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Unidirectional coupled chiral fiber grating.

Donghui Wang, Chao Ma, Hongye Wang

    Optics Letters
    |February 15, 2024
    PubMed
    Summary
    This summary is machine-generated.

    We developed a unidirectional coupled chiral fiber grating (UCFG) that allows backward propagation coupling to vortex modes while forbidding forward coupling. This breakthrough enables novel applications in optical devices.

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    Area of Science:

    • Photonics
    • Optical Fiber Technology
    • Chiral Metamaterials

    Background:

    • Chiral fiber gratings typically exhibit reciprocal coupling.
    • Unidirectional coupling is crucial for advanced optical functionalities.

    Purpose of the Study:

    • To investigate a unidirectional coupled chiral fiber grating (UCFG) with helical refractive index (RI) and loss modulation.
    • To demonstrate forbidden forward coupling and backward coupling to vortex modes.

    Main Methods:

    • Utilizing a beam propagation method (BPM) simulation model.
    • Employing coupled mode analysis to understand the non-Hermitian coupling matrix.

    Main Results:

    • Achieved unidirectional coupling by introducing a π/2 phase difference between RI and loss modulations.
    • Forward propagation of the fundamental mode is forbidden.
    • Backward propagation couples the fundamental mode to a vortex mode with a transmittance difference up to 30 dB.

    Conclusions:

    • The UCFG design enables non-reciprocal light propagation.
    • UCFG shows potential as a passive vortex beam generator, filter, and detector.