Jules BILLUART obtain the Doctoral School Prize (Ecole Doctorale "Physique et Sciences de la Matière - ED 352) of Aix Marseille University for his research entitled "Conception of multifonctional planar optics engineered at the sub-wavelength scalee" obtain on October 25, 2021.
His thesis Directors were Michel Lequime and Claude Amra (CONCEPT group at Institut Fresnel) and CIFRE PhD was funding by THALES Research & Technologie (TRT) group.
Abstract :
Optical metasurfaces are sub-wavelength engineered components achieving wavefront shaping in an artificial way. The electromagnetic properties of these surfaces are governed by complex interactions between an incident wavefront and sub-wavelength engineered materials. Such properties enable the design of non-conventional optical functions, paving the way to imaging system miniaturization traditionally based on reflexion, refraction and diffraction mechanisms. This thesis manuscript deals with the integration of opticalmetasurfaces into a hyperspectral embedded imaging system. To achieve it, electromagnetic interactions at the wavelength scalemust be understood in order to design imaging systems characterized by performance criteria such as flux density, Strehl ratio, point spread function or modulation transfert function. Thus, thismanuscript details a design methodology to estimate radiometric properties of a metasurface as well as its point spread function from the local effect of nanostructured materials on an incident wavefront. This methodology is illustrated to design a hyperspectral imaging system, from which a simplified version has been fabricated and characterized considering two wavelengths. To go further, the use of an optimization algorithms is presented, which increases the pic intensity values at both focal points by changing the position and geometrical parameters of a set of nano-elements.
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