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A Low-Noise NbTiN Hot Electron Bolometer MixerHot electron bolometer (HEB) mixer elements, based on niobium titanium nitride (NbTiN) thin film technology, have been fabricated on crystalline quartz substrates over a 20 nm thick AlN buffer layer. The film was patterned by optical lithography, yielding bolometer elements that measure about 1 micrometer long and between 2 and 12 micrometers wide. These mixer chips were mounted in a fixed-tuned waveguide mixer block, and tested in the 600 and 800 GHz frequency range. The 3-dB output bandwidth of these mixers was determined to be about 2.5 GHz and we measured a receiver noise temperature of 270 K at 630 GHz using an intermediate frequency of 1.5 GHz. The receiver has excellent amplitude stability and the noise temperature measurements are highly repeatable. An 800 GHz receiver incorporating one of these mixer chips has recently been installed at the Sub-Millimeter Telescope in Arizona for field test and for astronomical observations.
Document ID
20020038955
Document Type
Conference Paper
Authors
Tong, C. Edward
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA United States)
Stern, Jeffrey
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA United States)
Megerian, Krikor
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA United States)
LeDuc, Henry
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA United States)
Sridharan, T. K.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA United States)
Gibson, Hugh
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA United States)
Blundell, Raymond
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA United States)
Date Acquired
August 20, 2013
Publication Date
December 1, 2001
Publication Information
Publication: Proceedings of the Twenlfth International Symposium on Space Terahertz Technology
Subject Category
Electronics And Electrical Engineering
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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