Closed-form harmonic contrast control with surface impedance coatings for conductive objects

Giuseppe Labate; Symon K. Podilchak; Ladislau Matekovits

doi:10.1364/AO.56.010055

Closed-form harmonic contrast control with surface impedance coatings for conductive objects

Giuseppe Labate^*, Symon K. Podilchak, Ladislau Matekovits

^*Corresponding author for this work

School of Engineering

Research output: Contribution to journal › Article › peer-review

16 Citations (Scopus)

Abstract

The problem of suppressing the scattering from conductive objects is addressed in terms of harmonic contrast reduction. A unique compact closed-form solution for a surface impedance Z_s(m, kr) is found in a straightforward manner and without any approximation as a function of the harmonic index m (scattering mode to suppress) and of the frequency regime kr (product of wavenumber k and radius r of the cloaked system) at any frequency regime. In the quasi-static limit, mantle cloaking is obtained as a particular case for kr ≪ 1 and m = 0. In addition, beyond the quasi-static regime, impedance coatings for a selected dominant harmonic wave can be designed with proper dispersive behavior, resulting in improved reduction levels and harmonic filtering capability.

Original language	English
Pages (from-to)	10055-10059
Number of pages	5
Journal	Applied Optics
Volume	56
Issue number	36
DOIs	https://doi.org/10.1364/AO.56.010055
Publication status	Published - 20 Dec 2017

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abstract = "The problem of suppressing the scattering from conductive objects is addressed in terms of harmonic contrast reduction. A unique compact closed-form solution for a surface impedance Zs(m, kr) is found in a straightforward manner and without any approximation as a function of the harmonic index m (scattering mode to suppress) and of the frequency regime kr (product of wavenumber k and radius r of the cloaked system) at any frequency regime. In the quasi-static limit, mantle cloaking is obtained as a particular case for kr ≪ 1 and m = 0. In addition, beyond the quasi-static regime, impedance coatings for a selected dominant harmonic wave can be designed with proper dispersive behavior, resulting in improved reduction levels and harmonic filtering capability.",

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AU - Podilchak, Symon K.

AU - Matekovits, Ladislau

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AB - The problem of suppressing the scattering from conductive objects is addressed in terms of harmonic contrast reduction. A unique compact closed-form solution for a surface impedance Zs(m, kr) is found in a straightforward manner and without any approximation as a function of the harmonic index m (scattering mode to suppress) and of the frequency regime kr (product of wavenumber k and radius r of the cloaked system) at any frequency regime. In the quasi-static limit, mantle cloaking is obtained as a particular case for kr ≪ 1 and m = 0. In addition, beyond the quasi-static regime, impedance coatings for a selected dominant harmonic wave can be designed with proper dispersive behavior, resulting in improved reduction levels and harmonic filtering capability.

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Closed-form harmonic contrast control with surface impedance coatings for conductive objects

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