ISSTT Proceedings

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Aluminum Sub-Micron Superconducting Hotelectron Bolometer Mixers

Authors:
I. Siddiqi, A. Verevkin, D.E. Prober, A. Skalare, B.S. Karasik, W.R. McGrath, P. Echternach, H.G. LeDuc
Abstract:
We report on microwave measurements of superconducting aluminum hot-electron bolometers (Al HEBs). Diffusion-cooled Al HEB mixers are ideal candidates for space-borne and terrestrial remote-sensing applications in the Terahertz frequency range since they are predicted to have small local oscillator (LO) power requirements, intermediate frequency (IF) bandwidths greater than or equal 10 GHz, and a noise temperature lower than that of Nb and NbN HEBs. Mixer measurements were made at an LO frequency ~30 GHz LO, with an IF in the range 0.1-7.3 GHz. For T < 0.8 K, a magnetic field H=0.1-0.3T was applied to suppress the superconductivity in the contact pads, and partly in the bridge. For a 0.6 ┬Ám long Al HEB, we measure an IF bandwidth of 4 GHz, a conversion efficiency [eta] = -8dB, and a mixer noise temperature Till 4K, DSB (Tmixer - Toutput noise/2[eta]). These results are shown to be in quantitative agreement with simple theoretical predictions.
Categories:
Hot Electron Bolometers
Year:
2000
Session:
1
Full-text:
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Page Number(s):
82-94