Efficient electron cooling in Cold Electron Bolometers

Optical Response of Strained- and Unstrained-Silicon Cold-Electron Bolometers

We describe the optical characterisation of two silicon cold-electron bolometers each consisting of a small (32 × 14 μm) island of degenerately doped siliconwith superconducting aluminium contacts. Radiation is coupled into the silicon absorber with a twin-slot antenna designed to couple to 160-GHz radiation through a silicon lens. Thefirst device has a highly doped silicon absorber, the second...

Multichroic bandpass seashell antenna with cold-electron bolometers for CMB measurements

Heterodyne mixing in diffusion-cooled superconducting aluminum hot- electron bolometers

We present microwave ~30 GHz! measurements on aluminum superconducting hot-electron bolometer ~HEB! mixers. Aluminum HEB mixers have a lower superconducting transition temperature than niobium and niobium nitride devices, and are predicted to have improved sensitivity and require less local oscillator power. The devices studied consist of a narrow superconducting aluminum microbridge with conta...

Cold electron Josephson transistor

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Fabrication of Diffusion-Cooled Hot-Electron Bolometers Using Electron-Beam Lithography

Astronomical interest in observing phenomena within the terahertz frequency spectrum has driven demand for extremely sensitive heterodyne receivers. Traditionally, niobium-based SIS tunnel junctions are used by the radio astronomy community in such receivers for observations below 700GHz. Research on novel devices for heterodyne mixing aims to extend experimental capabilities of sensitive recei...