The paper, titled "Virtual hyperbolic metamaterials for manipulating radar signals in air," is co-authored by Zhaxylyk A. Kudyshev, Martin C. Richardson and Natalia M. Litchinitser.
This work introduces virtual hyperbolic metamaterials (VHMMs)
formed by an array of plasma channels in air as a result of
self-focusing of an intense laser pulse, and shows that such
structure can be used to manipulate microwave beams in air.
Hyperbolic, or indefinite, metamaterials are photonic structures
that possess permittivity and/or permeability tensor elements of
opposite sign with respect to one another along principal axes,
resulting in a strong anisotropy. The authors' proof-of-concept
results confirm that the proposed virtual hyperbolic metamaterial
structure can be used for efficient beam collimation and for
guiding radar signals around obstacles, opening a new paradigm for
electromagnetic wave manipulation in air.
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