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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Multimode interference in topological photonic heterostructure.

Lei Liu, Yueke Wang, Feixiang Zheng

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    Topological photonic heterostructures enable novel integrated circuits. Coupled topological edge states demonstrate topologically protected multimode interference for device applications.

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    Area of Science:

    • Photonics
    • Condensed Matter Physics
    • Materials Science

    Background:

    • Topological photonic heterostructures offer unique properties for light manipulation.
    • Coupled topological edge states (CTESs) arise from the interaction of distinct topological phases in finite photonic crystals.

    Purpose of the Study:

    • To propose and investigate topological photonic heterostructures.
    • To explore the multimode interference (MMI) effect of CTESs.
    • To demonstrate the topological protection and applications of CTESs in photonic integrated circuits.

    Main Methods:

    • Finite element method (FEM) for predicting and analyzing MMI effects.
    • Numerical simulations to investigate paired and symmetrical interferences.
    • Design and demonstration of frequency and power splitters based on MMI.

    Main Results:

    • CTESs were identified and their MMI effects were predicted and analyzed.
    • Paired and symmetrical interference patterns and imaging positions were calculated.
    • The MMI effect was shown to be topologically protected against disorder.
    • Novel frequency and power splitters utilizing CTESs were numerically demonstrated.

    Conclusions:

    • Topological photonic heterostructures provide a new platform for integrated photonic devices.
    • CTESs and their MMI effects offer robust functionalities for photonic circuits.
    • This work presents a new approach for designing topological photonic integrated circuits, including filters, couplers, and multiplexers.