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Related Concept Videos

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Related Experiment Video

Updated: Jul 31, 2025

Visualizing Diffusional Dynamics of Gold Nanorods on Cell Membrane using Single Nanoparticle Darkfield Microscopy
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Hyperlens for capturing sub-diffraction nanoscale single molecule dynamics.

Aleksandr Barulin, Inki Kim

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    |May 9, 2023
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a hyperlens for nanoscale bioimaging, enabling super-resolution fluorescence correlation spectroscopy (FCS) to map lipid dynamics in live cell membranes. The hyperlens achieves sub-diffraction focusing, revealing molecular trapping sites beyond conventional optical limits.

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    Area of Science:

    • Optics and Photonics
    • Biophysics
    • Nanotechnology

    Background:

    • Conventional optical microscopy is limited by diffraction, hindering nanoscale imaging of live cell membrane dynamics.
    • Super-resolution techniques offer higher resolution but can be complex or require specialized equipment.
    • Understanding lipid interactions and molecular trapping sites is crucial for cell membrane research.

    Purpose of the Study:

    • To develop and demonstrate a hyperlens for sub-diffraction fluorescence correlation spectroscopy (FCS) in bioimaging.
    • To enable nanoscale mapping of spatiotemporal heterogeneities in live cell membranes.
    • To assess the feasibility of hyperlens-based FCS for studying molecular dynamics.

    Main Methods:

    • Employing a spherical gold/silicon multilayered hyperlens for sub-diffraction focusing.
    • Utilizing 635 nm excitation wavelength for fluorescence correlation spectroscopy.
    • Simulating diffusion FCS correlation functions to analyze molecular behavior.

    Main Results:

    • Achieved nanoscale focusing of a diffraction-limited beam below 40 nm.
    • Quantified energy localization within the hyperlens to assess FCS feasibility.
    • Demonstrated a reduction in diffusion time by nearly two orders of magnitude compared to free space.
    • Successfully distinguished nanoscale transient trapping sites in simulated 2D lipid diffusion.

    Conclusions:

    • Hyperlenses provide a viable platform for sub-diffraction bioimaging using conventional optics.
    • The developed hyperlens enhances spatiotemporal resolution for studying nanoscale biological dynamics.
    • This technology has significant potential for revealing single-molecule behavior in cell membranes.