Bolometer arrays development in the DCMB French collaboration

Abstract

International audienceBolometers cooled to very low temperature are currently the most sensitive detectors for low spectral resolution detection of millimetre and sub-millimetre wavelengths. The best performances of the state-of-the-art bolometers allow to reach sensitivities below the photon noise of the Cosmic Microwave Background for example. Since 2003, a french R&D effort called DCMB ("Developpement Concerte de Matrices de Bolometres") has been organised between different laboratories to develop large bolometers arrays for astrophysics observations. Funded by CNES and CNRS, it is intended to get a coherent set of competences and equipments to develop very cold bolometers arrays by microfabrication. Two parallel developments have been made in this collaboration based on the NbSi alloy either semi-conductive or superconducting depending on the proportion of Nb. Multiplexing schemes have been developed and demonstrated for these two options. I will present the latest developments made in the DCMB collaboration and future prospects

Development of NbSi TES bolometer arrays for submillimeter astronomy

“…We have developed our second dedicated demonstrator ASIC using AMS BiCMOS SiGe 0.35 µm technology for the readout of an array of three columns of 8 SQUIDs/TES each [11]. A topology coupling the amplification stage to the analogue multiplexer of the three columns was designed using SiGe Heterojunction Bipolar Transistors (HBT) with a dissipated power of about 20 mW.…”