Spiral antenna nbn hot-electron bolometer mixer at submm requencies
Journal article, 1997

We have studied the phonon-cooled hot-electron bolometer (HEB) as a quasioptical mixer based on a spiral antenna designed for the 0.3-1 THz frequency band and fabricated on sapphire and high resistivity silicon substrates. HEB devices were produced from superconducting 3.5-5 nm thick NbN films with a critical temperature 10-12 K and a critical current density of approximately 10/sup 7/ A/cm/sup 2/ at 4.2 K. For these devices we reached a DSB receiver noise temperature below 1500 K, a total conversion loss of L/sub t/=16 dB in the 500-700 GHz frequency range, an IF bandwidth of 3-4 GHz and an optimal LO absorbed power of /spl sime/4 /spl mu/W. We experimentally analyzed various contributions to the conversion loss and obtained an RF coupling factor of about 5 dB, internal mixer loss of 10 dB and IF mismatch of 1 dB.

NbN film


hot-electron bolometer


S. Svechnikov

Moscow State Pedagogical University

G. N. Gol'tsman

Moscow State Pedagogical University

Boris Voronov

Moscow State Pedagogical University

P. Yagoubov

Serguei Cherednichenko

Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory

E.M. Gershenzon

Moscow State Pedagogical University

Victor Belitsky

Chalmers, Microtechnology and Nanoscience (MC2)

Hans Ekström


Erik Kollberg

Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory

Alexei Semenov

Yu. Gousev

K. Renk

University of Regensburg

IEEE Transactions on Applied Superconductivity

1051-8223 (ISSN)

Vol. 7 2 3395-3398

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Subatomic Physics

Physical Chemistry

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