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Related Experiment Video

Updated: Nov 30, 2025

Three-dimensional Optical-resolution Photoacoustic Microscopy
08:31

Three-dimensional Optical-resolution Photoacoustic Microscopy

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High-resolution microscopy through optically opaque media using ultrafast photoacoustics.

Alessandro Antoncecchi, Hao Zhang, Stephen Edward

    Optics Express
    |November 13, 2020
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel high-resolution microscope using laser ultrasonics to image structures through opaque materials. It achieves micrometer resolution and nanometer depth sensitivity, enabling visualization of buried microstructures.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Acoustics

    Background:

    • Imaging buried structures through optically opaque materials is challenging.
    • Traditional microscopy is limited by material opacity.
    • Need for non-destructive imaging techniques for microstructures.

    Purpose of the Study:

    • To develop a high-resolution microscope for imaging through opaque layers.
    • To achieve micrometer transverse resolution and nanometer depth sensitivity.
    • To demonstrate imaging of microstructured objects through metal layers.

    Main Methods:

    • Utilizing laser ultrasonic techniques with ultrafast laser pulses to generate acoustic waves.
    • Optically detecting acoustic echoes from buried interfaces using a time-delayed probe pulse.
    • Developing signal analysis for high-frequency ultrasound imaging.

    Main Results:

    • Demonstrated imaging of complex microstructured objects through 200 nm metal layers.
    • Successfully imaged gratings through 500 nm thick metal layers.
    • Achieved a diffraction-limited transverse resolution of 1.2 μm and depth sensitivity better than 10 nm.

    Conclusions:

    • The developed laser ultrasonic microscope can image buried structures through optically opaque materials.
    • High-frequency ultrasound enables resolution limited by the optical detection system.
    • This technique offers a powerful tool for non-destructive subsurface imaging at the microscale.