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Optically switchable directional invisibility.

Elisa Hurwitz, Greg Gbur

    Optics Letters
    |April 1, 2017
    PubMed
    Summary
    This summary is machine-generated.

    Researchers designed a novel scatterer for directional invisibility using specific plane waves. This "switchable" invisibility has potential applications in optical devices and features unique gain-loss profiles.

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    Area of Science:

    • Physics
    • Optics
    • Metamaterials

    Background:

    • Designing objects with invisibility properties is a key challenge in optics.
    • Previous invisibility cloaks often require specific conditions or are limited in scope.

    Purpose of the Study:

    • To design a scatterer capable of directional invisibility for a specific sum of plane waves.
    • To explore the concept of
    • switchable
    • invisibility based on the presence of all incident plane waves.
    • To investigate the gain-loss profiles of these novel scatterers.

    Main Methods:

    • Theoretical design of a scatterer based on electromagnetic wave theory.
    • Analysis of the scatterer's response to incident plane waves with defined amplitudes and directions.

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  • Characterization of the scatterer's gain-loss properties.

    • Main Results:

    • A scatterer was designed to be directionally invisible under a specific sum of incident plane waves.
    • The invisibility is conditional on the presence of all specified plane waves, enabling "switchable" invisibility.
    • The designed scatterers exhibit balanced gain-loss profiles, offering a more generalized approach than PT-symmetric systems.

    Conclusions:

    • Directional invisibility can be achieved with specifically designed scatterers under controlled plane wave conditions.
    • This work introduces a new paradigm of "switchable" invisibility with potential applications in optical devices.
    • The generalized balanced gain-loss profiles advance the understanding of scattering and cloaking phenomena.