Abstract
NbN phonon-cooled hot electron bolometer mixers (HEBs) have been realized withnegligible contact resistance between the bolometer itself and the contact structure. Usinga combination of in situ cleaning of the NbN film and the use of an additionalsuperconducting interlayer of a 10 nm NbTiN layer between the Au of the contactstructure and the NbN film superior noise temperatures have been obtained aslow as 950 K at 2.5 THz and 750 K at 1.9 THz. Here we address in detail the DCcharacterization of these devices, the interface transparencies between the bolometers andthe contacts and the consequences of these factors on the mixer performance.
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