Physics
Scientific paper
Mar 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002stt..conf...23t&link_type=abstract
Thirteenth International Symposium on Space Terahertz Technology, held 26-28 March 2002 at Harvard University, Cambridge, MA. O
Physics
6
Scientific paper
Quantum-limited mixer noise temperature has been achieved in Superconductor-Insulator-Superconductor (SIS) resonant mixer in the 600 - 720 GHz frequency range. Our mixer employs a single full-wave Nb/AlN/Nb tunnel junction resonator, fed by a quarter-wave transformer. The devices have low critical current density (~5 kA/cm2). The mixers were tested in a fixed-tuned waveguide mixer mount. Double-side-band receiver noise temperatures equivalent to a few quanta have been measured for a number of different devices. Using a 0.55 x 25 micron resonator, a noise temperature of 141 K was recorded at an LO frequency of 700 GHz with the mixer at 4.2 K. The noise temperature dropped to 111 K when the helium bath was pumped down to 2.8 K. High sensitivity has been attained over reasonably wide RF bandwidth, ~17%. The IF bandwidth of these mixers has also been investigated.
Blundell Ray
Leduc Henry G.
Megerian Krikor G.
Stern Jeff A.
Tong Edward C.
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