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Modulation rapide de l’émission infrarouge de métasurfaces incandescentes

Léo Wojszvzyk 1
1 Laboratoire Charles Fabry / Nanophotonique
LCF - Laboratoire Charles Fabry
Abstract : Currently, there is no available source in the mid-infrared range which can be cheap, compact, and whose intensity can be modulated at high frequency. For this purpose, thermal radiation is often considered irrelevant because of the blackbody properties: it is intrinsically broadband, isotropic, unpolarized and the intensity modulation rate is usually limited to a few hertz by thermal inertia.However, there is no fundamental limit that imposes these properties. The goal of this thesis is to design, fabricate and experimentally characterize infrared incandescent sources with a controlled spectrum and polarization and with an intensity that can be modulated faster than 10 megahertz. We present devices which rely on fast temperature modulation of a thin emitter placed on a cold substrate. Indeed, thanks to heat conduction, this emitter can cool down within a characteristic time which varies as the square of its thickness.Firstly, we show a device emitting in MWIR (mid-wave infrared, 3 – 5 microns) based on the Salisbury screen’s principle. We characterize its frequency response up to 10 MHz.Then, we modify this structure and use instead a sub-wavelength metallic grating, thus demonstrating a MWIR source linearly polarized with the same modulation properties.Finally, we propose several devices which can emit circularly polarized infrared radiation and a source operating in LWIR (long-wave infrared, 8 – 12 microns) consisting in a metasurface of hot nano-emitters coupled to cold nano-antennas.
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Léo Wojszvzyk. Modulation rapide de l’émission infrarouge de métasurfaces incandescentes. Optique [physics.optics]. Université Paris Saclay (COmUE), 2019. Français. ⟨NNT : 2019SACLO016⟩. ⟨tel-02461300⟩

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