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    This study introduces photonic chip-based total internal reflection fluorescence microscopy (c-TIRFM) for super-resolution imaging. The technique achieved 2.2-3.6-fold resolution improvement by utilizing illumination pattern fluctuations with the MUSICAL algorithm.

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    Area of Science:

    • Biophysics
    • Optical Microscopy
    • Nanotechnology

    Background:

    • Photonic chip-based total internal reflection fluorescence microscopy (c-TIRFM) offers a large excitation area decoupled from the detection objective.
    • Wide waveguides in c-TIRFM allow for temporal fluctuations in illumination patterns.
    • The multiple signal classification algorithm (MUSICAL) can leverage fluctuations from various sources, not just emitter emission.

    Purpose of the Study:

    • To demonstrate and verify the use of illumination pattern fluctuations for super-resolution imaging.
    • To apply the MUSICAL algorithm with c-TIRFM for enhanced imaging resolution.
    • To analyze actin structures in salmon keratocytes using this novel approach.

    Main Methods:

    • Utilizing photonic chip-based total internal reflection fluorescence microscopy (c-TIRFM).
    • Implementing the multiple signal classification algorithm (MUSICAL).
    • Introducing and exploiting temporal fluctuations in the illumination pattern.
    • Imaging actin in salmon keratocytes.

    Main Results:

    • Achieved super-resolution imaging by leveraging illumination fluctuations.
    • Demonstrated a resolution improvement of 2.2-3.6 fold compared to conventional imaging.
    • Successfully applied the technique to visualize actin structures.

    Conclusions:

    • Photonic chip-based illumination fluctuations combined with MUSICAL enable super-resolution microscopy.
    • This method provides significant resolution enhancement for biological imaging.
    • c-TIRFM is a promising platform for advanced fluorescence nanoscopy techniques.