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Angular-domain scattering interferometry.

Dustin W Shipp, Ruobing Qian, Andrew J Berger

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    This study introduces a novel optical method for precisely measuring the average size of microscopic particles using angular scattering and interferometry. The technique enhances accuracy in small sample areas by modeling interference and Mie scattering effects.

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    Area of Science:

    • Optical Physics
    • Materials Science
    • Nanotechnology

    Background:

    • Accurate size characterization of microscopic scatterers is crucial in various scientific fields.
    • Traditional intensity-based methods struggle with small illumination areas due to large speckle grains.
    • Existing techniques lack the resolution needed for precise size estimation in confined spaces.

    Purpose of the Study:

    • To develop an angular-scattering optical method for measuring mean scatterer size in static ensembles within a small field of view (< 20 μm).
    • To overcome limitations of intensity-based models in small-area measurements by incorporating interferometry.
    • To improve the sensitivity and robustness of scatterer size estimation.

    Main Methods:

    • Utilized an angular-scattering optical method combined with interferometry.
    • Estimated scatterer locations to model both between-scatterer interference and single-particle Mie scattering.
    • Employed direct angular-domain measurements for enhanced angular resolution compared to image-plane recordings.

    Main Results:

    • Successfully measured the mean size of scatterers in static ensembles within a sub-20-μm field of view.
    • Demonstrated increased sensitivity to size-dependent scattering features, leading to more robust size estimates.
    • Showcased the method's effectiveness using various sizes of polystyrene beads.
    • Recovered the full complex scattered field, revealing a size-dependent phase profile.

    Conclusions:

    • The developed interferometric angular-scattering method accurately measures mean scatterer size in small sample areas.
    • This technique offers superior angular resolution and sensitivity compared to existing methods.
    • The ability to recover the complex scattered field provides deeper insights into particle characteristics.