Low noise Hot Electron Bolometer mixers for terahertz frequencies

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Presentation transcript:

Low noise Hot Electron Bolometer mixers for terahertz frequencies by S.Cherednichenko*, V.Drakinskiy . Chalmers University of Technology, Gothenburg, Sweden *serguei@chalmers.se Hot-electron bolometer (HEB) mixers are currently used in many radio astronomical projects. Low noise and LO power requirements make the device of choice for frequencies above 1THz. Herschel TELIS Band 6 (1.4-1.7 THz) Band 7 (1.6-1.9THz)

MgB2 HEB mixers: 2.3 GHz gain bandwidth for 20nm thick films HEB mixers on SiN-membranes: gain bandwidth is as large as on bulk substrates An NbN HEB on a membrane with an MgO buffer layer Si3N4/SiO2-membrane NbN film Contact pads Silicon MgO- buffer layer MgB2 HEB mixers: 2.3 GHz gain bandwidth for 20nm thick films