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
terahertz
hot-electron bolometer
Author
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
Chalmers
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) 15582515 (eISSN)
Vol. 7 2 3395-3398Subject Categories
Subatomic Physics
Physical Chemistry
Nano Technology
Other Electrical Engineering, Electronic Engineering, Information Engineering
DOI
10.1109/77.622105