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19 th International Symposium on Space Terahertz Technology P2-6 Development of a 1.8-THz hot electron bolometric mixer for TELIS A.D. Semenov, H. Richter, and H.-W. Hübers Institute of Planetary Research, German Aerospace Center (DLR) Rutherfordstr. 2, 12489 Berlin, Germany (Email: Alexei.Semenov@dlr.de) P. Khosropanah SRON Netherlands Institute for Space Research, Landleven 12, 9747 AD Groningen, The Netherlands M. Hajenius, J. R. Gao, and T.M. Klapwijk Kavli Institute of NanoScience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands TELIS (TErahertz and submm LImb Sounder) is a new state-of-the-art balloon borne three channel (0.5, 0.6, and 1.8 THz) cryogenic heterodyne spectrometer, which will allow limb sounding of the Earth’s atmosphere within the submillimeter and far-infrared spectral range. The instrument is being developed by a consortium that includes the Space Research Organization of the Netherlands (SRON), the Rutherford Appleton Laboratory (RAL) in the United Kingdom and the German Aerospace Center (DLR, lead institute). TELIS will utilize state-of-the-art superconducting heterodyne technology and is designed to be compact and lightweight, while providing broad spectral coverage, high spectral resolution and an operation time larger than the typical flight duration (≈24 hours) in a single campaign. The combination of high sensitivity and extensive flight duration will allow investigation of the diurnal variation of key atmospheric short-lived radicals such as OH, HO 2 , ClO, BrO together with stable constituents such as O 3 , HCl and HOCl. Here we report measurement results of a planar double-slot antenna HEB mixer for 1.8 THz channel on TELIS. The HEB, based on a thin NbN film 1 on a high resistivity silicon substrate, has a dimension of 1.5×0.2 μm 2 . The HEB chip is glued to the rear side of a 12- mm diameter elliptical lens that has an anti-reflection coating from parylene. The DSB noise temperature was measured with an optically pumped THz gas laser operating at 1.9 THz. At an intermediate frequency (IF) of 1.5 GHz the noise temperature is 1500 K. Within the IF band of TELIS it increases from 3000 K at 4 GHz to ∼4500 K at 6 GHz. The antenna beam pattern was measured by scanning a hot source across the field-of-view of the mixer. The sidelobes are below -15 dB. Hence, the mixer fulfills the requirements set by TELIS. 1. The NbN film was provided by Moscow State Pedagogical University, Moscow, Russia. 116
19 th International Symposium on Space Terahertz Technology P3-1 AlN Barrier SIS junctions in submm heterodyne receiver: operational aspects. J. Bout 2 , A. Baryshev 1.2 , F.P. Mena 1,2 , R. Hesper 1,2 , B. Jackson 2 , W. Wild 1,2 , C.F.J. Lodewijk 3 , D. Ludkov 3 , T. Zijlstra 3 , E. van Zeijl 3 , T.M. Klapwijk 3 1 SRON Netherlands Institute for Space Research, Landleven 12, 9747 AD Groningen, The Netherlands 2 Kapteyn Astronomical Institute, University of Groningen, Landleven 12, 9747 AD Groningen, The Netherlands 3 Kavli Institute of Nanoscience, Faculty of Applied Sciences, Delft University of Technology Lorentzweg 1, 2628 CJ Delft, The Netherlands The Atacama Large Millimeter Interferometer (ALMA) is an observatory which consists of more than fifty 12 meter diameter submm telescopes, located at an altitude of 5000 m in the Atacama desert in Chile. It covers the 30-950 GHz frequency range which is divided into ten bands following the atmospheric transmission windows. ALMA front-ends will be using an Superconductor-Insulator-Superconductor (SIS) heterodyne mixers as the key sensitive elements for all of its high frequency bands. The ALMA band 9 receiver which covers 600 - 720 GHz is being developed in the Netherlands. The first eight receivers have been already built based on AlOx barrier SIS junctions mixers. These mixers have excellent noise temperature but show limited RF and IF bandwidth. Using new AlN barrier higher current density SIS junctions, it is possible to improve on the RF and IF bandwidth of SIS mixers thus making this technology significantly more attractive for the use in large series of SIS receivers. In this paper a careful comparison of the performance and operation of ALMA band 9 receivers based on AlN and AlOx barrier mixer will be presented. Sensitivity, IF/ RF coverage as well as stability and linearity of receivers will be compared based on experimental data. Routines for Josephson noise suppression in AlOx barrier mixers will be discussed in detail and its adaptation to AlN barrier mixer operation will be reported. 117
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