6533b7d2fe1ef96bd125dd54

RESEARCH PRODUCT

ETUDE ET RÉALISATION D'UN DETECTEUR (FILTRE) MULTISPECTRAL PAR DISPERSION NON DESTRUCTIVE SPECTRALE A TRAVERS DES FILMES A NONSTRUCTURE

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The development of multispectral imaging, holography and lithography techniques exploits the properties of diffracting arrays in a wide variety of photonic components. They are incorporated in laser diodes as distributed Bragg reflectors, in various integrated optical functions for wavelength division multiplexing or optical interconnections, or inscribed within the fibers themselves, leading to a wide variety of sensors for detection of chemical elements, measurement of temperatures, pressures, accelerations of acquisition and or restitution of multispectral images, etc. [Lee et al. 2007] [Pagnoux et al. 2005].Among these devices, the resonant networks arouse a great interest because they allow to obtain ultra-selective filters from a relatively simple structure. This structure consists of a dielectric guide on which is etched a subwavelength network of shallow depth and thickness. Except resonance, the structure reflects and transmits the light according to the properties of reflectivity and transmission very close to those of the diopter constituted by the stack of dielectric layers.This work presents the experimental and theoretical studies carried out to overcome the technological obstacles inherent to the realization of thin-film multispectal optical filters.The aim of this thesis is to study and design ultra-selective optical filters based on nanoscale thin films, by exploiting a resonant network structure conceived by depositing multilayer nanowires of metamaterials to surpass the performances of the current filters. Particular in the field of their spectral characteristics and their sensitivity to polarization. An issue of the study is to develop the associated manufacturing process, to identify the technological limitations imposed by the state of the art, to propose a reproducible process and if possible compatible with a collective technological development and low cost.The second was to use the samples from the fabrication of the diffraction gratings to associate it with a tri-CCD transistor-based sensor in the LE2I laboratory, in order to design a sharp acquisition device in multispectral imaging and of vision.The analysis of experimental performances, confronted with theoretical predictions and technological limitations, must lead to a realistic estimate of the potentialities of the proposed filters. To do this we began our study with a literature review on all the key elements of the subject, Nanotechnology, nanoscience these advantages these disadvantages, these possibilities. A review of the literature on multispectral imaging and these ascendants.