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Multimode interference dynamic light scattering.

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    This study introduces a novel fiber-based interferometer that enhances signal collection from dynamic scattering systems. The method achieves high signal-to-noise ratios, comparable to pure single-mode systems, enabling better analysis of complex optical properties.

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    Area of Science:

    • Optics and Photonics
    • Complex Systems Analysis
    • Interferometry

    Background:

    • Dynamic scattering systems require strong signals and high signal-to-noise ratios (SNR) for effective analysis.
    • Spatially coherent measurements yield the highest SNR, while partial coherence aids spatial averaging.
    • Existing methods face challenges in balancing signal strength, SNR, and spatial averaging in dynamic systems.

    Purpose of the Study:

    • To present a robust, fiber-based interferometer for dynamic scattering systems.
    • To demonstrate efficient light collection from larger coherent regions while maintaining high SNR.
    • To enable access to effective optical properties of complex dynamic systems.

    Main Methods:

    • Implementation of a fiber-based, single-mode, common-path interferometer.
    • Assistance of the interferometer with multimode interference.
    • Development of a stable local oscillator encoding information on the fiber-medium interface.

    Main Results:

    • Achieved efficient light collection from larger coherent regions.
    • Maintained high SNR comparable to pure single-mode arrangements.
    • Established a linear dependence on scattering density.

    Conclusions:

    • The developed interferometer offers a robust solution for dynamic scattering systems.
    • The system allows for simultaneous high SNR and effective spatial averaging.
    • The method provides access to crucial optical properties of complex dynamic media.