Development of high-sensitive 1.2 mm imaging radiometer with two-polarization antenna-coupled TES-bolometer array for ground-based6-m optical telescope

摘要

We describe design of two-polarization imaging array of 7 antenna-coupled TES-bolometers. The fabrication procedureinvolves both electron beam lithography and convenient optical lithography resulting in submicron definition of TESabsorber films (down to ~ 0.2 pm) integrated within planar submm-wave antenna. Concept of matching optics betweenthe long-focus optical telescope and lens-antenna TES bolometer array is described. Two-mirror short-focusing beamconcentrator in combination with image rotator provides signal coupling to immersion lenses of the array. Each TESbolometer is coupled via microstrip transmission line to only one polarization of two-polarization crossed double-slotlens-antenna. Design of cryogenic 0.3-K system accommodating the matching optics is presented. We describemultiplexing readout scheme, which combines tomography, rotational scanning of the image and frequency domaindivision methods that drastically reduce the amount of wiring and substantially increase the final image resolution,especially for low-dimension arrays.