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Karpov A, Miller D, Stern JA, Bumble B, LeDuc HG, Zmuidzinas J. Low noise NbTiN 1.25 THz SIS mixer for Herschel Space Observatory. In: Proc. 16th Int. Symp. Space Terahertz Technol. Göteborg, Sweden; 2005. 450.
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Kenyon M, Day PK, Bradford CM, Bock JJ, Leduc HG. Background-limited membrane-isolated TES bolometers for far-IR/submillimeter direct-detection spectroscopy. Nucl. Instr. & Meth. Phys. Res. A. 2006;559:456–8.
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Karpov A, Miller D, Rice F, Stern JA, Bumble B, LeDuc HG, et al. Development of 1.25 THz SIS mixer for Herschel Space Observatory. In: Zmuidzinas J, Holland WS, editors. Proc. SPIE. Vol 6275.; 2006. 62751.
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Tong CYE, Blundell R, Bumble B, Stern JA, LeDuc HG. Sub-Millimeter distributed quasiparticle receiver employing a non-Linear transmission line. In: Proc. 7th Int. Symp. Space Terahertz Technol.; 1996. 47.
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Tong CYE, Blundell R, Paine S, Papa DC, Kawamura J, Stern J, et al. Design and characterization of a 250-350 GHz fixed-tuned superconductor-insulator-insulator receiver. IEEE Trans. Microw. Theory Techn.. 1996;44(9):1548–56.
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Wyss RA, Karasik BS, McGrath WR, Bamble B, LeDuc H. Noise and bandwidth measurements of diffusion–cooled Nb hot–electron bolometer mixers at frequencies above the superconductive energy gap. In: Proc. 10th Int. Symp. Space Terahertz Technol. Charlottesville, Virginia; 1999. p. 215–29.
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Chattopadhyay G, Rice F, Miller D, LeDuc HG, Zmuidzinas J. A 530-GHz balanced mixer. IEEE Microw. and Guided Wave Lett.. 1999;9(11):467–9.
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Karpov A, Miller D, Rice F, Zmuidzinas J, Stern JA, Bumble B, et al. Low noise 1.2 THz SIS receiver. In: Jet Propulsion Laboratory CIit.u.t.e of T, editor. Proc. 12th Int. Symp. Space Terahertz Technol. San Diego, CA, USA; 2001. p. 21–2.
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Burke PJ, Schoelkopf RJ, Prober DE, Skalare A, Karasik BS, Gaidis MC, et al. Mixing and noise in diffusion and phonon cooled superconducting hot-electron bolometers. J. Appl. Phys.. 1999;85(3):1644–53.
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Karpov A, Miller D, Stern JA, Bumble B, LeDuc HG, Zmuidzinas J. Broadband SIS mixer for 1 THz Band. In: Proc. 20th Int. Symp. Space Terahertz Technol.; 2009. p. 35.
Abstract: We report the development of a low noise and broadband SIS mixer aimed for 1 THz channel of the Caltech Airborne Submillimeter Interstellar Medium Investigations Receiver (CASIMIR), designed for the Stratospheric Observatory for Far Infrared Astronomy, (SOFIA). The mixer uses an array of 0.24 µm² Nb/Al-AlN/NbTiN SIS junctions with critical current density of 30-50 KA/cm². The junctions are shaped in order to optimize the suppression of the Josephson DC currents. We are using a double slot planar antenna to couple the mixer chip with the telescope beam. The RF matching microcircuit is made using Nb and gold films. The mixer IF circuit is designed to cover 4 – 8 GHz band. A test receiver with the new mixer has a low noise operation in a 0.87 – 1.12 THz band. The minimum DSB receiver noise measured at 1 THz is 260 K (Y=1.64), apparently the lowest reported up to date. The receiver noise corrected for the loss in the LO injection beam splitter and in the cryostat window is 200 K. The combination of a broad operation band of about 250 GHz with a low receiver noise is making the new mixer a useful element for application at SOFIA. We will discuss the prospective of a further improvement of the sensitivity and extension of the upper frequency of operation of SIS mixer.
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