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Super-resolution imaging based on cascaded microsphere compound lenses.

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    A novel cascaded microsphere compound lens (CMCL) enhances microscope imaging. This new lens design achieves higher resolution by narrowing the photon nanojet waist, enabling detailed observation of nanoparticle arrays.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Nanotechnology

    Background:

    • Microsphere lenses offer unique optical properties for microscopy.
    • Achieving high resolution and wide field of view simultaneously remains a challenge in microsphere-based imaging.

    Purpose of the Study:

    • To introduce and characterize a cascaded microsphere compound lens (CMCL) for improved microscopic imaging.
    • To demonstrate the CMCL's ability to enhance resolution and field of view compared to single microspheres.

    Main Methods:

    • Fabrication of CMCLs using barium titanate glass (BTG) primary microspheres and polystyrene (PS) secondary microsphere arrays.
    • Characterization of the field of view (FOV) dependence on BTG microsphere size.
    • Adjustment of the photon nanojet (PNJ) waist using PS microsphere size for resolution enhancement.
    • Experimental observation of a 200-nm-diameter PS nanoparticle array using the CMCL.
    • Quantification of imaging resolution using the point spread function.

    Main Results:

    • The CMCL design allows for adjustable PNJ waist, directly impacting imaging resolution.
    • A CMCL achieved a magnification of ~11.6× and a FOV of ~14 µm.
    • The CMCL successfully imaged a 200-nm-diameter hexagonally close-packed PS nanoparticle array, which was unobservable with a single BTG microsphere.
    • The FOV is determined by the primary BTG microsphere size.

    Conclusions:

    • The CMCL is an effective tool for improving imaging resolution in microsphere-assisted microscopy.
    • Cascading microspheres allows for independent control over FOV and PNJ waist, leading to superior imaging performance.
    • Well-designed CMCLs hold potential for advanced nanoscale imaging applications.