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    Surface nanoscale axial photonics (SNAP) technology achieves subangstrom precision for optical fiber devices. A new dynamic fabrication method significantly reduces errors caused by fiber displacement, enabling highly precise SNAP structures.

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    Area of Science:

    • Photonics and Optical Engineering
    • Nanotechnology
    • Materials Science

    Background:

    • Surface nanoscale axial photonics (SNAP) technology enables subangstrom fabrication precision for optical microresonators and photonic circuits on optical fibers.
    • Existing fabrication methods, such as CO2 laser annealing, are prone to errors from temperature fluctuations, parameter inconsistencies, and alignment issues, necessitating complex post-processing.

    Purpose of the Study:

    • To identify and address the primary sources of fabrication errors in SNAP structures.
    • To develop a novel dynamic fabrication method for achieving higher precision in SNAP structures.

    Main Methods:

    • Investigated fiber displacements during CO2 laser beam optical fiber annealing, a key SNAP fabrication technique.
    • Developed and implemented a dynamic fabrication method utilizing translating beam exposure to mitigate misalignment effects.

    Main Results:

    • The dynamic fabrication method effectively suppressed misalignment errors, achieving an effective fiber radius variation of approximately 10 nm with a precision of ~0.1 Å.
    • Identified laser power fluctuations as a potential remaining source of fabrication error.

    Conclusions:

    • The dynamic translating beam exposure method significantly enhances fabrication precision for SNAP structures.
    • Further improvements in SNAP fabrication precision may be achieved by controlling laser power stability.