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@prefix dct: <http://purl.org/dc/terms/> .
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    dct:description """
              My thesis focused on the study of photons and electrons con nement in several systems. First, I studied a new type of semiconductor nanocrystals to get at room temperature, an e ficient source of single photons polarized. I developed also a technique for two-photon excitation of polaritons in semiconductor microcavities. Our semiconductor nanocrystals have the particularity to have an elongated shell in cadmium sulfi de (CdS) around a spherical core of cadmium selenide (CdSe). During the last decade, semiconductor nanocrystals are known to be effi cient single photons emitters at room temperature. Their photoluminescence present two defects : Blinking, which is the phenomenon of random switching between on and o ff states, and a very low polarization issue. In this work, acting on the geometric parameters of nanocrystals (diameter of the core and length of the shell) I got strongly polarized single photon emission (linear polarization ratio greater than 80%) and showed the link between polarization and the aspect ratio of the nanocrystals. In addition, nely adjusting the thickness of the shell, I have demonstrated the possibility to reduce strongly blinking, while retaining a single photon source with high quality (g(2) < 0:2). In the second part of my thesis, I am interested in strong light-matter coupling in semiconductor microcavities and micropillars. I have developed and characterized a new type of excitation of polaritons based on two-photon absorption. In the case of micropillars where polaritons are confi ned to a 0D system, we have demonstrated photon lasing with two-photon pumping. Relaxation and interactions between polaritons are also compared under di fferent excitation.
            """ ;
    dct:identifier "tel-00818662" ;
    dct:issued "2026-05-11T07:03:37.907063"^^xsd:dateTime ;
    dct:language "fr" ;
    dct:modified "2026-05-11T07:03:37.907068"^^xsd:dateTime ;
    dct:publisher <https://rec.harvest-normandie.data4citizen.com/organization/cce9db95-46d9-4dc2-84b6-764215d0a002> ;
    dct:title "Study of semiconductors nanoemitters for quantum photonics: Microcavity polariton under two-photon excitation and single photon emission with colloidal nanocrystals." ;
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            vcard:fn "CCSD" ] ;
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    dcat:keyword "absorption-a-deux-photons",
        "auger-recombination",
        "bi-exciton",
        "blinking",
        "boite-quantique",
        "clignotement",
        "couplage-fort-lumiere-matiere",
        "cryogenic-temperature",
        "cryogenie",
        "effet-laser",
        "individual-nanocrystals",
        "infoeu-reposemanticsdoctoralthesis",
        "laser",
        "microcavite-planaire",
        "micropiliers",
        "micropillars",
        "nanocristaux-individuels",
        "nanocristaux-semiconducteurs",
        "physqphyphysics-physicsquantum-physics-quant-ph",
        "planar-microcavities",
        "polariton",
        "quantum-dots",
        "recombinaison-auger",
        "semiconductors-nanocrystals",
        "strong-light-mater-coupling",
        "theses",
        "trion",
        "two-photon-absorption" ;
    dcat:landingPage <https://theses.hal.science/tel-00818662> .

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    dct:issued "2026-05-11T07:03:37.941790"^^xsd:dateTime ;
    dct:modified "2026-05-11T07:03:37.863662"^^xsd:dateTime ;
    dct:title "Study of semiconductors nanoemitters for quantum photonics: Microcavity polariton under two-photon excitation and single photon emission with colloidal nanocrystals." ;
    dcat:accessURL <https://theses.hal.science/tel-00818662> .

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