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Topometry for locally changing materials.

K Leonhardt, U Droste, H J Tiziani

    Optics Letters
    |December 20, 2007
    PubMed
    Summary
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    This study integrates 3D topometry with ellipsometry for precise surface height measurements. The combined technique corrects topographical data by analyzing reflected light phase, improving accuracy for nanoscale surface analysis.

    Area of Science:

    • Optical Metrology
    • Surface Science
    • Nanotechnology

    Background:

    • Accurate 3D surface characterization is crucial for nanotechnology and materials science.
    • Traditional topometry methods can be limited by systematic errors and resolution.
    • Ellipsometry provides optical constants but typically lacks direct topographical information.

    Purpose of the Study:

    • To develop a hybrid optical technique combining 3D topometry and ellipsometry.
    • To enhance the accuracy of 3D surface height measurements by correcting for phase errors.
    • To present a method for calculating optical properties alongside topography.

    Main Methods:

    • Integrating 3D topometry with pixel-synchronized ellipsometric measurements.
    • Utilizing phase shifting and contrast evaluation to determine ellipsometric angles.

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  • Calculating the phase of reflected waves for height field correction.

    • Main Results:

    • Achieved lateral resolution of less than 1 micrometer.
    • Generated 3D fields of ellipsometric angles.
    • Presented corrected topography with calculated real and imaginary parts of the refractive index.

    Conclusions:

    • The combined topometry-ellipsometry approach significantly improves 3D surface height accuracy.
    • This method allows for simultaneous measurement of topography and optical properties.
    • The technique offers enhanced nanoscale surface characterization capabilities.