@prefix dcat: <http://www.w3.org/ns/dcat#> .
@prefix dct: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix vcard: <http://www.w3.org/2006/vcard/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

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    dct:description """
              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.
            """ ;
    dct:identifier "tel-00976996" ;
    dct:issued "2026-05-05T15:25:29.386818"^^xsd:dateTime ;
    dct:language "fr" ;
    dct:modified "2026-05-05T15:25:29.386821"^^xsd:dateTime ;
    dct:publisher <https://rec.harvest-normandie.data4citizen.com/organization/cce9db95-46d9-4dc2-84b6-764215d0a002> ;
    dct:title "Membrane based hot electron bolometers mixers beyond THz for the post-Herschel instrument" ;
    dcat:contactPoint [ a vcard:Organization ;
            vcard:fn "CCSD" ] ;
    dcat:distribution <https://rec.harvest-normandie.data4citizen.com/dataset/oai-hal-tel-00976996v1/resource/f0de6ac9-f1b4-4a1b-9563-b4e226dd1e3f> ;
    dcat:keyword "bolometres-a-electrons-chauds",
        "heterodyne",
        "hot-electron-bolometer",
        "infoeu-reposemanticsdoctoralthesis",
        "melangeur",
        "mixer",
        "physphysphys-ins-detphysics-physicsphysics-physicsinstrumentation-and-detectors-physicsi",
        "quasi-optical",
        "quasi-optique",
        "superconducting",
        "supraconducteur",
        "terahertz",
        "theses" ;
    dcat:landingPage <https://theses.hal.science/tel-00976996> .

<https://rec.harvest-normandie.data4citizen.com/dataset/oai-hal-tel-00976996v1/resource/f0de6ac9-f1b4-4a1b-9563-b4e226dd1e3f> a dcat:Distribution ;
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    dct:issued "2026-05-05T15:25:29.393193"^^xsd:dateTime ;
    dct:modified "2026-05-05T15:25:29.370550"^^xsd:dateTime ;
    dct:title "Membrane based hot electron bolometers mixers beyond THz for the post-Herschel instrument" ;
    dcat:accessURL <https://theses.hal.science/tel-00976996> .

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<https://theses.hal.science/tel-00976996> a foaf:Document .