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    Researchers developed electrically controllable chiral photonic resonators using oxide multiferroic layers. These devices can trap and filter chiral light, with an electric field tuning the light

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    Area of Science:

    • Photonics and Materials Science
    • Chirality in Condensed Matter Physics

    Background:

    • Externally tunable chiral photonic sources and resonators are crucial for chiral matter research.
    • Oxide-based stacks of helical multiferroic layers offer a promising medium for controlling chiral photonic fields.

    Purpose of the Study:

    • To demonstrate oxide-based multiferroic heterostructures as electrically controllable chiral photonic resonators.
    • To investigate the trapping and filtering of chiral photonic fields within these structures.

    Main Methods:

    • Utilized analytical and rigorous coupled wave numerical methods to simulate electromagnetic wave behavior.
    • Analyzed dispersion and scattering characteristics in multiferroic heterostructures.

    Main Results:

    • Identified that spin helix texture scattering confines specific transverse wavenumber modes as standing chiral waves.
    • Observed that other modes are leaked out of the resonator.
    • Demonstrated nonvolatile, energy-efficient control of photonic chirality density via an external static electric field.

    Conclusions:

    • Oxide multiferroic heterostructures can function as tunable chiral photonic resonators.
    • Electrical control over spin chirality provides a method for tuning photonic chirality density.