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    We developed a novel parallel stimulated emission depletion (STED) nanoscope using electro-optical modulators for faster, high-resolution imaging. This technology enables sub-second imaging of biological structures in living cells and fixed samples.

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    Area of Science:

    • Super-resolution microscopy
    • Biophysics
    • Cell biology

    Background:

    • Stimulated emission depletion (STED) microscopy achieves nanoscale resolution but is often limited by slow imaging speeds.
    • Mechanical scanning in traditional STED systems restricts parallelization and increases pixel dwell times.

    Purpose of the Study:

    • To develop a parallel STED nanoscope with no mechanical parts for significantly faster imaging.
    • To achieve sub-millisecond pixel dwell times and high spatial resolution for biological imaging.

    Main Methods:

    • Utilized electro-optical (EO) phase modulators for parallel beam steering and modulation.
    • Implemented a 1225-fold parallelization strategy compared to single-beam STED.
    • Achieved a spatial resolution of 35 nm.

    Main Results:

    • Demonstrated sub-second imaging of nuclear pore complexes in zebrafish (56 nm spatial, 0.2 s temporal resolution).
    • Showcased parallel EO-STED imaging of microtubules in living cells.
    • Revealed nanodomain organization of eukaryotic initiation factors in fixed cells.

    Conclusions:

    • The parallel EO-STED nanoscope overcomes speed limitations of conventional STED microscopy.
    • This technology enables unprecedented temporal resolution for live-cell super-resolution imaging.
    • Future developments promise millisecond STED imaging over large fields of view.