russia)

Published in SPIE Proceedings Vol. 5727:
Terahertz and Gigahertz Electronics and Photonics IV
R. Jennifer Hwu; Kurt J. Linden, Editor(s)

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