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We derive periodic multilayer absorbers with effective uniaxial propertiessimilar to perfectly matched layers (PML). This approximate representation ofPML is based on the effective medium theory and we call it an effective mediumPML (EM-PML). We compare the spatial reflection spectrum of the layeredabsorbers to that of a PML material and demonstrate that after neglecting gainand magnetic properties, the absorber remains functional. This opens a route tocreate electromagnetic absorbers for real and not only numerical applicationsand as an example we introduce a layered absorber for the wavelength of$8$~$\mu$m made of SiO$_2$ and NaCl. We also show that similar cylindricalcore-shell nanostructures derived from flat multilayers also exhibit very goodabsorptive and reflective properties despite the different geometry.

Multilayer metamaterial absorbers inspired by perfectly matched layers