ISSTT Proceedings

ISSTT Proceedings

You searched for:search icon

No Keywords
Showing 0 of items from your search. Start over 

A Low-noise NbTiN Hot Electron Bolometer Mixer

Authors:
C. Edward Tong, Jeffrey Stern, Krikor Megerian, Henry LeDuc, T. K. Sridharan, Hugh Gibson, Raymond Blundell
Abstract:
Hot 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 mm long and between 2 and 12 mm 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.
Categories:
HEB Mixers
Year:
2001
Session:
6
Full-text:
Download a PDF of this paper.
Page Number(s):
253-261