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Bi-layer Kinetic Inductance detectors for space observations between 80-120 GHz

A. Catalano 1 J. Goupy 2 Hélène Le Sueur 3 A. Benoit 2 O. Bourrion 1 M. Calvo 4 A. d'Addabbo L. Dumoulin 3 F. Levy-Bertrand 5 J. Macias-Perez 1 S. Marnieros 3 N. Ponthieu A. Monfardini 2
CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière
4 Cryo [2007-2015] - Cryogénie [2007-2015]
NEEL [2007-2015] - Institut Néel [2007-2015]
5 MagSup [2007-2015] - Magnétisme et Supraconductivité [2007-2015]
NEEL [2007-2015] - Institut Néel [2007-2015]
Abstract : We have developed Lumped Element Kinetic Inductance Detectors (LEKID) sensitive in the frequency band from 80 to 120~GHz. In this work, we take advantage of the so-called proximity effect to reduce the superconducting gap of Aluminium, otherwise strongly suppressing the LEKID response for frequencies smaller than 100~GHz. We have designed, produced and optically tested various fully multiplexed arrays based on multi-layers combinations of Aluminium (Al) and Titanium (Ti). Their sensitivities have been measured using a dedicated closed-circle 100 mK dilution cryostat and a sky simulator allowing to reproduce realistic observation conditions. The spectral response has been characterised with a Martin-Puplett interferometer up to THz frequencies, and with a resolution of 3~GHz. We demonstrate that Ti-Al LEKID can reach an optical sensitivity of about $1.4$ $10^{-17}$~$W/Hz^{0.5}$ (best pixel), or $2.2$ $10^{-17}$~$W/Hz^{0.5}$ when averaged over the whole array. The optical background was set to roughly 0.4~pW per pixel, typical for future space observatories in this particular band. The performance is close to a sensitivity of twice the CMB photon noise limit at 100~GHz which drove the design of the Planck HFI instrument. This figure remains the baseline for the next generation of millimetre-wave space satellites.
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Submitted on : Monday, April 13, 2015 - 3:45:04 PM
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A. Catalano, J. Goupy, Hélène Le Sueur, A. Benoit, O. Bourrion, et al.. Bi-layer Kinetic Inductance detectors for space observations between 80-120 GHz. Astronomy and Astrophysics - A&A, EDP Sciences, 2015, 580, pp.A15. ⟨10.1051/0004-6361/201526206⟩. ⟨in2p3-01141710⟩