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    Researchers precisely identified resonant modes in coupled photonic resonators using near-field measurements and coupled-mode theory. Microwave experiments confirmed an effective model for photonic coupling, emphasizing quadrupole terms in specific configurations.

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    Area of Science:

    • Photonics and optical physics
    • Resonant systems analysis
    • Electromagnetics

    Background:

    • Understanding resonant modes in coupled photonic systems is crucial for designing advanced optical devices.
    • Existing models for photonic coupling require experimental validation across diverse configurations.

    Purpose of the Study:

    • To unambiguously identify all resonant modes in coupled photonic resonator systems.
    • To experimentally investigate the influence of configurational parameters on inter-resonator coupling.
    • To validate effective models of photonic coupling and identify key contributing factors.

    Main Methods:

    • Integration of near-field measurement techniques with coupled-mode-theory (CMT) analysis.
    • Conducting extensive microwave experiments on coupled photonic resonator systems.
    • Systematic variation of configurational parameters to study coupling dynamics.

    Main Results:

    • Unambiguous identification of all resonant modes in the studied coupled systems.
    • Quantitative verification of a previously established effective model for photonic coupling.
    • Demonstration of the significant role of quadrupole terms in specific coupling scenarios.

    Conclusions:

    • The combined approach of near-field measurements and CMT provides a robust method for analyzing coupled photonic systems.
    • Experimental results validate theoretical models, enhancing their predictive power for photonic coupling.
    • The study underscores the necessity of considering higher-order terms, like quadrupole terms, for accurate modeling in certain photonic coupling regimes.