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Résumé
We use a genetic algorithm to optimize periodic arrays of truncated squarebased pyramids made of alternating stacks of metal/dielectric layers. The objective is to achieve broadband quasiperfect absorption of normally incident radiations in the visible and nearinfrared ranges (wavelengths comprised between 420 and 1600 nm). We compare the results one can obtain by considering one, two or three stacks of (i) Ni, Ti, Al or Cu for the metal, and (ii) poly(methyl methacrylate) (PMMA) for the dielectric. The parameters to determine for each metal/dielectric combination are (i) the period of the system, (ii) the lateral dimensions of each
stack of metal/dielectric layers and (iii) the width of each dielectric layer. The Rigorous Coupled Waves Analysis (RCWA) is used to compute the absorptance spectrum of these different structures. The Genetic Algorithm is used to find the geometrical parameters that maximize the integrated absorptance. This approach provides stability maps with respect to the geometrical parameters, which leads to additional physical insight regarding practical implementation. The study shows that Ni/PMMA and Ti/PMMA provide highquality solutions associated with broad optima (stability with respect to variations of the geometrical parameters). On the contrary, Al/PMMA and Cu/PMMA provide poorquality solutions associated with sharp optima. We find an interesting correlation between the robustness of the solutions found by the genetic algorithm (stability with respect to variations of the geometrical parameters) and the stability of these solutions with respect to the number of plane waves used in the RCWA calculations.
stack of metal/dielectric layers and (iii) the width of each dielectric layer. The Rigorous Coupled Waves Analysis (RCWA) is used to compute the absorptance spectrum of these different structures. The Genetic Algorithm is used to find the geometrical parameters that maximize the integrated absorptance. This approach provides stability maps with respect to the geometrical parameters, which leads to additional physical insight regarding practical implementation. The study shows that Ni/PMMA and Ti/PMMA provide highquality solutions associated with broad optima (stability with respect to variations of the geometrical parameters). On the contrary, Al/PMMA and Cu/PMMA provide poorquality solutions associated with sharp optima. We find an interesting correlation between the robustness of the solutions found by the genetic algorithm (stability with respect to variations of the geometrical parameters) and the stability of these solutions with respect to the number of plane waves used in the RCWA calculations.
langue originale  Anglais 

Pages (de  à)  1301714 
Nombre de pages  10 
journal  Proceedings of SPIE  The International Society for Optical Engineering 
Volume  13017 
Les DOIs  
Etat de la publication  Publié  2024 
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CÉCI – Consortium des Équipements de Calcul Intensif
CHAMPAGNE, B. (Responsable du Projet), Lazzaroni, R. (Responsable du Projet), Geuzaine , C. (Coinvestigateur), Chatelain, P. (Coinvestigateur) & Knaepen, B. (Coinvestigateur)
1/01/18 → 31/12/22
Projet: Recherche
Équipement

Plateforme Technologique Calcul Intensif
Champagne, B. (!!Manager)
Plateforme technologique Calcul intensifEquipement/installations: Plateforme technolgique