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Silicon nanocrystals as light sources: optical analysis and realisation of microcavities

Abstract : This work concerns the implementation and analysis of optical properties of silicon nanocrystals. These nanoscaled objects have remarkable optical properties, especially in photoluminescence. The properties of quantum confinement that characterize them allow obtaining an intense luminescence signal in the visible range. Optoelectronic and photonic devices have been proposed based on silicon nanocrystals. The physical reasons of the strong luminescence signal, however, are still poorly understood. The silicon nanocrystals are prepared by evaporation. The preparation and thermal annealing of multilayers SiO/SiO2 leads to silicon nanocrystals with a well controlled average diameter. They are created during the demixing of the SiO layer by the reaction SiO ? Si + SiO2. The control the diameter of the silicon nanocrystals influences directly the spectral region of luminescence in the visible region. The aim of first part of this work is to isolate one or a few silicon nanocrystals. The intent is to trace the homogeneous width of these nano-objects. Initially, a study focusing on the SiOx material is conducted to reduce the surface density of silicon nanocrystals. In a second step, lithography is implemented to make masks with holes with diameters of about one hundred nanometers. Optical spectroscopy experiments were performed on these systems. The second part of this work aims controlling the spontaneous emission of light from silicon nanocrystals. This is done by coupling the electronic transmission to optical modes confined in an optical microcavity. The manuscript describes the methods developed to obtain an optical microcavity whose optical modes can be coupled effectively to the silicon nanocrystals. The optical properties of these systems are finally analyzed
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  • HAL Id : tel-01746346, version 1

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Mathias Grün. Silicon nanocrystals as light sources: optical analysis and realisation of microcavities. Other [cond-mat.other]. Université Henri Poincaré - Nancy 1, 2010. English. ⟨NNT : 2010NAN10108⟩. ⟨tel-01746346⟩

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