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    Area of Science:

    • Condensed matter physics
    • Plasmonics
    • Nanophotonics

    Background:

    • Meso-scale structures (tens of plasmon wavelengths) are key for optical energy control.
    • Metal nanostructures enable high-intensity, localized electric fields.
    • Understanding near-field optical properties is crucial for device engineering.

    Purpose of the Study:

    • To investigate the near-field optical properties of mesoscale crystalline gold plates.
    • To explore the influence of morphology and excitation conditions on plasmon behavior.
    • To determine methods for directing optical energy flow and electric field localization.

    Main Methods:

    • Utilized near-field scanning optical microscopy (NSOM).
    • Examined mesoscale crystalline gold plates.
    • Varied plate morphology and excitation conditions.

    Main Results:

    • Observed excitation of surface plasmon polaritons (SPPs) at plate edges.
    • SPPs propagated and interfered as radial waves across the plate surface.
    • Identified nodes of near-field enhancement at specific positions.
    • Demonstrated that near-field enhancement positions can be controlled by plate shape and excitation light polarization.

    Conclusions:

    • Mesoscale plasmonics in gold plates allow for directed optical energy flow.
    • Near-field enhancement can be spatially controlled through structural and excitation parameters.
    • This research offers pathways for designing advanced optical devices and field manipulation strategies.