Conception de micro-optiques par structuration sub-longueur d'onde

Abstract : An optical device modifies the magnitude, the phase or the polarization state of the incident light. My thesis consists in developing optical components in infrared range based on sub-wavelength nanostructures. The possibility to integrate them directly on the top of the array of detectors leads to an improvement of the compactness of the optical device and a better robustness relatively to mechanical stresses. First, I have developed two kinds of devices to control the phase based on phase shifting or diffractive nanoslits that permit for example to conceive planar lenses at the wavelength scale. Besides, I have also demonstra- ted, based on these devices, new optical functions such as the combination of a filtering or a prism function with a lens function. Second, I have conceived, fabricated, and characterized metasurfaces based on array of sub-wavelength plasmonic antennas in order to control spa- tially and spectrally the polarization. In particular, I have realized a wide band and efficient linear polarization converter used in reflection in the infrared range.
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Lévesque Quentin. Conception de micro-optiques par structuration sub-longueur d'onde. Optique [physics.optics]. Ecole Polytechnique, 2014. Français. ⟨tel-01086505⟩

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