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Proposal for ellipsometer configurations allowing phase-sensitive detection.

E Masetti, M Montecchi, S E Segre

    Applied Optics
    |February 12, 2008
    PubMed
    Summary
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    New ellipsometer configurations use phase measurements for faster, more accurate polarization analysis. This method enhances signal detection and achieves high time resolution for advanced optical measurements.

    Area of Science:

    • Optical Physics
    • Materials Science

    Background:

    • Ellipsometry is a powerful optical technique for characterizing material properties.
    • Conventional ellipsometry relies on amplitude measurements, which can be susceptible to noise and limit time resolution.

    Purpose of the Study:

    • To propose novel ellipsometer configurations for improved measurement accuracy and speed.
    • To enable determination of ellipsometric parameters (D and psi) using phase measurements.

    Main Methods:

    • Modulating input or output polarization in novel ways.
    • Utilizing phase measurements on two harmonic signal components.
    • Employing a single detector for signal acquisition.

    Main Results:

    • Ellipsometric parameters (D and psi) determined purely from phase measurements.

    Related Experiment Videos

  • Phase measurements demonstrate reduced sensitivity to noise compared to amplitude measurements.
  • Achieved modulation frequencies up to tens of megahertz.

    • Conclusions:

    • The proposed method offers a significant improvement in time resolution for ellipsometry.
    • This technique is suitable for applications requiring rapid optical characterization.
    • Enhanced signal-to-noise ratio and speed are key advantages.