Abstract
We have developed a niobium titanium nitride (NbTiN) based superconductor-insulator-superconductor (SIS) receiver to cover the 350 micron atmospheric window. This frequency band lies entirely above the energy gap of niobium (700 GHz), a commonly used SIS superconductor. The instrument uses an open structure twin-slot SIS mixer that consists of two Nb/AlN/NbTiN tunnel junctions, NbTiN thin-film microstrip tuning elements, and a NbTiN ground plane. The optical configuration is very similar to the 850 GHz waveguide receiver that was installed at the Caltech Submillimeter Observatory (CSO) in 1997. To minimize front-end loss, we employed reflecting optics and a cooled beamsplitter at 4 K. The instrument has an uncorrected receiver noise temperature of 205K DSB at 800 GHz and 410K DSB at 900 GHz. The degradation in receiver sensitivity with frequency is primarily due to an increase in the mixer conversion loss, which is attributed to the mismatch between the SIS junction and the twin-slot antenna impedance. The overall system performance has been confirmed through its use at the telescope to detect a wealth of new spectroscopic lines.
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J.W. Kooi, J. Pety, B. Bumble, C.K. Walker, H.G. LeDuc, P.L. Schaffer, and T.G. Phillips, ”A 850 GHz Waveguide Receiver employing a Niobium SIS junction fabricated on a 1μm Si3N4 Membrane,” IEEE transactions on Microwave Theory and Techniques, Vol. 46,No. 2, pp. 151–161, February 1998.
M. Bin, M. C. Gaidis, J. Zmuidzinas, T. G. Phillips and H. G. Leduc, ”Quasi-Optical SIS mixers with Normal-Metal Tuning Structures”, IEEE Transactions on Applied Superconductivity, Vol. 7(2), Part 3, pp 3584–3588, Jun. 1997.
P. Dieleman, T.M. Klapwijk, J.R. Gao, and H. van de Stadt, ”Analysis of Nb superconductor-insulator-superconductor tunnel junctions with Al striplines for THz radiation detection”, IEEE Trans. Applied Superconductivity 7, pp 2566–2569, 1997.
T.G. Phillips, J. Zmuidzinas, W.D. Langer, C. Lawrence, and J. Pearson, ”The FIRST mission”, ”#41.21, Bull. American Astronomy Society” 191, Dec 1997.
J. Zmuidzinas, G. Blake, J. Keene, T.G. Phillips, N. Erickson, P. Goldsmith, A. Harris, M. Morris, W. Langer, H. Leduc, and W. McGrath, ”A Submillimeter/far-IR heterodyne receiver for SOFIA, ”#09.06, Bull. American Astronomy Society”, 191, Dec 1997.
J.W. Kooi, J.A. Stern, G. Chattopadhyay, H.G. LeDuc, B. Bumble, and J. Zmuidzinas, ”Low-Loss NbTiN Films for THz SIS Mixer Tuning Circuits”, Int. J. IR and MM Waves, Vol 19,No 3, 1998.
J. Zmuidzinas, J. Kooi, J. Kawamura, G. Chattopadhyay, B. Bumble, H.G. LeDuc, and J.A. Stern, ”Development of SIS Mixers for 1 THz”, SPIE; International Society for Optical Engineering Proceedings, Kona, Hawaii, 1998.
B. Bumble, H.G. LeDuc, and J. Stern, ”Fabrication of Nb/AlNx/NbTiN for SIS mixer applications above 1 THz”, Ninth International Symposium on Space Terahertz Technology, Pasadena, California, March 1998.
J. Stern, B. Bumble, H.G. LeDuc, J.W. Kooi, and J. Zmuidzinas, ”Fabrication and DC-characterization of NbTiN based SIS mixers for the use between 600 and 1200 GHz”, Ninth International Symposium on Space Terahertz Technology, Pasadena, California, March 1998.
J. Zmuidzinas, private communication
J. Zmuidzinas and H.G LeDuc, ”Quasi-optical slot antenna SIS mixers, IEEE Trans. Microwaves Theory and Techniques, vol. 40,No. 9,pp. 1797–1804, Sept. 1992.
J. Zmuidzinas, H.G. Leduc, J.A. Stern, and S.R. Cypher, ”Two-junction tuning circuits for submillimeter SIS mixers, ”IEEE Transactions on Microwave Theory and Techniques, Vol. MTT-42,No. 4, pp 698–706, Apr 1994.
M. Gaidis, H. G. LeDuc, M. Bin, D. Miller, J. A. Stern and J. Zmuidzinas, ”Characterization of low noise quasi-optical SIS mixers for the Submillimeter Band”, IEEE transactions on Microwave Theory and Techniques, Vol. 44,No. 7, pp. 1130–1139, July 1996.
J. Kawamura, J. Chen, D. Miller, J. Kooi, J. Zmuidzinas, B. Bumble, H.G. LeDuc, and J.A. Stern, ”Low-Noise Submillimeter-wave NbTiN superconducting tunnel junction mixers”, Applied Physics Letters, Vol 75, Number 25, December 1999.
D.F. Filipovic, S.S. Gearhart, and G. M. Rebeiz, ”Double-Slot Antennas on Extended Hemisherical and Elliptical Silicon Dielectric Lenses”, IEEE Transactions on Microwave Theory and Techniques, Oct. 1993.
Custom Microwave Inc., 940 Boston Avenue, Lonmont, Co 80501.
RPG Physics, Birkenmaarstrasse 10, 53340 Meckenheim, Germany.
H.B Callen and T.A. Welton, ”Irreversibility and generalized noise,” Phys. Rev., vol 83,no. 1, pp 34–40, July 1951.
A.R. Kerr, M.J. Feldman, and S.K. Pan, ”Receiver noise temperature, the quantum noise limit, and the role of zero-point flucuations,” NRAO, Charlottesville, VA, Electron. Div., Internal Rep. 304, Sept. 1996.
R. Blundell, R.E. Miller, and K.H. Gundlach, “Understanding noise in SIS receivers,” Int, J. Infrared and Millimeter Waves, Vol. 13,no. 1, pp 3–26, 1992.
Q. Ke, and M.J. Feldman, “A technique for noise measurements of SIS receivers,” IEEE transactions on Microwave Theory and Techniques, Vol. 42, pp. 752–755, April 1994.
P. Dieleman, H.G. Bukkems, T.M. Klapwijk, M. Schicke, and K.H. Gundlach, ”Observation of Andreev reflection enhanced shot noise,” Phys. Rev Letters 79, pp. 3486–3489, 1997.
J. Cernicharo, J. R. Pardo, E. Gonzalez-Alfonso, E. Serabyn, T. G. Phillips, D. Benford and D. Mehringer, ”Physical conditions in shocked regions of Orion from ground-based observations of H2O”, Astrophysical Journal, 520, L131–L134, 1999.
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Kooi, J.W., Kawamura, J., Chen, J. et al. A Low Noise NbTiN-Based 850 GHz SIS Receiver for the Caltech Submillimeter Observatory. International Journal of Infrared and Millimeter Waves 21, 1357–1373 (2000). https://doi.org/10.1023/A:1026444721454
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DOI: https://doi.org/10.1023/A:1026444721454