Interference theory of metamaterial perfect absorbers

Details Interference theory of metamaterial perfect absorbers Interference theory of metamaterial perfect absorbers

2011-12-21

arxiv.org/abs/1112.5168v1

Physics

Optics

8 pages, 4 figures, submitted to Optics Express

Scientific paper

The impedance matching in metamaterial perfect absorbers has been believed to involve and rely on magnetic resonant response, with a direct evidence from the anti-parallel directions of surface currents in the metal structures. Here we present a different theoretical interpretation based on interferences, which shows that the two layers of metal structure in metamaterial absorbers are linked only by multiple reflections with negligible near-field interactions or magnetic resonances. This is further supported by the out-of-phase surface currents derived at the interfaces of resonator array and ground plane through multiple reflections and superpositions. The theory developed here explains all features observed in narrowband metamaterial absorbers and therefore provides a profound understanding of the underlying physics.

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