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Single-aperture SLAM microscopy with amplitude-tailored vector beams.

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    This study introduces a simplified single-aperture Switching Laser Mode (SLAM) microscope. This new design achieves super-resolution imaging in living tissues by generating focused spot and donut beams with improved stability and resolution.

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    Area of Science:

    • Optics and Photonics
    • Biomedical Imaging
    • Microscopy

    Background:

    • Super-resolution microscopy is crucial for detailed biological imaging.
    • Conventional Switching Laser Mode (SLAM) microscopy requires complex multi-path setups prone to alignment drift.
    • Achieving deep-tissue, in vivo imaging with super-resolution remains a challenge.

    Purpose of the Study:

    • To develop a simplified, stable, and high-resolution SLAM microscope.
    • To overcome the alignment limitations of traditional multi-path SLAM systems.
    • To enable sub-diffraction-limited imaging in scattering biological tissues.

    Main Methods:

    • Demonstration of a single-aperture, inline SLAM microscope.
    • Utilizing a single phase element and polarization switching to generate colinear vector beams (radially and azimuthally polarized).
    • Tailoring the electric field's spatial profile for optimal spot-like beam resolution.

    Main Results:

    • Achieved a 1.5x narrower focal spot compared to conventional methods.
    • Demonstrated a resolution of approximately 0.28λ (~290 nm).
    • Maintained compatibility with two-photon imaging at depth and in vivo.

    Conclusions:

    • The single-aperture inline SLAM microscope offers a more stable and robust platform for super-resolution imaging.
    • This method significantly enhances imaging capabilities for deep-tissue, live biological samples.
    • Provides a practical approach for sub-diffraction-limited imaging in challenging biological environments.