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Related Concept Videos

Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.

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Related Experiment Video

Updated: Jun 16, 2026

Live Cell Imaging of F-actin Dynamics via Fluorescent Speckle Microscopy (FSM)
19:16

Live Cell Imaging of F-actin Dynamics via Fluorescent Speckle Microscopy (FSM)

Published on: August 5, 2009

Speckle reduction using multiple tones of illumination.

N George, A Jain

    Applied Optics
    |February 4, 2010
    PubMed
    Summary

    Speckle noise in imaging can be smoothed using multicolor illumination. This technique enables speckle-free holographic microscopy with diffraction-limited resolution.

    Area of Science:

    • Optics and Photonics
    • Image Processing
    • Biomedical Imaging

    Background:

    • Speckle is a common artifact in imaging systems, particularly with coherent light sources.
    • Understanding speckle occurrence and smoothing is crucial for improving image quality.

    Purpose of the Study:

    • To investigate speckle occurrence and smoothing as a function of illumination line width.
    • To develop a general theory for speckling in partially diffuse objects.
    • To establish the feasibility of speckle smoothing using multicolor illumination.

    Main Methods:

    • Development of a general theory for speckling in partially diffuse objects.
    • Derivation of an expression for wavelength spacing to decouple speckle patterns.
    • Experimental verification using laser and band-limited light sources.

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    Live Cell Imaging of F-actin Dynamics via Fluorescent Speckle Microscopy (FSM)
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    Published on: August 5, 2009

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  • Demonstration of speckle smoothing with multicolor illumination on a diffuser and biological tissue.

    • Main Results:

    • Speckle exhibits laser-like characteristics even with significant line widths (up to 5 Å) for highly collimated sources.
    • Speckle smoothing was successfully demonstrated using six narrow spectral lines spread over 1500 Å.
    • Panchromatic viewing confirmed the smoothing effect.

    Conclusions:

    • Multicolor illumination is a feasible method for smoothing speckle in imaging.
    • This technique can be extended to holographic microscopy for speckle-free, high-resolution imaging.
    • Speckle-free holographic microscopy could significantly advance biological imaging applications.