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Classical spectral ghost ellipsometry.

Antti Hannonen, Ari T Friberg, Tero Setälä

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    We developed a new ghost reflection ellipsometer for characterizing thin films. This novel method simplifies spectral characterization by eliminating the need for calibration or reference samples, making it more accessible.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Surface Science

    Background:

    • Traditional ellipsometry requires precise calibration and reference samples for spectral characterization.
    • Instrumentation errors and source/detector variations can complicate accurate thin film and interface analysis.
    • Quantum optical techniques offer high sensitivity but can be complex to implement.

    Purpose of the Study:

    • To introduce a novel ghost reflection ellipsometer for spectral characterization of homogeneous thin films and interfaces.
    • To present a classical analog of a quantum twin-photon arrangement that is easier to implement.
    • To develop a method that is insensitive to instrumentation errors and eliminates the need for calibration.

    Main Methods:

    • Utilizes a uniform, spatially incoherent, unpolarized light source with Gaussian statistics.
    • Employs the detection of intensity correlations for analysis.
    • Based on a classical analog of a quantum twin-photon setup.

    Main Results:

    • The ghost reflection ellipsometer enables spectral characterization of homogeneous thin films and interfaces.
    • The method does not require source or detector calibration.
    • No reference sample is needed for the characterization process.
    • The technique demonstrates insensitivity to instrumentation errors.

    Conclusions:

    • The developed ghost reflection ellipsometer offers a simplified and robust approach to thin film and interface characterization.
    • This classical optical configuration is more practical and easier to implement than its quantum counterparts.
    • The method provides accurate spectral characterization without the need for complex calibration procedures or reference standards.