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Proceedings Paper

Development of 1.25 THz SIS mixer for Herschel Space Observatory
Author(s): A. Karpov; D. Miller; F. Rice; J. A. Stern; B. Bumble; H. G. LeDuc; J. Zmuidzinas
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Paper Abstract

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 um2. 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.

Paper Details

Date Published: 6 July 2006
PDF: 5 pages
Proc. SPIE 6275, Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III, 62751U (6 July 2006); doi: 10.1117/12.684534
Show Author Affiliations
A. Karpov, California Institute of Technology (United States)
D. Miller, California Institute of Technology (United States)
F. Rice, California Institute of Technology (United States)
J. A. Stern, Microdevice Lab. (United States)
Jet Propulsion Lab. (United States)
B. Bumble, Microdevice Lab. (United States)
Jet Propulsion Lab. (United States)
H. G. LeDuc, Microdevice Lab. (United States)
Jet Propulsion Lab. (United States)
J. Zmuidzinas, California Institute of Technology (United States)


Published in SPIE Proceedings Vol. 6275:
Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III
Jonas Zmuidzinas; Wayne S. Holland; Stafford Withington; William D. Duncan, Editor(s)

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