Reconfigurable Superdirective and Superabsorptive Aperiodic Metasurfaces
arxiv(2024)
摘要
In this paper, we present a general theory of aperiodic subwavelength arrays
for controlling electromagnetic waves. The considered platform is formed by an
array of electrically small loaded scatterers above a ground plane. While the
array is geometrically periodic, all the loads can be in general different, so
that the distributions of currents induced by plane waves are not periodic. To
allow analytical solutions, we study arrays of thin wires or strips loaded by
bulk loads. We demonstrate a practical way of creating tunable and
reconfigurable multifunctional devices, on examples of superdirective beam
splitters, focusing lenses establishing subdiffraction focusing, and absorbers
going beyond perfect absorption. Contrary to the constraints imposed by the
Floquet theorem in periodic counterparts like periodic metasurfaces or
metagratings, where a fixed angle of incidence and period dictate the
propagating directions of reflected waves, the proposed aperiodic designs allow
controlling all propagating modes in any direction, which provides more freedom
in manipulating electromagnetic waves. We hope that these results can be useful
in multiple applications, such as telecommunications, radar techniques, signal
processing, and energy harnessing.
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