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Development of 1.25 THz SIS mixer for Herschel Space Observatory

Karpov, A. and Miller, D. and Rice, F. and Stern, J. A. and Bumble, B. and LeDuc, H. G. and Zmuidzinas, J. (2006) Development of 1.25 THz SIS mixer for Herschel Space Observatory. In: Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III. Proceedings of SPIE. No.6275. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 62751U. ISBN 9780819463401.

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We summarize the development and the delivery of two SIS mixers for the 1.1-1.25 THz band of the heterodyne spectrometer of Herschel Observatory (HSO). The quasi-optical SIS mixer has two Nb/AlN/NbTiN junctions with the area of 0.25 um^2. The Josephson critical current density in the junction is 30-50 kA/cm2. The tuning circuit integrated with SIS junction has the base electrode of Nb and a gold wire layer. With the new SIS mixers the test receiver maximum Y factor is 1.41. The minimum receiver uncorrected DSB noise temperature is 450 K. The SIS receiver noise corrected for the loss in the optics is 350-450 K across the 1100-1250 GHz band. The receiver has a uniform sensitivity in the full IF range of 4-8 GHz. The sub-micron sized SIS junction shape is optimized to ease the suppression of the Josephson current, and the receiver operation is stable. The measured mixer beam pattern is symmetrical and, in a good agreement with the requirements, has the f/d =4.25 at the central frequency of the operation band. The minimum DSB SIS receiver noise is close to 6 hv/k, the lowest value achieved thus far in the THz frequencies range.

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Additional Information:© 2006 Society of Photo-optical Instrumentation Engineers (SPIE). We would like to thank Tom J. Phillips for useful discussions, Gary S. Parks, James M. Newell, and Margaret A. Frerking for the support of this work, Lorraine V. Valenzuela and Nancy Cowardin for the quality assurance work, and Ricardo A. Paniagua from Caltech mechanical workshop for the work on the prototype of the mixer housing and for production of the critical mechanical parts of the mixer delivered for installation at Hershel Space Telescope. This work was supported by a NASA grant.
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Subject Keywords:SIS mixer, THz frequency, far infrared, low noise, Herschel space observatory, radio astronomy
Series Name:Proceedings of SPIE
Issue or Number:6275
Record Number:CaltechAUTHORS:20181109-132252579
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Official Citation:A. Karpov, D. Miller, F. Rice, J. A. Stern, B. Bumble, H. G. LeDuc, J. Zmuidzinas, } "Development of 1.25 THz SIS mixer for Herschel Space Observatory", Proc. SPIE 6275, Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III, 62751U (6 July 2006); doi: 10.1117/12.684534;
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:90801
Deposited By: Tony Diaz
Deposited On:14 Nov 2018 19:12
Last Modified:16 Nov 2021 03:35

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