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Program and Abstract Book - SRON

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19 th International Symposium on Space Terahertz Technology<br />

Terahertz heterodyne array based on NbN<br />

HEB mixers.<br />

2-1<br />

S.Cherednichenko* a , V.Drakinskiy a , B.Lecomte b , F.Dauplay b , J.-M.Krieg b ,<br />

Y.Delorme b , A.Feret b , H.-W.Hübers c , A.D.Semenov c , G.N.Gol’tsman d ,<br />

a Chalmers University of Technology, Physical Electronics laboratory, Department of<br />

Microtechnology <strong>and</strong> Nanoscience, SE-41296, Gothenburg, Sweden<br />

b Observatoire de Paris, LERMA, 77, Avenue Denfert-Rochereau, 75014, Paris,<br />

France.<br />

c German Aerospace Center (DLR), Institute of Planetary Research, 12489 Berlin,<br />

Germany.<br />

d Physical Department, State Pedagogical University of Moscow, 119891 Moscow,<br />

Russia.<br />

*serguei@chalmers.se<br />

A 16 pixel heterodyne receiver for 2.5 THz is been developed based on NbN<br />

superconducting hot-electron bolometer (HEB) mixers. The receiver uses a<br />

quasioptical RF coupling approach where HEB mixers are integrated into double<br />

dipole antennas on 1.5μm thick Si 3 N 4 / SiO 2 membranes. Miniature mirrors (one per<br />

pixel) <strong>and</strong> back short for the antenna were used to design the output mixer beam<br />

profile. The camera design allows all 16 pixel IF readout in parallel. The gain<br />

b<strong>and</strong>width of the HEB mixers on Si 3 N 4 / SiO 2 membranes was found to be about<br />

3 GHz, when an MgO buffer layers is applied on the membrane. We will also present<br />

the progress in the camera heterodyne tests.<br />

Keywords: HEB mixer, terahertz camera, NbN films, membrane, bolometer.<br />

22

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