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Optical microcavity scanning 3D tomography.

Andrea Di Donato, Luigino Criante, Sara LoTurco

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    This study introduces a novel lens-free 3D tomography technique using a scanning optical microcavity. This method enables noninvasive imaging of microfluidic channels by overcoming diffraction limits for enhanced resolution.

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    Area of Science:

    • Optics and Photonics
    • Microfluidics
    • Biomedical Imaging

    Background:

    • Traditional optical tomography methods often require complex lens systems.
    • Microfluidic devices necessitate high-resolution imaging for analysis and development.
    • Diffraction limits in optical systems restrict the achievable resolution.

    Purpose of the Study:

    • To develop a lens-free 3D tomography technique for microfluidic channels.
    • To utilize a scanning optical microcavity for enhanced imaging capabilities.
    • To overcome the diffraction limit for improved resolution in microfluidic analysis.

    Main Methods:

    • A scanning optical microcavity was constructed using a cleaved fiber positioned near the sample.
    • A low-coherence light source powered the microcavity.
    • Interference of scattered waves within the cavity shaped the transverse field distribution, focusing the beam.
    • The focusing effect extended to inner sample layers, enabling 3D tomography.

    Main Results:

    • Demonstrated lens-free 3D tomography of microfluidic channels.
    • Achieved beam focusing beyond the diffraction limit imposed by the optical fiber's numerical aperture.
    • Preserved focusing effect within inner sample layers for volumetric imaging.
    • Successfully analyzed microfluidic channels using this noninvasive technique.

    Conclusions:

    • The developed scanning optical microcavity technique offers a noninvasive approach for lens-free 3D tomography of microfluidic channels.
    • This method effectively overcomes diffraction limitations, providing enhanced resolution for microfluidic analysis.
    • The technique presents distinct advantages over existing methods like fiber-optic Fourier-domain common-path optical coherence tomography.