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Using holography to measure extinction.

Matthew J Berg, Nava R Subedi, Peter A Anderson

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    Summary
    This summary is machine-generated.

    This study introduces a novel method to measure a single particle's extinction cross section in situ using holography. The technique accurately determines particle size and shape alongside extinction, minimizing measurement errors.

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    Area of Science:

    • Optics and Photonics
    • Particle Characterization
    • Light Scattering

    Background:

    • Accurate measurement of extinction cross section is crucial for understanding particle interactions with light.
    • In situ measurements of single particles present unique challenges in optical characterization.

    Purpose of the Study:

    • To present a new concept for measuring the extinction cross section of a single particle in situ.
    • To demonstrate the simultaneous determination of particle shape, size, and extinction cross section.

    Main Methods:

    • Recording holograms from the interference of forward-scattered light and incident light.
    • Integrating the measured interference pattern to approximate the extinction cross section.
    • Utilizing Fresnel-Kirchhoff diffraction theory for computational image reconstruction from holograms.

    Main Results:

    • The holographic method provides an approximation of the extinction cross section with errors as low as 1% compared to Mie theory.
    • Particle shape and size can be computationally reconstructed from the recorded hologram.
    • Extinction cross section is obtained simultaneously with particle morphology.

    Conclusions:

    • The proposed holographic technique offers a viable and accurate method for in situ single-particle extinction cross section measurement.
    • This approach integrates particle sizing and shape determination with optical property assessment, enhancing characterization capabilities.