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Point-spread function optimization in isoSTED nanoscopy.

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    IsoSTED nanoscopy, a powerful super-resolution technique, can be improved by reshaping its light pattern to eliminate ghost images. New methods using defocus or objective misalignment enhance imaging performance.

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    Area of Science:

    • Optical Microscopy
    • Super-resolution Imaging
    • Nanotechnology

    Background:

    • IsoSTED nanoscopy offers the highest 3D resolution among STED microscopy variants.
    • Axially repetitive side minima in the depletion point-spread function (PSF) cause ghost images, limiting performance.
    • Existing techniques struggle to overcome these limitations in high-resolution 3D imaging.

    Purpose of the Study:

    • To enhance IsoSTED nanoscopy performance by optimizing the depletion PSF.
    • To introduce novel strategies for reducing axial side minima and mitigating ghost image artifacts.
    • To compare the effectiveness of different PSF reshaping methods.

    Main Methods:

    • Reshaping the point-spread function (PSF) of the depletion beam.
    • Employing moderate defocus on the depletion beam to reduce side minima.
    • Implementing a simplified alternative using objective lens misalignment.

    Main Results:

    • Demonstrated reduction of axially repetitive side minima in the depletion PSF.
    • Successfully mitigated ghost image artifacts inherent in IsoSTED nanoscopy.
    • Quantitatively compared the performance of defocus and objective misalignment strategies.

    Conclusions:

    • PSF reshaping offers a viable route to improve IsoSTED nanoscopy.
    • Both defocus and objective misalignment are effective strategies for enhancing 3D resolution and image quality.
    • These advancements pave the way for more robust super-resolution microscopy applications.