Development of an 850 GHz waveguide receiver using tuned SIS junctions on 1 μm Si3N4 membranes

J. W. Kooi, M. S. Chan, M. Bin, Bruce Bumble, H. G. LeDuc, Christopher K Walker, T. G. Phillips

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We report preliminary development work on a 850 GHz SIS heterodyne receiver employing a tuned niobium tunnel junction on a 1 μm Si3N4 supporting membrane. Since the mixer is meant to be operated well above the superconducting gap frequency of niobium (2Δ/h≈690 GHz) special care has been taken to minimize transmission line loss. We have therefore used junctions with an integrated radial stub RF matching network to tune out the large shunt susceptance of the junction and minimize the niobium film absorption loss. Scale model measurements of the waveguide embedding impedance have been made to aid in the design of the choke structure and RF matching network. Detailed Fourier Transform Spectrometer measurements of tuned junctions or both SiO2 and silicon nitride membranes show response up to 1100 GHz and indicate that the absorption loss in the niobium film is in the order of 4-7 dB at 850 GHz, in fairly good agreement with the theoretical loss calculated from the Mattis-Bardeen theory. The junctions have a center frequency of 800 GHz which presents a 6% downshift from the designed value.

Original languageEnglish (US)
Pages (from-to)349-362
Number of pages14
JournalInternational Journal of Infrared and Millimeter Waves
Volume16
Issue number2
StatePublished - Feb 1995

Fingerprint

Niobium
niobium
Waveguides
receivers
membranes
waveguides
Membranes
chokes
Electric inductors
Tunnel junctions
shunts
scale models
Silicon nitride
silicon nitrides
tunnel junctions
embedding
transmission lines
nitrides
Spectrometers
Electric lines

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Physics and Astronomy (miscellaneous)
  • Atomic and Molecular Physics, and Optics

Cite this

Development of an 850 GHz waveguide receiver using tuned SIS junctions on 1 μm Si3N4 membranes. / Kooi, J. W.; Chan, M. S.; Bin, M.; Bumble, Bruce; LeDuc, H. G.; Walker, Christopher K; Phillips, T. G.

In: International Journal of Infrared and Millimeter Waves, Vol. 16, No. 2, 02.1995, p. 349-362.

Research output: Contribution to journalArticle

Kooi, J. W. ; Chan, M. S. ; Bin, M. ; Bumble, Bruce ; LeDuc, H. G. ; Walker, Christopher K ; Phillips, T. G. / Development of an 850 GHz waveguide receiver using tuned SIS junctions on 1 μm Si3N4 membranes. In: International Journal of Infrared and Millimeter Waves. 1995 ; Vol. 16, No. 2. pp. 349-362.
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