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High-resolution light-scattering imaging with two-dimensional hexagonal illumination patterns: system implementation

Chih-Wei Chen, Po-Hsun Wang, Li-Jun Chou

    Optics Express
    |October 19, 2017
    PubMed
    Summary

    Structured oblique-illumination microscopy (SOIM) enhances light-scattering imaging contrast and resolution using 2D hexagonal illumination. This advanced technique improves imaging of nanoparticles and cellular structures, enabling dual-mode fluorescence and scattering imaging.

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    Area of Science:

    • Optics and Photonics
    • Microscopy
    • Biophysics

    Background:

    • Structured illumination microscopy (SIM) has been adapted for coherent imaging, creating structured oblique-illumination microscopy (SOIM).
    • SOIM aims to enhance contrast and resolution in light-scattering imaging.
    • Previous SOIM implementations have limitations in achieving laterally isotropic high-resolution imaging.

    Purpose of the Study:

    • To present high-resolution, laterally isotropic SOIM using 2D hexagonal illuminations.
    • To demonstrate the implementation of SOIM in a SIM fluorescence system with a spatial-light modulator (SLM).
    • To investigate the effect of polarization on resolution improvement in SOIM.

    Main Methods:

    • Designed an SLM pattern to generate simultaneous diffraction beams for 2D hexagonal illumination.
    • Calculated optimal SLM shifts across 19 phases for accurate image reconstruction.
    • Utilized linear and circular polarizations to analyze polarization effects on resolution.
    • Derived electric field distributions and developed formulations for coherent-scattering imaging reconstruction.

    Main Results:

    • Achieved two-fold resolution improvement in reconstructed images of 100 nm gold nanoparticles.
    • Demonstrated the effect of polarization on resolving adjacent nanoparticles.
    • Presented high-resolution, improved-contrast images of label-free fixed HeLa cells, showcasing biological applications.
    • Confirmed the capability of SOIM for high-resolution dual-mode imaging.

    Conclusions:

    • Successfully implemented high-resolution, laterally isotropic SOIM with 2D hexagonal illumination.
    • Validated the dual-mode imaging capability (fluorescence and light-scattering) within a single system.
    • The developed SOIM technique is expected to expand the applications of structured illumination microscopy.