Revealing radiationless sources with multi-harmonic mantle cloaking

A general formula for the scattering suppression of simultaneous cylindrical harmonic waves is reported for a bare dielectric cylinder. A proper surface impedance condition is imposed at the boundary between dielectric and background regions, revealing a parity-time condition for the internal electr...

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Bibliographic Details
Published in:Journal of optics (2010) 2020-06, Vol.22 (6), p.65401
Main Authors: Labate, Giuseppe, Massaccesi, Andrea, Pavone, Santi C
Format: Article
Language:English
Subjects:
cloaking
electromagnetic scattering
impedance metasurfaces
radiationless sources
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Summary:A general formula for the scattering suppression of simultaneous cylindrical harmonic waves is reported for a bare dielectric cylinder. A proper surface impedance condition is imposed at the boundary between dielectric and background regions, revealing a parity-time condition for the internal electromagnetic field in order to be nonradiating. Depending on the maximum number Mmax of cylindrical harmonic waves to suppress along the azimuthal variable , such surface impedance function profile reveals several higher order nonradiating modes. The determination of Mmax is consistent with the degrees of freedom of the scattered fields. Moreover, the multi-harmonic mantle cloaking technique automatically generates radiationless sources suitable for the implementation with metal-dielectric metasurfaces or all-dielectric metamolecules.
ISSN:2040-8978
2040-8986
DOI:10.1088/2040-8986/ab8071