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Master Thesis

Élaboration de nouveaux traitements optiques hautes performances grâce à l'utilisation de la croissance en incidence rasante

Abstract : The purpose of this study is the production of a high peformance antireflective coating. This study has been done with the company Sagem in partnership with the Institut Pprime. Both a theoretical approach and an industrial approach will be made. Conventional antireflective coatings are made by deposition of thin film at the surface of a substrate. This treatment can be carried out in a monolayer or multilayer. The performance of the single-layer treatment and thin film interference made by multiple-layers are poorer than the performances of the gradient index method. However the production of such coating is limited due to the absence of materials with refractive index close to the refractive index of air. However, it’s possible by nanostructuring materials to introduce porosity within them and lowering at the same time the index of these materials. This can be achieved by the method of glancing angle deposition (GLAD), which allows us to control the index through the control of the angle of deposition by PVD. In this study we therefore used PVD by evaporation for carrying out the GLAD deposition technique. We analyzed our samples by ellipsometry and photometry which allowed us with the SCOUT modeling software to simulate the values of thicknesses, refractive indexes and absorptions of our samples. Macleod software was used to make the design of an optical treatment based on the use of two oxides SiO2 and Ti203, the selected materials to perform the optical coatings of this study. In order to produce an antireflective prototype we have in a first step carried out a study to characterize the deposited oxide monolayer and the influence of various parameters on the values of porosity and absorption. The parameters giving the best results, minimal absorption and wide range of porosity, were selected to realize a two-layer antireflection coating. The produced bilayer’s performances show the interest of the method employed, because the transmission performances obtained this way are superior to conventional multilayer treatment.
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Master Thesis
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Submitted on : Friday, November 13, 2015 - 4:36:16 PM
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  • HAL Id : dumas-01228745, version 1

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Florian Maudet. Élaboration de nouveaux traitements optiques hautes performances grâce à l'utilisation de la croissance en incidence rasante. Physique [physics]. 2015. ⟨dumas-01228745⟩

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