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Accession Number:
ADA063503
Title:
Quasiparticle Heterodyne Mixing in SIS Tunnel Junctions,
Corporate Author:
CALIFORNIA UNIV BERKELEY DEPT OF PHYSICS
Report Date:
1978-10-01
Abstract:
The rapid onset of quasiparticle tunneling current in superconductor-insulator-superconductor Josephson junctions at voltages above 2 deltae is being used for millimeter wave heterodyne mixing. Junctions with 2 micron diameter and RN 50 ohms have little capacitive shunting at the signal frequency of 36 GHz. Because there is no series resistance, residual capacitance can be tuned out. Single sideband conversion efficiencies of 0.18 and mixer noise temperatures as low as TM approximately 14K have been observed. Both results agree with shot noise limited mixer theory. Photon assisted tunneling effects are seen which indicate the approach to photon noise limited operation. Author
Supplementary Note:
Prepared in cooperation with National Bureau of Standards, Boulder, CO.
Pages:
0011
Contract Number:
N00014-75-C-0496
File Size:
4.54MB
