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Spectrométrie de Fourier intégrée pour l'astronomie millimétrique

Abstract : For the last decades, millimeter wavelength observations allowed a large improvement of our knowledge of the universe in particular with the study of the Cosmic Microwave Background. To meet today astronomers’ needs, we propose hereby an integrated instrument able to perform wide-band spectral measurements in the millimeter spectrum. It is based on the SWIFTS concept (Stationary-Wave Fourier-Transform Spectrometer) an instrument already demonstrated in the optical and infrared bands. Our device "the millimeterSWIFTS" makes use of Kinetic Inductance Detectors (KID) as light detectors. Multiples aspects of the millimeter SWIFTS development are presented in this report. Design of the key-parts of the device is done with the help of electromagnetic simulations. We also propose a process of fabrication allowing the deposition of an antenna on a silicon nitride membrane SiN. First measurements confirm an adapted behavior of the KID in a SWIFTS design and demonstrate a coupling between the antenna and one of the detectors in themillimeter waves. This opens the way to a future demonstrator. In parallel, the technology developed for the millimeter SWIFTS allowed the deposition of KID on membrane. Main goal here is to assess membranes as a mean to reduce the interaction between cosmic rays and the detector in the case of a space application. Comparative measurements performed on KID deposited on membrane and on substrate demonstrate the same rate of events in both cases. Thus, membrane is not an option for the desired application. However, relaxation time shows a dependency with the presence of substrate.
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https://tel.archives-ouvertes.fr/tel-00955804
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Submitted on : Wednesday, March 5, 2014 - 11:59:50 AM
Last modification on : Thursday, November 19, 2020 - 1:01:04 PM
Long-term archiving on: : Thursday, June 5, 2014 - 11:15:38 AM

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  • HAL Id : tel-00955804, version 1

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Citation

Nicolas Boudou. Spectrométrie de Fourier intégrée pour l'astronomie millimétrique. Autre [cond-mat.other]. Université de Grenoble, 2013. Français. ⟨NNT : 2013GRENY050⟩. ⟨tel-00955804⟩

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