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Related Concept Videos

Super-resolution Fluorescence Microscopy01:37

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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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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: Oct 24, 2025

Three-dimensional Super Resolution Microscopy of F-actin Filaments by Interferometric PhotoActivated Localization Microscopy iPALM
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Frequency interferometric localization microscopy.

Hedong Liu, Yizhu Zhang, Tiegen Liu

    Optics Letters
    |August 13, 2021
    PubMed
    Summary
    This summary is machine-generated.

    Frequency Interferometric Localization Microscopy (FILM) uses a Michelson interferometer to achieve super-resolution imaging. This novel technique isolates spectral information, enabling molecular-scale spatial resolution by separating nearby fluorophores.

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    Area of Science:

    • Optical Microscopy
    • Spectroscopy
    • Nanotechnology

    Background:

    • Super-resolution microscopy overcomes the diffraction limit for enhanced biological imaging.
    • Existing methods face challenges in resolving densely packed fluorophores.
    • Spectral information of fluorophores is crucial for advanced imaging techniques.

    Purpose of the Study:

    • To introduce Frequency Interferometric Localization Microscopy (FILM), a novel super-resolution technique.
    • To leverage spectral information for improved spatial resolution in fluorescence microscopy.
    • To demonstrate the potential of FILM for achieving molecular-scale resolution.

    Main Methods:

    • Incorporating a Michelson interferometer into a wide-field fluorescence microscope.
    • Utilizing coherence time as an auxiliary axis for spectral information acquisition.
    • Performing time-wavelength transformation to isolate homogeneous linewidths.

    Main Results:

    • FILM successfully isolates individual fluorophore spectra from ensemble broadening.
    • Separation and localization of nearby fluorophores in the frequency domain are achieved.
    • Numerical demonstrations confirm the principle, experimental schematics, and reconstruction algorithm.

    Conclusions:

    • FILM offers a new approach to super-resolution microscopy by utilizing spectral information.
    • The technique has the potential to achieve molecular-scale spatial resolution.
    • FILM provides a pathway for enhanced imaging of densely labeled biological structures.