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Achieving ultra-smooth and damage-free surface through understanding the material removal mechanism of the

Sirui Zhang, Peng Ji, Guanbo Qiao

    Optics Express
    |June 14, 2025
    PubMed
    Summary
    This summary is machine-generated.

    Achieving ultra-smooth optical surfaces is challenging due to material variations. This study uses ion beam figuring (IBF) and molecular dynamics (MD) simulations to understand defect formation and proposes a method for superior surface quality.

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    Area of Science:

    • Materials Science
    • Optical Engineering
    • Surface Physics

    Background:

    • Stringent manufacturing standards for optical components necessitate advanced surface finishing techniques.
    • Surface modification layers enhance polishing precision but can introduce defects during ultra-smooth figuring.
    • Defect structures on modification layers increase surface roughness, limiting machining precision.

    Purpose of the Study:

    • To elucidate material removal mechanisms during ion beam figuring (IBF) on modification layers.
    • To investigate the influence of substrate morphology on modification layer properties and defect formation.
    • To propose and validate a method for ultra-smooth, damage-free fabrication of modification layer surfaces.

    Main Methods:

    • Microscopic characterization techniques to analyze substrate morphology and modification layer properties.
    • Molecular dynamics (MD) simulations to model material removal and sputtering yield variations.
    • Experimental validation of a proposed fabrication method for ultra-smooth surfaces.

    Main Results:

    • Substrate morphology significantly impacts modification layer properties.
    • Variations in modification layer properties lead to localized sputtering yield discrepancies and surface defect formation.
    • The proposed method achieved surface roughness below 0.2 nm RMS on modification layers, maintaining an ultra-smooth and damage-free state.

    Conclusions:

    • Understanding material removal mechanisms in IBF is crucial for defect control.
    • Smooth, defect-free substrates are essential for fabricating high-quality modification layers.
    • The developed method enables ultra-smooth, damage-free optical surface fabrication.