We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Electron-Phonon Decoupling NbSi CMB Bolometers.
- Authors
Marnieros, S.; Nones, C.; Dumoulin, L.; Bergé, L.; Rigaut, O.; Monfardini, A.; Camus, P.; Benoit, A.
- Abstract
Precise measurements of the cosmic microwave background (CMB) is crucial to cosmology, since any proposed model of the Universe must account for the features of this radiation. E_cient very large bolometer arrays (>10,000 pixels) constitute an important challenge for CMB observations and are actually developed by many groups worldwide. We present here an explorative new bolometer design based on a structure that simplifies the fabrication process and exhibits high sensitivity. This innovative device replaces delicate membrane-based structures and eliminates the mediation of phonons: the incoming energy is directly captured and measured in the electron bath of an appropriate sensor and the thermal decoupling is achieved via the intrinsic electron-phonon decoupling of the sensor at very low temperature. Reported results come from a 204-pixel matrix of NbSi transition edge sensors with a meander structure fabricated on a 2-inch silicon wafer using electron-beam co-evaporation and standard lithography process. To validate the application to CMB measurements, we have realized an optical calibration of our sample in the focal plane of a dilution cryostat test bench.
- Subjects
COSMIC background radiation; ELECTRON-phonon interactions; LOW temperatures; NUCLEAR counters; BOLOMETERS; SILICON; NIOBIUM
- Publication
Journal of Low Temperature Physics, 2012, Vol 167, Issue 5/6, p846
- ISSN
0022-2291
- Publication type
Article
- DOI
10.1007/s10909-012-0532-8