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Towards Printable Natural Dielectric Cloaks via Inverse Scattering Techniques.

Loreto Di Donato¹, Tommaso Isernia^2,3, Giuseppe Labate⁴

¹Department of Electrical, Electronics and Computer Engineering (DIEEI), University of Catania, Viale A. Doria 6, 95126, Catania, Italy. loreto.didonato@dieei.unict.it.

Scientific Reports

|June 18, 2017

Summary

This study explores dielectric cloaks for invisibility. Researchers found specific permittivity conditions for omnidirectional cloaking in the subwavelength regime and optimized natural dielectrics for directional cloaking beyond it.

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Area of Science:

Electromagnetics and Optics
Materials Science
Inverse Problems

Background:

Dielectric cloaks offer potential for manipulating electromagnetic waves.
Understanding the influence of wave properties on cloaking is crucial for practical applications.
Non-magnetic 2D dielectric cloaks are investigated as solutions to inverse scattering problems.

Purpose of the Study:

To synthesize non-magnetic 2D dielectric cloaks.
To analyze the impact of frequency and wave incidence on cloaking mechanisms.
To derive conditions for omnidirectional and directional cloaking.

Main Methods:

Integral formulation of scattering phenomena.
Analytic and numerical approaches.
Optimization techniques for dielectric coating design.

Main Results:

An analytical solution for the quasi-static regime yields a homogeneous artificial dielectric cover (permittivity < ε₀) for omnidirectional cloaking.
Beyond the quasi-static regime, natural dielectric coatings (permittivity > ε₀) are optimized for directional cloaking.
Simulated results validate both analytical and numerical methods, providing effective bandwidth estimations.

Conclusions:

The permittivity of the dielectric cover is a critical factor in achieving cloaking.
Omnidirectional cloaking is achievable in the subwavelength regime with specific artificial dielectrics.
Directional cloaking can be realized using natural dielectrics through optimization, with defined frequency and angular bandwidths.