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Method for azimuthal alignment in fixed-angle ellipsometry.

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    A new analytical method precisely aligns ellipsometry components without direct light intensity measurements. This technique accurately determines the refractive index of dielectric samples, enhancing optical metrology capabilities.

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    Area of Science:

    • Optical Physics
    • Materials Science
    • Metrology

    Background:

    • Fixed-angle ellipsometry requires precise alignment of optical components.
    • Traditional alignment methods can be challenging, especially when direct intensity measurements are not feasible.

    Purpose of the Study:

    • To develop a novel analytical method for azimuthal alignment of polarizer-analyzer in ellipsometry.
    • To enable accurate alignment without relying on straight-through light intensity measurements.

    Main Methods:

    • Utilized reflection measurements from a dielectric sample at a single angle of incidence.
    • Developed an analytical technique to determine polarizer and analyzer reference positions.

    Main Results:

    • Successfully verified the method using both high-temperature and room-temperature reflectometer systems.
    • Inferred the real part of the refractive index with high accuracy (0.5% and 1.7%).
    • Assessed the technique's sensitivity to polarizer-analyzer settings.

    Conclusions:

    • The developed analytical technique provides an effective solution for azimuthal alignment in fixed-angle ellipsometry.
    • The method offers accurate refractive index determination, applicable in various experimental conditions.