HETERODYNE MIXING WITH NB TUNNEL-JUNCTIONS ABOVE THE GAP FREQUENCY

Authors
DELANGE G HONINGH CE KUIPERS JJ SCHAEFFER HHA PANHUYZEN RA KLAPWIJK TM VANDESTADT H DEGRAAUW MMWM
Citation
G. Delange et al., HETERODYNE MIXING WITH NB TUNNEL-JUNCTIONS ABOVE THE GAP FREQUENCY, Applied physics letters, 64(22), 1994, pp. 3039-3041
Citations number
11
Categorie Soggetti
Physics, Applied
Journal title
Applied physics letters → ACNP
ISSN journal
00036951
Volume
64
Issue
22
Year of publication
1994
Pages
3039 - 3041
Database
ISI
SICI code
0003-6951(1994)64:22<3039:HMWNTA>2.0.ZU;2-W
Abstract
The noise and gain of a heterodyne waveguide mixer employing Nb/Al2O3/ Nb superconducting tunnel junctions with an on-chip integrated tuning element are measured and analyzed at 680-750 GHz and at 840 GHz. The l owest receiver noise temperatures are 400 K (double side band) at 720 GHz and 1500 K (3000 K including the beam splitter loss) at 840 GHz. W e compare data of the pumped I-V curves with the quantum theory of mix ing and demonstrate good agreement at frequencies well above the gap f requency.