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Updated: Jan 19, 2026

In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation
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Optical microscopy for measuring tapered fibers beyond the diffraction limit.

Abderrahim Azzoune, Philippe Delaye, Gilles Pauliat

    Optics Express
    |September 13, 2019
    PubMed
    Summary

    This study introduces a novel optical microscopy technique to precisely measure nanofiber radii beyond the diffraction limit. The non-contact method achieves resolutions from a few nanometers up to 50 nm.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Nanotechnology

    Background:

    • Optical microscopy is limited by the diffraction limit for precise nanoscale measurements.
    • Accurate characterization of nanofibers is crucial for various advanced applications.

    Purpose of the Study:

    • To develop and demonstrate a technique for improving optical microscope resolution for nanofiber radius measurements.
    • To achieve sub-diffraction limit resolution for tapered nanofibers.

    Main Methods:

    • A non-contact optical microscopy technique is presented.
    • Experimental diffraction patterns are acquired by scanning the microscope's object plane around the nanofiber.
    • A library of simulated diffraction patterns is used for comparison.

    Main Results:

    • The technique successfully measured tapered fiber radii from 0.4 to 4 µm.
    • Resolution achieved was below the diffraction limit, ranging from a few nanometers to 50 nm.
    • The method is implementable on standard optical microscopes.

    Conclusions:

    • This technique offers a practical solution for high-resolution nanofiber metrology.
    • It extends the capabilities of conventional optical microscopes for nanoscale characterization.
    • The method provides accurate radius determination through diffraction pattern matching.