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
terahertz
hot-electron bolometer
Författare
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
Chalmers
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 3395-3398Ämneskategorier
Subatomär fysik
Fysikalisk kemi
Nanoteknik
Annan elektroteknik och elektronik
DOI
10.1109/77.622105