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Roughness determination by speckle-wavelength decorrelation.

D J Schertler, N George

    Optics Letters
    |October 6, 2009
    PubMed
    Summary
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    This study introduces a novel surface metrology technique using wavelength-dependent speckle decorrelation to determine surface roughness and probability density functions. This method allows for precise measurement of surfaces with roughness greater than approximately 1 micrometer.

    Area of Science:

    • Surface science
    • Optical metrology
    • Statistical optics

    Background:

    • Surface characterization is crucial for understanding material properties and performance.
    • Traditional methods for measuring surface roughness can be limited in scope or resolution.
    • Speckle patterns in optics contain rich information about the scattering medium.

    Purpose of the Study:

    • To develop a new optical technique for quantitative surface roughness analysis.
    • To establish a method for determining the probability density function of surface heights.
    • To enable non-contact scanning of surfaces with microscale roughness.

    Main Methods:

    • Utilizing the decorrelation of laser speckle patterns as a function of wavelength.
    • Analyzing the first-order statistical properties of the imaged surface from speckle data.

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  • Employing a tunable dye-laser system to cover an 80-nm wavelength range.

    • Main Results:

    • Demonstrated a technique to calculate surface roughness and probability density functions.
    • Showcased the ability to scan surfaces with root-mean-square (rms) roughness exceeding ~1 micrometer.
    • Established a correlation between speckle decorrelation and surface statistical properties.

    Conclusions:

    • Wavelength-dependent speckle decorrelation is an effective method for surface metrology.
    • The technique offers a viable approach for characterizing rough surfaces beyond the capabilities of some conventional methods.
    • This optical approach provides valuable insights into the first-order statistical properties of surfaces.