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Low-noise slot antenna SIS mixers

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6 Author(s)
Zmuidzinas, J. ; California Inst. of Technol., Pasadena, CA, USA ; Ugras, N.G. ; Miller, D. ; Gaidis, M.
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We describe quasi-optical SIS mixers operating in the submillimeter band (500-750 GHz) which have very low noise, around 5 h/spl nu//k/sub B/ for the double-sideband receiver noise temperature. The mixers use a twin-slot antenna, Nb/Al-Oxide/Nb tunnel junctions fabricated with optical lithography, a two-junction tuning circuit, and a silicon hyperhemispherical lens with a novel antireflection coating to optimize the optical efficiency. We have flown a submillimeter receiver using these mixers on the Kuiper Airborne Observatory, and have detected a transition of H/sub 2//sup 18/O at 745 GHz. This directly confirms that SIS junctions are capable of low-noise mixing above the gap frequency.<>

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Applied Superconductivity, IEEE Transactions on  (Volume:5 ,  Issue: 2 )