Broadband layered absorbers are analysed theoretically and experimentally. A genetic algorithm is used to opti- mize broadband and wide-angle of incidence metal-dielectric layered absorbers. An approximate representation of the perfectly matched layer with a spatially varied absorption strength is discussed. The PML is realised as a stack of uniform and isotropic metamaterial layers with permittivieties and permeabilities given from the effective medium theory. This approximate representation of PML is based on the effective medium theory and we call it an effective medium PML (EM-PML).1 We compare the re ection properties of the layered absorbers to that of a PML material and demonstrate that after neglecting gain and magnetic properties, the absorber remains functional.

Date Published: 6 May 2015
PDF: 7 pages
Proc. SPIE 9502, Metamaterials X, 95020F (6 May 2015); doi: 10.1117/12.2181875

Published in SPIE Proceedings Vol. 9502:
Metamaterials X
Vladimír Kuzmiak; Peter Markos; Tomasz Szoplik, Editor(s)