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Title:
A mm-Wave Polarisation Analyser Using LEKIDs: Strategy and Preliminary Numerical Results
Authors:
Tartari, A.; Belier, B.; Calvo, M.; Cammilleri, V. D.; Monfardini, A.; Piat, M.; Prêle, D.; Smoot, G. F.
Affiliation:
AA(APC, AstroParticule et Cosmologie, Université Paris Diderot, CNRS/IN2P3, CEA/lrfu, Observatoire de Paris, Sorbonne Paris Cité, Paris Cedex 13, France), AB(IEF, Institut dElectronique Fondamentale, Université Paris-Sud Centre scientifique dOrsay, Orsay cedex, France), AC(Institut Néel, CNRS & Université de Grenoble Dpartement MCBT, Grenoble, France), AD(APC, AstroParticule et Cosmologie, Université Paris Diderot, CNRS/IN2P3, CEA/lrfu, Observatoire de Paris, Sorbonne Paris Cité, Paris Cedex 13, France; IEF, Institut dElectronique Fondamentale, Université Paris-Sud Centre scientifique dOrsay, Orsay cedex, France), AE(Institut Néel, CNRS & Université de Grenoble Dpartement MCBT, Grenoble, France), AF(APC, AstroParticule et Cosmologie, Université Paris Diderot, CNRS/IN2P3, CEA/lrfu, Observatoire de Paris, Sorbonne Paris Cité, Paris Cedex 13, France), AG(APC, AstroParticule et Cosmologie, Université Paris Diderot, CNRS/IN2P3, CEA/lrfu, Observatoire de Paris, Sorbonne Paris Cité, Paris Cedex 13, France), AH(APC, AstroParticule et Cosmologie, Université Paris Diderot, CNRS/IN2P3, CEA/lrfu, Observatoire de Paris, Sorbonne Paris Cité, Paris Cedex 13, France; LBNL, Berkeley, CA, USA)
Publication:
Journal of Low Temperature Physics, Volume 176, Issue 3-4, pp. 524-529 (JLTP Homepage)
Publication Date:
08/2014
Origin:
CROSSREF; SPRINGER
Keywords:
Kinetic Inductance Detectors, Cosmic Microwave Background, Polarisation
Abstract Copyright:
(c) 2014: Springer Science+Business Media New York
DOI:
10.1007/s10909-013-1055-7
Bibliographic Code:
2014JLTP..176..524T

Abstract

The context of this study is the development of polarisation sensitive detectors in view of future Cosmic Microwave Background experiments. Our goal is to demonstrate the possibility to make a mm-wave polarisation analyser at 150 GHz using Lumped Element Kinetic Inductance Detectors (LEKIDs). Although LEKIDs are very attractive for the relative ease of fabrication, they have an intrinsic optical response which is weakly polarisation-senstive, i.e. orthogonal linear polarisations are absorbed with comparable efficiencies (with a separation typically not exceeding few dB). To overcome this difficulty, we achieve a polarised response by means of small () superconducting Nb wire-grids. Each grid is deposited on the rear side of the 300 micron Si substrate, on which 20 nm Al resonators are patterned, so that each pixel may in principle respond as an independent polarisation analyser. Simulations show encouraging results, with a deep (-20 dB) rejection of the unwanted polarisation. Although what we present here is not yet a polarimeter, this pilot study allows us to address some relevant questions that may be crucial in view of a full polarimetric architecture development. In particular, our first prototypes will allow to assess the behaviour of small grids, the interaction between adjacent polarised pixels, and to choose the most suitable resonator geometry. What we present here are preliminary design results about devices which are currently being realised, and soon ready for optical response characterisation.
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