1. Low noise Hot Electron Bolometer mixers for terahertz frequencies
by S.Cherednichenko*, V.Drakinskiy Chalmers University of Technology, Gothenburg, Sweden
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 ( THz)
Band 7 ( THz)

2. 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