Theory of metasurface based perfect absorbers

Abstract

Based on an analytic approach, we present a theoretical review on the absorption, scattering, and extinction of both dipole scatterers and regular arrays composed of such scatterers i.e., metasurfaces. Besides offering a tutorial by outlining the maximum absorption limit for electrically/magnetically resonant dipole particles/metasurfaces, we give an educative analytical approach to their analysis. Moreover, we put forward the analysis of two known alternatives in providing perfect absorbers out of electrically and or magnetically resonant metasurfaces; one is based on the simultaneous presence of both electric and magnetic responses in so called Huygens metasurfaces while the other is established upon the presence of a back reflector in so called Salisbury absorbers. Our work is supported by several numerical examples to clarify the discussions in each stage.

References in corpus (2)

• A Perfect Metamaterial Absorber
• Wide-angle infrared absorber based on negative index plasmonic metamaterial

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• Perfect absorption in GaAs metasurfaces by degenerate critical coupling
• Selective Excitation of Subwavelength Atomic Clouds