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Sensor for mm and sub-mm wawelength range

Context evolution

  • CNES prospective 2014 : first priority :
    Detection of B-modes of the Cosmic Microwave Background (CMB) polarization
    (to constrain inflation models of the early Universe evolution, prior to recombination)
  • ESA cosmic vision 2015-2025 program
    M5 call end 2015 : SPICA (sub mm) retenu en phase A. En savoir plus

FOCUS progresses

Detector development along two axes :

  • High impedance bolometers
  • Kinetic Inductance Detector (KIDs)*
    (Choice was made not to develop Transistor Edge Sensors, well developed in US)

*superconducting devices using photon-assisted pair breaking to detect radiation


SI-Grid bolometers : a new start thanks to FOCUS

Assets : all silicon technology,
benefits from LETI silicon platform (semi-industrial),
HERSCHEL-PACS heritage, www.herschel.fr

A novel conception

Silicium report
SI-Grid bolometers
Type Bipol

Derived on bolometers developed for commercial use
> cost effective

Enhanced capability on the pixel two polarisations simultaneously measured, 
 multi colors (Patented)

  • New key technological processes successfully tested on test vehicles produced at Leti
  • New technological processes in synergies with R&D for large production industrial projects at CEA-Leti

> guarantee the continuity of the technology

KIDS : fast reacting developments thanks to FOCUS

• very few technological steps to make them.

• Improvement of detector arrays for the NIKA2 camera

Increase in complexity

Matrice 2000-pixels array

30 pixels (2009) {JPEG}

installed in 2015 at the 30 m IRAM telescope