TY  - JOUR
AU  - Cherednichenko, Sergey
AU  - Drakinskiy, Vladimir
AU  - Berg, Therese
AU  - Khosropanah, Pourya
AU  - Kollberg, Erik
PY  - 2008
DA  - 2008//
TI  - Hot-electron bolometer terahertz mixers for the Herschel Space Observatory
T2  - Rev. Sci. Instrum.
JO  - Review of Scientific Instruments
SP  - 034501
VL  - 79
KW  - HEB mixer
KW  - HEB detector
KW  - HEB direct detector
KW  - applications
AB  - We report on low noise terahertz mixers(1.4–1.9THz) developed for the heterodyne spectrometer onboard the Herschel Space Observatory. The mixers employ double slot antenna integrated superconducting hot-electron bolometers (HEBs) made of thin NbN films. The mixer performance was characterized in terms of detection sensitivity across the entire rf band by using a Fourier transform spectrometer (from 0.5to2.5THz, with 30GHz resolution) and also by measuring the mixernoise temperature at a limited number of discrete frequencies. The lowest mixernoise temperature recorded was 750K [double sideband (DSB)] at 1.6THz and 950KDSB at 1.9THz local oscillator (LO) frequencies. Averaged across the intermediate frequency band of 2.4–4.8GHz, the mixernoise temperature was 1100KDSB at 1.6THz and 1450KDSB at 1.9THz LO frequencies. The HEB heterodyne receiver stability has been analyzed and compared to the HEB stability in the direct detection mode. The optimal local oscillator power was determined and found to be in a 200–500nW range.
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ID  - Cherednichenko_etal2008
ER  -