ISSTT Proceedings

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Low Noise NbN Phonon-Cooled Hot-Electron Bolometer Mixers at 810 GHz

Authors:
C. Rösch, T. Lehnert, C. Schwoerer, M. Schicke, K. H. Gundlach, K. F. Schuster, F. Schaefer
Abstract:
NbN phonon-cooled superconducting hot-electron bolometric mixers with quasi-optical coupling were fabricated in a self-aligned process by means of e-beam-lithography. The mixer element consists of a 5 nm thick NbN film sputtered on a fused quartz substrate. Noise performance was investigated in the frequency range of 798 to 813 GHz for intermediate frequencies from 1.0 to 1.75 GHz. Uncorrected double sideband receiver noise temperatures of about 900 K were measured at an intermediate frequency of 1000 MHz with a 50 MHz bandpass filter. The gain bandwidth was determined by superposing two local oscillator signals and measuring the height of the discrete line at the intermediate frequency output. A 3dB-roll-off-frequency of some 1.3 GHz was obtained.
Categories:
HEB Mixers
Year:
1998
Session:
1
Full-text:
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Page Number(s):
53-61