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Implementation of a Reference Interferometer for Nanodetection
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Microsphere-assisted Fabry-Perot interferometry: proof of concept.

Weicheng Wang, Chunlei Jiang, Shaopeng Tian

    Applied Optics
    |October 18, 2022
    PubMed
    Summary

    We developed microsphere-assisted Fabry-Perot interferometry (MAFPI) for precise microstructure measurement. This novel technique uses photonic nanojets for high-resolution imaging, matching scanning electron microscope results.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Accurate microstructure measurement is crucial for material characterization and device fabrication.
    • Existing high-resolution imaging techniques can be complex and expensive.

    Purpose of the Study:

    • To introduce a novel, cost-effective method for microstructure measurement using microsphere-assisted Fabry-Perot interferometry (MAFPI).
    • To demonstrate the capability of MAFPI for high-resolution scanning imaging.

    Main Methods:

    • Fabrication of MAFPI by stretching single-mode fiber and integrating microspheres of varying sizes and refractive indices.
    • Utilizing the photonic nanojet phenomenon generated by microspheres to create super-focused spots.
    • Performing scanning imaging of optical discs and holographic gratings.

    Main Results:

    • Achieved consistent imaging results for optical discs compared to scanning electron microscopy.
    • Obtained accurate imaging of holographic gratings, validating the technique's precision.
    • Demonstrated the formation of super-focused spots with tunable characteristics via microsphere manipulation.

    Conclusions:

    • MAFPI is a viable and effective technique for high-resolution microstructure measurement.
    • The method offers a promising alternative for applications requiring detailed surface imaging.
    • Photonic nanojets generated by microspheres are key to MAFPI's imaging performance.