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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Ultrafast Spectroscopy

    Background:

    • Ultrafast transient processes require advanced imaging techniques.
    • Spatiotemporal resolution is crucial for characterizing dynamic phenomena.
    • Current methods may lack flexibility in targeting specific regions within 3D specimens.

    Purpose of the Study:

    • To develop a spatially resolved pump-probe microscope with random-access scanning capabilities.
    • To enable measurements of ultrafast transient processes in arbitrarily selected 3D regions.
    • To demonstrate the system's performance in characterizing ultrafast phenomena.

    Main Methods:

    • Utilized a digital micromirror device (DMD) for wavefront modulation via binary holography.
    • Implemented random-access scanning by rapidly switching holograms stored in the DMD.
    • Achieved a field of view of 65×130×155 μm³ and a scanning speed of 8 kHz.

    Main Results:

    • Successfully measured ultrafast transient reflectivity of 2D gold patterns on silicon and silicon nitride.
    • Demonstrated excellent signal-to-noise ratio and high spatial-temporal resolution.
    • Validated the 3D random scanning capability for versatile measurements.

    Conclusions:

    • The developed pump-probe microscope is a versatile instrument for characterizing ultrafast 3D phenomena.
    • The system offers high spatial and temporal resolution for advanced scientific investigations.
    • Potential applications include studying phenomena like localized surface plasmon resonance propagation.