ISSTT Proceedings

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HEB Quasi-optical Heterodyne Receiver for THz Frequencies

Authors:
M. Kroug, S. Cherednichenko, M. Choumas, H. Merkel, E. Kollberg, H.W. Huebers, H. Richter, D. Loudkov, B. Voronov, G. Gol'tsman
Abstract:
The performance of NbN based HEB mixers has been investigated at THz frequencies in a receiver with quasi—optical coupling. The best performance is achieved with devices made from NbN films deposited on crystalline MgO substrates, with film thickness d = 3.5 nm and a critical temperature Tc = 9 - 10K. Double—side band receiver noise temperatures are 530 K at 0.6 THz, 650K at 1.6 THz and 1100 K at 2.5 THz. The intermediate frequency (IF) bandwidth is 4.5 GHz under operating conditions yielding the lowest noise temperature. Operating the bolometer at high bias voltages can increase the IF bandwidth up to 9 GHz at the expense of a drop in sensitivity by a factor of two.
Categories:
HEB Mixers
Year:
2001
Session:
6
Full-text:
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Page Number(s):
244-252