Absorption à deux photons pour la détection infrarouge : Une alternative aux schémas classiques de détection quantique

Abstract : This work was focused on the investigation of non-degenerate two-photon absorption (ND-2PA) as a solution for detecting infrared photons in visible bandgap materials. This allows high performance operation at high temperatures. Firstly, we investigated the different descriptions of two-photon absorption and applied them in the theoretical frame of photodetection. We have then characterised several commercial photodetectors, thus highlighting the competition between linear and non-linear processes of sub-bandgap photon absorption, as well as the need to compensate the intrinsic inefficiency of two-photon absorption by using non-conventional photodetectors. Secondly, we designed uncooled photodetectors based on two-photon absorption inside a semiconductor embedded in a resonnant metallic nanostructure. Due to strong field enhancement, non-linear processes are increased by several orders of magnitude. These performances were both proven numerically and experimentally, after fabrication of sample devices in a clean room environment, and characterisation of their optoelectronics properties. This work is a first step toward an innovative method for infrared photodetection at high operating temperatures.
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Benjamin Vest. Absorption à deux photons pour la détection infrarouge : Une alternative aux schémas classiques de détection quantique. Optique [physics.optics]. Ecole Polytechnique, 2015. Français. ⟨tel-01262307⟩

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