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Related Experiment Video

Updated: Apr 2, 2026

Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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Boundary-driven exceptional points in photonic waveguide lattices.

Stefano Longhi

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    |April 1, 2026
    PubMed
    Summary

    Boundary-driven exceptional points in photonic lattices are predicted. These points arise from reflections and induce memory effects, offering a platform for exploring non-Hermitian physics.

    Area of Science:

    • Photonics
    • Non-Hermitian Physics
    • Waveguide Lattices

    Background:

    • Exceptional points (EPs) are fundamental in non-Hermitian systems.
    • Boundary effects in finite photonic lattices are well-studied.
    • Understanding memory effects in photonic systems is crucial for advanced applications.

    Purpose of the Study:

    • To predict and analyze boundary-driven exceptional points in semi-infinite Hermitian photonic waveguide lattices.
    • To investigate the role of lattice termination and coherent reflections in EP formation.
    • To explore the dynamics of a side-coupled defect influenced by lattice boundary effects.

    Main Methods:

    • Exact analytic approach to derive the defect's non-Markovian memory kernel.
    • Analysis of resonance trajectories and coalescence conditions.

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  • Numerical simulations of Hermitian photonic waveguide lattices.

    • Main Results:

    • Identified boundary-driven exceptional points arising from coherent reflections at the lattice termination.
    • Derived a non-Markovian memory kernel characterizing the defect dynamics.
    • Demonstrated precise tunability of resonance coalescence by defect position and coupling strength.

    Conclusions:

    • Boundary effects in Hermitian lattices can induce phenomena typically associated with non-Hermitian systems.
    • The derived memory kernel provides insights into memory-enabled non-Hermitian physics.
    • The proposed system offers an experimentally accessible platform for exploring these phenomena.