Title :
Low noise direct detector at submillimeter wavelength using SIS junction [Nb/AlO/sub x//Nb]
Author :
Karpov, A. ; Blondel, J. ; Voss, M. ; Gundlach, K.H.
Author_Institution :
Inst. de Radioastron. Millimetrique, St. Martin d´Heres, France
Abstract :
We have demonstrated the feasibility of a broad band SIS direct detector with a bandwidth up to 70 GHz around 330 GHz. The SIS detector responsivity approaches the quantum limit. The optical noise of 13 mK/spl radic/s measured with the new direct detector receiver is close to the noise of bolometer receiver developed for radioastronomy at the same wavelength. The SIS direct detector works at 4.5 K instead of 0.1-0.3 K required for bolometer receiver.
Keywords :
aluminium compounds; niobium; radioastronomy; submillimetre wave detectors; superconductive tunnelling; superconductor-insulator-superconductor devices; type II superconductors; 330 GHz; 4.5 K; 70 GHz; Nb-AlO-Nb; SIS junction; detector responsivity; optical noise; quantum assisted tunnelling; quantum limit; quasiparticle tunnel junction; submillimeter wavelength detector; Bolometers; Circuits; Niobium; Noise measurement; Optical noise; Optical receivers; Optical waveguides; Radiation detectors; Superconducting device noise; Temperature;
Conference_Titel :
Microwave Symposium Digest, 1997., IEEE MTT-S International
Conference_Location :
Denver, CO, USA
Print_ISBN :
0-7803-3814-6
DOI :
10.1109/MWSYM.1997.602949
