Multilayer metamaterial absorbers inspired by perfectly matched layers

Abstract

We derive periodic multilayer absorbers with effective uniaxial properties similar to perfectly matched layers (PML). This approximate representation of PML is based on the effective medium theory and we call it an effective medium PML (EM-PML). We compare the spatial reflection spectrum of the layered absorbers to that of a PML material and demonstrate that after neglecting gain and magnetic properties, the absorber remains functional. This opens a route to create electromagnetic absorbers for real and not only numerical applications and 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 cylindrical core-shell nanostructures derived from flat multilayers also exhibit very good absorptive and reflective properties despite the different geometry

A comparative study between different approaches to improve the RCS of a compact double-layer absorber

“…In recent years, an excessive devotion has been considered to radar absorbing materials (RAM) that exhibit excellent absorption properties in the microwave frequency band due to upward evolution of wireless system technologies, electromagnetic compatibility (EMC), radomes antennas, thermal emitters, and radar systems [1,2]. The usage of different RAM types is due to their capability of achieving electromagnetic wave filtration, electromagnetic interference reduction and radar cross section reduction (RCSR) as well [3].…”