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Title: Reduction of scattering using thin all-dielectric shells designed by stochastic optimizer

Adaptive differential evolution method has been used for optimization of all-dielectric multilayer coatings in order to reduce total scattering from spherical targets. The optimal refractive index profiles have been found for various sizes of targets and thicknesses of coatings. Few profile types that appear to be optimal for various geometrical parameters have been identified. Scattering of the target with diameter of 0.75 λ has been reduced by 85% using 0.16 λ thick coating formed by isotropic dielectric materials. For larger targets, scattering reduction becomes smaller, but it still reaches 50% for targets with the diameter of 1.5 λ. The obtained designs provide a route to implement cloaking without the use of magnetic and anisotropic metamaterials.
Authors:
 [1] ;  [2] ;  [3] ; ; ;  [1]
  1. ITMO University, 49 Kronverskii Ave., St. Petersburg 197101 (Russian Federation)
  2. (Russian Federation)
  3. Instituto de Fusión Nuclear, Universidad Politécnica de Madrid, José Gutiérrez Abascal 2, E-28006 Madrid (Spain)
Publication Date:
OSTI Identifier:
22402641
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 18; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANISOTROPY; COATINGS; DESIGN; DIELECTRIC MATERIALS; LAYERS; OPTIMIZATION; REFRACTIVE INDEX; SCATTERING; SHELLS; SPHERICAL CONFIGURATION; STOCHASTIC PROCESSES; THICKNESS