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Pinholes in Al/MgF2.

Xiaodong Wang, Peng Zhou, Shuai Ren

    Applied Optics
    |May 3, 2023
    PubMed
    Summary

    Researchers have directly observed pinholes in Aluminum/Magnesium Fluoride (Al/MgF2) layers for the first time using microscopy. This finding is crucial for advancing ultra-precise optics in fields like gravitational wave detection.

    Area of Science:

    • Materials Science
    • Optics
    • Surface Science

    Background:

    • Pinholes in Al/MgF2 layers were previously inferred but lacked direct observational proof.
    • Existing research suggested transmittance enhancement due to these defects.

    Purpose of the Study:

    • To provide direct visual evidence of pinholes in Al/MgF2 thin films.
    • To characterize the size and nature of these observed pinholes.
    • To understand the factors influencing pinhole formation.

    Main Methods:

    • Dark-field microscopy in transmission mode.
    • Bright-field microscopy in transmission mode.

    Main Results:

    • Direct observation of pinholes, ranging from several hundred nanometers to several micrometers.

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  • Pinholes were found to be incomplete defects, lacking sufficient Al element.
  • Pinhole size was not reduced by increasing Al film thickness.
  • Pinhole formation depended on Al deposition rate and substrate heating temperature, but not substrate material.

    • Conclusions:

    • This study provides the first direct observation and characterization of pinholes in Al/MgF2.
    • Understanding pinhole formation is essential for eliminating scattering sources in optical coatings.
    • The findings will contribute to the development of advanced optical systems for applications such as gravitational wave detection and coronagraphy.