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Start Over Author "Alexandre Karpov" Journal 1997 ieee mtt-s international microwave symposium digest
1 results on '"Alexandre Karpov"'

1. Low noise direct detector at submillimeter wavelength using SIS junction [Nb/AlO/sub x//Nb]

Author

J. Blondel, Alexandre Karpov, M. Voss, and K. H. Gundlach

Subjects
Physics, business.industry, Quantum limit, Bandwidth (signal processing), Bolometer, Detector, Niobium, chemistry.chemical_element, law.invention, Wavelength, Responsivity, chemistry, law, Optoelectronics, business, Type-II superconductor
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.

Published
2002
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