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Related Experiment Video

Updated: Sep 11, 2025

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
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Photon-magnon coupling using gain-assisted spoof-localized surface plasmons.

Yuzan Xiong, Andrew Christy, Yi Li

    Optics Express
    |August 13, 2025
    PubMed
    Summary
    This summary is machine-generated.

    We enhanced photon-magnon coupling using a novel ring resonator with spoof localized surface plasmons (LSPs). Gain-assisted amplification significantly boosted the quality factor (Q-factor), enabling stronger interactions for hybrid magnonic applications.

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    Area of Science:

    • Quantum optics
    • Condensed matter physics
    • Materials science

    Background:

    • Photon-magnon coupling is crucial for hybrid quantum systems.
    • Planar resonators offer advantages for on-chip integration and mode control.
    • Spoof localized surface plasmons (LSPs) enable unconventional resonator designs.

    Purpose of the Study:

    • To design and fabricate an actively controlled ring resonator supporting LSPs.
    • To investigate gain-assisted photon-magnon coupling with Yttrium Iron Garnet (YIG) magnon modes.
    • To explore the role of resonator Q-factor and external gain in coupling amplification.

    Main Methods:

    • Fabrication of a ring resonator supporting LSPs.
    • Integration with YIG thin films for magnon excitation.
    • Measurement of photon-magnon coupling strength under varying gain conditions.
    • Utilizing a semiconductor amplifier to provide gain and enhance resonator Q-factor.

    Main Results:

    • Demonstrated gain-assisted photon-magnon coupling.
    • Achieved significant amplification of coupling strength.
    • Increased the resonator Q-factor from near-zero to over 1000 for a quadrupole LSP mode.
    • Showcased the effectiveness of gain and loss control in manipulating coupled systems.

    Conclusions:

    • Actively controlled LSP resonators provide a new platform for enhancing photon-magnon coupling.
    • External gain control offers a powerful method for tuning hybrid magnonic systems.
    • This approach has potential for advanced quantum information processing and sensing applications.