Spiral antenna nbn hot-electron bolometer mixer at submm requencies
Artikel i vetenskaplig tidskrift, 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, Mikroteknologi och nanovetenskap, Terahertz- och millimetervågsteknik

E.M. Gershenzon

Moscow State Pedagogical University

Victor Belitsky

Chalmers, Mikroteknologi och nanovetenskap

Hans Ekström


Erik Kollberg

Chalmers, Mikroteknologi och nanovetenskap, Terahertz- och millimetervågsteknik

Alexei Semenov

Yu. Gousev

K. Renk

Universität Regensburg

IEEE Transactions on Applied Superconductivity

1051-8223 (ISSN) 15582515 (eISSN)

Vol. 7 2 3395-3398


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