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Physica C Superconductivity

1.6 THz heterodyne receiver for the far infrared space telescope

Serguei Cherednichenko, M. Kroug, H Merkel, P. Khosropanah, Aurèle J. L. Adam, E. Kollberg, Denis Loudkov, Gregory N Gol'tsman, B. Voronov, Heiko Richter, Heinz‐Wilhelm Hübers

Published Aug 1, 2002• 67 citations
Publisher
DOI
10.1016/s0921-4534(02)00715-3

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We report on the development of a 1.4 THz SIS mixer. The mixer uses SIS junctions made off Nb/AlAlN/NbTiN. The junction area is 0.24 μm and the RNA= 6 Ohm μm. The junctions are diamond-like 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 matching microcircuit is made of Nb and gold. The on-chip coupling prediction is plotted below in the Fig. 1. The mixer is expected to provide a low noise operation in a 1.3 – 1.5 THz receiver. The mixer IF circuit is designed to cover 4 8 GHz band. The 1.3-1.5 THz SIS mixer is aimed for the 1.4 Terahertz channel of the Caltech Airborne Submillimeter Interstellar Medium Investigations Receiver (CASIMIR). It is a far-infrared and submillimeter heterodyne spectrometer, designed for the Stratospheric Observatory For Infrared Astronomy, (SOFIA). The goal of this work is to provide a low noise spectrometer particularly for the studies of the H2D 101 000 line around 1370 GHz. The mixer test with a limited LO power allows us to make an estimation of very good receiver performance with a higher LO levels (fig.2). The mixer test with a more powerful LO source is under way and will be presented.

•Apr 1, 2008•1 citation
We report on the development of a 1.4 THz SIS mixer. The mixer uses SIS junctions made off Nb/AlAlN/NbTiN. The junction area is 0.24 μm and the RNA= 6 Ohm μm. The junctions are diamond-like 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 matching microcircuit is made of Nb and gold. The on-chip coupling prediction is plotted below in the Fig. 1. The mixer is expected to provide a low noise operation in a 1.3 – 1.5 THz receiver. The mixer IF circuit is designed to cover 4 8 GHz band. The 1.3-1.5 THz SIS mixer is aimed for the 1.4 Terahertz channel of the Caltech Airborne Submillimeter Interstellar Medium Investigations Receiver (CASIMIR). It is a far-infrared and submillimeter heterodyne spectrometer, designed for the Stratospheric Observatory For Infrared Astronomy, (SOFIA). The goal of this work is to provide a low noise spectrometer particularly for the studies of the H2D 101 000 line around 1370 GHz. The mixer test with a limited LO power allows us to make an estimation of very good receiver performance with a higher LO levels (fig.2). The mixer test with a more powerful LO source is under way and will be presented.