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Resolution enhanced photothermal imaging by high-order correlation.

Xiaobing Sunian, Wei Liu, Lei Chen

    Optics Letters
    |October 15, 2020
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    Summary
    This summary is machine-generated.

    High-order correlation imaging enhances laser scanning photothermal imaging resolution. This method overcomes thermal diffusion limits for improved subsurface structure visualization in opaque materials.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Non-Destructive Testing

    Background:

    • Laser scanning photothermal imaging visualizes subsurface structures in opaque materials.
    • Thermal diffusion limits the spatial resolution of photothermal imaging.
    • Conventional methods use focused beams and high repetition rates to improve resolution.

    Purpose of the Study:

    • To enhance the resolution of laser scanning photothermal imaging.
    • To overcome the physical limitations imposed by thermal diffusion.
    • To introduce a novel approach for high-resolution thermal imaging.

    Main Methods:

    • Utilizing high-order correlation imaging inspired by correlated optical imaging.
    • Designing specific laser scanning and modulation behaviors.
    • Controlling statistical properties of laser-induced hotspots.
    • Reconstructing subsurface structures from time-fluctuated thermal images.

    Main Results:

    • Demonstrated enhanced resolution in photothermal imaging.
    • Successfully visualized subsurface structures with improved clarity.
    • Showcased the ability to individually control hotspot statistical properties.
    • Achieved further resolution enhancement using high-order correlation.

    Conclusions:

    • High-order correlation imaging offers a significant advancement in photothermal imaging resolution.
    • This method provides a new pathway for highly resolved thermal imaging.
    • The technique has potential applications in metrology and non-destructive testing.