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Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle
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Noninvasive wavelength estimation through scattering media using recovered point-spread functions.

Kenta Mizuno, Wataru Watanabe

    Applied Optics
    |June 10, 2026
    PubMed
    Summary
    This summary is machine-generated.

    This study presents a noninvasive method to determine light wavelength in scattering media using speckle-correlation imaging (SCI). The technique analyzes point-spread functions (PSFs) to achieve 1 nm wavelength discrimination without direct PSF measurement.

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    Last Updated: Jun 11, 2026

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    Published on: January 3, 2016

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    Measuring Spatially- and Directionally-varying Light Scattering from Biological Material

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    Area of Science:

    • Optics and Photonics
    • Biomedical Imaging
    • Scattering Media Analysis

    Background:

    • Noninvasive wavelength estimation in scattering media is challenging due to speckle pattern decorrelation.
    • Existing methods often require direct measurement or lack precision.
    • Speckle-correlation imaging (SCI) offers a potential avenue for overcoming these limitations.

    Purpose of the Study:

    • To develop and demonstrate a noninvasive technique for estimating the central wavelength of light within scattering media.
    • To utilize speckle-correlation imaging (SCI) and point-spread function (PSF) analysis for wavelength determination.
    • To achieve high-precision wavelength discrimination without direct PSF measurement.

    Main Methods:

    • Acquisition of speckle images using a monochrome camera and broadband LED source, filtered by a liquid-crystal tunable filter.
    • Reconstruction of object images via SCI using hybrid input-output and error-reduction phase-retrieval algorithms.
    • Recovery of point-spread functions (PSFs) using Lucy-Richardson deconvolution and analysis of spectral cross-correlation characteristics.

    Main Results:

    • Successful estimation of the central wavelength of speckle images by analyzing recovered PSFs.
    • Demonstration of 1 nm level wavelength discrimination capability.
    • Validation of the noninvasive approach without requiring direct PSF measurement.

    Conclusions:

    • The proposed SCI-based technique provides an effective noninvasive method for precise wavelength estimation in scattering media.
    • This approach overcomes the limitations of wavelength-dependent speckle decorrelation.
    • The technique holds promise for applications in optical diagnostics and imaging where precise wavelength information is crucial.