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Related Concept Videos

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Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
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Related Experiment Video

Updated: Mar 12, 2026

Imaging Intermediate Filaments and Microtubules with 2-dimensional Direct Stochastic Optical Reconstruction Microscopy
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Structured illumination behind turbid media.

A Malavalli, M Ackermann, C M Aegerter

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    |November 10, 2016
    PubMed
    Summary
    This summary is machine-generated.

    Researchers can now transform a single light focus into multiple structured focal spots within scattering media. This breakthrough enables advanced imaging and manipulation of microscopic targets inside turbid tissues.

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    Area of Science:

    • * Optics and Photonics
    • * Biomedical Imaging
    • * Soft Matter Physics

    Background:

    • * Light propagation in turbid media is characterized by scattering, scrambling information over the transport mean free path.
    • * Controlling light in scattering environments is difficult but achievable through wavefront shaping.
    • * Previous work demonstrated focusing light through scattering media using feedback-controlled wavefront shaping.

    Purpose of the Study:

    • * To demonstrate the transformation of a single interferometric focus into a structured array of multiple focal spots.
    • * To explore the application of these structured focal spots for imaging and optical manipulation in scattering media.

    Main Methods:

    • * Utilized wavefront shaping techniques with a feedback signal to control light propagation.
    • * Developed a method to convert a single focused spot into a desired multi-spot pattern.
    • * Applied the generated structured illumination for imaging and micromanipulation experiments.

    Main Results:

    • * Successfully generated an array of multiple, structurally defined focal spots within scattering media.
    • * Showcased the capability of these focal spots to serve as structured illumination.
    • * Demonstrated potential for imaging the interior of thick scattering tissues and optical micromanipulation.

    Conclusions:

    • * Wavefront shaping allows for the creation of complex light patterns within scattering media.
    • * Structured focal spot arrays offer a novel approach for advanced applications in turbid environments.
    • * This technique has significant implications for deconvolution imaging and optical micromanipulation.