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Related Concept Videos

Imaging Biological Samples with Optical Microscopy01:18

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Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
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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...
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Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
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Related Experiment Video

Updated: Mar 20, 2026

Stretching Short Sequences of DNA with Constant Force Axial Optical Tweezers
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Nonlinear optical microscopy improvement by focal-point axial modulation.

Mahdi Mozdoor Dashtabi, Reza Massudi

    Journal of Biomedical Optics
    |May 27, 2016
    PubMed
    Summary

    This study introduces a vibrating microscope objective and lock-in amplifier technique to cancel background noise. This enables clearer, deeper noninvasive imaging in scattering biological tissues for microscopy applications.

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    Area of Science:

    • Optical microscopy
    • Biomedical imaging
    • Neuroscience

    Background:

    • Noninvasive, label-free imaging deeper into live scattering samples is a major challenge in microscopy.
    • The signal-to-background ratio limits imaging depth in scattering biological tissues.
    • Current techniques struggle with imaging deep within turbid and scattering media.

    Purpose of the Study:

    • To overcome the limitations of imaging depth in scattering biological samples.
    • To develop a noninvasive and label-free imaging technique for deeper tissue visualization.
    • To enhance signal-to-background ratio for clearer microscopy in turbid environments.

    Main Methods:

    • Utilized a vibrating microscope objective combined with a lock-in amplifier.
    • Implemented background cancellation strategies for optical imaging.
    • Applied the technique to various nonlinear and linear point-scanning optical microscopies.

    Main Results:

    • Demonstrated significant background cancellation in imaging through turbid and scattering media.
    • Achieved clearer images at greater depths within biological samples.
    • Showcased enhanced localization and resolution, resolving signal interpretation ambiguities.
    • Successfully used a single-color laser for the imaging process.

    Conclusions:

    • The vibrating objective and lock-in amplifier technique effectively enhances imaging depth and clarity in scattering media.
    • This method offers a promising solution for noninvasive, label-free deep-tissue imaging in biological and neuroscience research.
    • The technique improves resolution and signal interpretation, applicable to a wide range of microscopy methods.