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Finite frequency external cloaking with complementary bianisotropic media.

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    Area of Science:

    • Electromagnetism
    • Metamaterials
    • Computational Physics

    Background:

    • Investigating the electromagnetic properties of advanced materials like bianisotropic media.
    • Understanding wave scattering phenomena is crucial for applications in stealth and sensing.
    • The development of novel cloaking techniques relies on manipulating electromagnetic fields.

    Purpose of the Study:

    • To explore the dual functionality of cylindrical shells made from negatively refracting heterogeneous bianisotropic (NRHB) materials.
    • To analyze how these shells affect the scattering of electromagnetic waves from embedded or nearby objects.
    • To demonstrate cloaking capabilities using space cancellation and simplified material parameters.

    Main Methods:

    • Derivation of material properties using geometric transforms.
    • Numerical simulations to analyze scattering enhancement and reduction.
    • Application of space cancellation principles for cloaking scenarios.
    • Investigation in the quasi-static limit for specific configurations.

    Main Results:

    • NRHB shells enhance scattering from perfect electric conducting (PEC) cores via a homeopathic effect.
    • NRHB shells significantly reduce scattering from bianisotropic cores through space cancellation (external cloaking).
    • Finite frequency cloaking is achieved using NRHB cylindrical lenses and slabs with complementary properties.
    • An 'ostrich effect' is observed, where scattering from NRHB structures hides small electric antennas in the quasi-static limit.

    Conclusions:

    • NRHB cylindrical shells exhibit versatile functionalities in controlling electromagnetic scattering.
    • Space cancellation is a key mechanism for achieving external cloaking with bianisotropic media.
    • The findings offer new pathways for designing advanced cloaking devices and electromagnetic shields.