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Experimental Investigation of Size Effects on Surface Phonon Polaritons and Phonon Transport

Abstract : Thermal conduction becomes less efficient as structures scale down into submicron sizes since phonon-boundary scattering becomes predominant and impede phonons more efficiently than Umklapp scattering. Recent studies indicated that the surface phonon polaritons (SPhPs), which are the evanescent electromagnetic waves generated by the hybridation of the optical phonons and the photons and propagating at the surface of a polar dielectric material surface, potentially serve as novel heat carriers to enhance the thermal performance in micro- and nanoscale devices. We study the condition of SPhPs existing in a dielectric submicron film with a broad frequency range. The calculaton of SPhPs thermal conductivity based on Boltzmann transport equation (BTE) demonstrates that the heat flux carried by SPhPs exceeds the one carried by phonons. We also conduct a time-domain-thermal-reflectance (TDTR) measurement of SiN submicron films and demonstrate that the thermal conductivity due to the SPhPs at high temperatures increases by decreasing the film thickness. The results presented in this thesis have potential applications in the field of heat transfer, thermal management, near-field radiation and polaritonics.
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Submitted on : Tuesday, May 21, 2019 - 10:41:13 AM
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Yunhui Wu. Experimental Investigation of Size Effects on Surface Phonon Polaritons and Phonon Transport. Thermics [physics.class-ph]. Université Paris Saclay (COmUE), 2019. English. ⟨NNT : 2019SACLC012⟩. ⟨tel-02135264⟩

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