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Low-noise SIS mixer for far-infrared radio astronomy

Karpov, A. and Miller, D. and Rice, F. and Stern, J. A. and Bumble, B. and LeDuc, H. G. and Zmuidzinas, J. (2004) Low-noise SIS mixer for far-infrared radio astronomy. In: Millimeter and Submillimeter Detectors for Astronomy II. Proceedings of SPIE. No.5498. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, pp. 616-621. ISBN 9780819454300.

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We present a low noise SIS mixer developed for the 1.2 THz band of the heterodyne spectrometer of the Herschel Space Observatory. With the launch of the Herschel SO in 2007, this device will be among the first SIS mixers flown in space. This SIS mixer has a quasi-optical design, with a double slot planar antenna and an extended spherical lens made of pure Si. The SIS junctions are Nb/AlN/NbTiN with a critical current density of about 30 KA/cm2 and with the junction area of a quarter of a micron square. Our mixer circuit uses two SIS junctions biased in parallel. To improve the simultaneous suppression of the Josephson current in each of them, we use diamond-shaped junctions. A low loss Nb/Au micro-strip transmission line is used for the first time in the mixer circuit well above the gap frequency of Nb. The minimum uncorrected Double Sideband receiver noise is 550 K (Y=1.34). The minimum receiver noise corrected for the local oscillator beam splitter and for the cryostat window is 340 K, about 6 hv/k, the lowest value achieved thus far in the THz frequencies range.

Item Type:Book Section
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Additional Information:© 2004 Society of Photo-optical Instrumentation Engineers (SPIE).
Subject Keywords:Low noise receiver, NbTiN, Niobium, SIS receiver, THz detector
Series Name:Proceedings of SPIE
Issue or Number:5498
Record Number:CaltechAUTHORS:20190117-152601108
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Official Citation:Alexandre Karpov, David Miller, Frank R. Rice, Jeffrey A. Stern, Bruce Bumble, Henry G. LeDuc, Jonas Zmuidzinas, "Low-noise SIS mixer for far-infrared radio astronomy," Proc. SPIE 5498, Millimeter and Submillimeter Detectors for Astronomy II, (8 October 2004); doi: 10.1117/12.553190
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92352
Deposited By: Tony Diaz
Deposited On:18 Jan 2019 03:06
Last Modified:16 Nov 2021 03:49

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