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A Low-Noise Superconductive Nb Hot-Electron Mixer at 2.5 THz

Authors:
B.S. Karasik, M.C. Gaidis, W.R. McGrath, B. Bumble, H.G. LeDuc
Abstract:
We report on the development of a quasioptical Nb hot-electron bolometer mixer for a 2.5 THz heterodyne receiver. The devices are fabricated from a 12 nm thick Nb film, and have a 0.30µm×0.15µm in-plane size, thus exploiting diffusion as the electron cooling mechanism. The rf coupling was provided by a twin-slot planar antenna on an elliptical Si lens. A specially designed 2.5 THz system, using a CO 2-pumped FM laser as local oscillator (L0), with rf hot/cold loads enclosed in vacuum to avoid atmospheric absorption, was used in the experiment. The experimentally measured double sideband (DSB) noise temperature of the receiver was as low as 2750±250 K, with an estimated mixer noise temperature of [approx.] 900 K. These results demonstrate the low-noise operation of the diffusion-cooled bolometer mixer above 2 THz.
Categories:
Hot Electron Bolometers
Year:
1997
Session:
1
Full-text:
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Page Number(s):
55-66