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Mélangeurs à bolomètres à électrons chauds sur membranes fonctionnant au-delà du THz pour l'instrument post-Herschel

Abstract : We have developed an original concept of a quasi-optical mixer based on a superconducting bolometer for heterodyne detection in the terahertz domain. The detector is a membrane based hot electron bolometer (HEB) and the superconducting material is niobium nitride (NbN) on a dielectric membrane of Si3N4/SiO2, 1.4 microns thick. The membrane is obtained by etching of the silicon substrate. A mirror is used to focus the THz signal and a planar antenna couples the radiation to the HEB. Two mixers blocks have been developed during this thesis: one in the on-axis configuration and another one with an off-axis mirror. Planar antennas spiral and double slot were designed to run on the silicon nitride membrane at frequencies of 0.6 and 1.4 THz. A FTS characterization performed with a double slot antenna at 0.6 THz showed a very good match between the resonance frequency measured and the simulated one. A RF bandwidth of 40% of the center frequency was measured. The first measures of sensitivity with the off-axis mixer block yielded encouraging results with a receiver noise temperature of 1300 K at 0.6 THz. The intermediate frequency bandwidth was measured at 750 MHz. Future works are the increase of the RF frequency beyond the THz, improving the receiver sensitivity and the development of a matrix of HEB. The concept of membrane based HEB could be an interesting solution for THz imaging.
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https://theses.hal.science/tel-00976996
Contributor : Gregory Gay Connect in order to contact the contributor
Submitted on : Thursday, April 10, 2014 - 4:08:38 PM
Last modification on : Wednesday, October 5, 2022 - 11:12:07 AM
Long-term archiving on: : Thursday, July 10, 2014 - 12:50:19 PM

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  • HAL Id : tel-00976996, version 1

Citation

Gregory Gay. Mélangeurs à bolomètres à électrons chauds sur membranes fonctionnant au-delà du THz pour l'instrument post-Herschel. Instrumentations et Détecteurs [physics.ins-det]. Université Pierre et Marie Curie - Paris VI, 2013. Français. ⟨NNT : ⟩. ⟨tel-00976996⟩

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