@prefix dcat: <http://www.w3.org/ns/dcat#> .
@prefix dct: <http://purl.org/dc/terms/> .
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@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

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    dct:description """
              In this work, Single Barrier Varactor Diodes and Coplanar Wave-Guides on a membrane were fabricated and characterized in AC regime.<br />The Single Barrier Varactor consists on an heterostructure for a use in harmonic multiplication. This is possible because of the capacitance modulation wich leds to a generation of harmonics. In practice, the heterostructure is a blocking conduction layer of InGaAs/InAlAs/InGaAs or InGaAs/InAlAs/AlAs/InAlAs/InGaAs sample grown by Molecular Beam Epitaxy starting from an InP substrate. Samples exhibit very symetric Capacitance - Voltage characteristics. The best results led to a high capacitance contrast of 5.5 between 0 V and 6 V bias. We also investigted the same heterostructure in a stacked configuration with leakage currents as low as 10 A/cm² at 12 V.<br />Coplanar wave-guides deposited on thin Polyimide or Silicon Nitride dielectric films were studied as passive components. The propagation element can be compared to free space with a low relative dielectric index. Such structure were fabricated using micromachining technology of Gallium Arsenile. We demonstrated a constant high velocity of 2.9.108 m/s close to the velocity of the electromagnetic wave in air. It was also demonsrated that there is a predominance of metallic losses with a square root frequency dependence. Then we showed preliminary results of modelling filters at 250 GHz.<br />The potential applications of this devices are quazi-optical systems at millimeter and submillimeter wavelengths for detection systems.
            """ ;
    dct:identifier "tel-00077055" ;
    dct:issued "2026-05-15T04:09:39.150356"^^xsd:dateTime ;
    dct:language "fr" ;
    dct:modified "2026-05-15T04:09:39.150362"^^xsd:dateTime ;
    dct:publisher <https://rec.harvest-normandie.data4citizen.com/organization/cce9db95-46d9-4dc2-84b6-764215d0a002> ;
    dct:title "Technology of heterostructure devices for satellite detection systems at millimeter wavelengths" ;
    dcat:contactPoint [ a vcard:Organization ;
            vcard:fn "CCSD" ] ;
    dcat:distribution <https://rec.harvest-normandie.data4citizen.com/dataset/oai-hal-tel-00077055v2/resource/f06e08cf-cc01-43e2-912c-41f45f5bfa65> ;
    dcat:keyword "coplanar-waveguides",
        "diodes-varactor",
        "filters",
        "filtres",
        "guide-donde-coplanaire",
        "heterostructure",
        "iii-v-semiconductor",
        "infoeu-reposemanticsdoctoralthesis",
        "lignes-de-transmission",
        "membrane",
        "semiconducteur-iii-v",
        "spimecaengineering-sciences-physicsmechanics-physicsmed-ph",
        "spinanoengineering-sciences-physicsmicro-and-nanotechnologiesmicroelectronics",
        "spiotherengineering-sciences-physicsother",
        "sticothedomainsticdomainsticothe",
        "theses",
        "transmission-lines",
        "varactor-diode" ;
    dcat:landingPage <https://theses.hal.science/tel-00077055> .

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    dct:issued "2026-05-15T04:09:39.254716"^^xsd:dateTime ;
    dct:modified "2026-05-15T04:09:39.103262"^^xsd:dateTime ;
    dct:title "Technology of heterostructure devices for satellite detection systems at millimeter wavelengths" ;
    dcat:accessURL <https://theses.hal.science/tel-00077055> .

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