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Three-dimensional interferometric scattering microscopy via remote focusing technique.

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    Remote Focusing-iSCAT (RF-iSCAT) microscopy overcomes limitations in vertical tracking for interferometric scattering microscopy. This new method allows fast, vibration-free 3D imaging of nanoscale objects without moving the sample or objective lens.

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    Area of Science:

    • Optical microscopy
    • Nanoscale imaging
    • Biophysics

    Background:

    • Interferometric scattering (iSCAT) microscopy offers high resolution for tracking nanoscale objects and label-free biomolecule imaging.
    • Current iSCAT methods face challenges with slow 3D imaging and restricted vertical tracking capabilities.

    Purpose of the Study:

    • To introduce Remote Focusing-iSCAT (RF-iSCAT) microscopy for enhanced 3D imaging of volume specimens.
    • To overcome the limitations of traditional iSCAT in vertical tracking and imaging speed.

    Main Methods:

    • Developed a novel RF-iSCAT technique that images different depths without translating the objective lens or sample stage.
    • Demonstrated the principle by determining the z-position of submicrometer beads through reference mirror translation.

    Main Results:

    • RF-iSCAT enables visualization of volume specimens by imaging sections at varying depths.
    • Achieved an unprecedentedly long range of vertical tracking.
    • Facilitated fast, vibration-free vertical scanning capabilities.

    Conclusions:

    • RF-iSCAT significantly enhances the utility of iSCAT microscopy for studying dynamics.
    • The method provides a new approach for high-resolution 3D imaging of nanoscale dynamics.