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Related Experiment Video

Updated: Oct 17, 2025

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Imaging through dynamical scattering media by two-photon absorption detectors.

Wei Liu, Zhihao Zhou, Lei Chen

    Optics Express
    |October 7, 2021
    PubMed
    Summary

    This study demonstrates a new two-photon absorption imaging technique for clear imaging through dynamic scattering media. The method uses femtosecond gating and longer wavelengths for deeper penetration, enabling imaging in challenging conditions like fog and rain.

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    Area of Science:

    • Optics and Photonics
    • Biomedical Imaging
    • Materials Science

    Background:

    • Imaging through dynamic scattering media is severely limited by multiple light scattering.
    • Conventional techniques struggle with the strong scattering of visible light.
    • Ballistic photons offer a path but require highly sensitive, ultrashort time-gated detection.

    Purpose of the Study:

    • To develop a non-invasive coherent imaging scheme for overcoming dynamic scattering.
    • To enable imaging through media equivalent to 28 mean free paths for single photons.
    • To leverage two-photon absorption for enhanced imaging capabilities.

    Main Methods:

    • Experimental demonstration of a novel coherent imaging scheme.
    • Utilizing two-photon absorption in semiconductor photodetectors without phase matching.

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  • Employing a femtosecond time gate for ballistic photon detection.
  • Accessing longer wavelengths for improved penetration depth.

    • Main Results:

    • Successful imaging through dynamic scattering media up to 28 mean free paths.
    • Two-photon absorption detector supported femtosecond gating for distinguishing ballistic photons.
    • The technique allows for deeper light penetration by using longer wavelengths.

    Conclusions:

    • The developed two-photon absorption imaging scheme effectively penetrates dynamic scattering media.
    • This technique shows promise for applications in atmospheric imaging (fog, rain) and biomedical imaging.
    • Combining this method with optical coherence tomography could significantly advance imaging capabilities.