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Related Experiment Video

Updated: Apr 6, 2026

Fabrication and Characterization of High-Q Silicon Nitride Membrane Resonators
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Fabrication and Characterization of High-Q Silicon Nitride Membrane Resonators

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Microsecond-resolved SDR-based cavity ring down ellipsometry.

D Sofikitis, A K Spiliotis, K Stamataki

    Applied Optics
    |July 21, 2015
    PubMed
    Summary
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    We developed a new apparatus for rapid optical measurements using total internal reflection (TIR). This system achieves microsecond resolution, enabling sensitive detection of refractive index changes.

    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Physical Chemistry

    Background:

    • Ellipsometry and absorption spectroscopy are crucial for material characterization.
    • High temporal resolution is needed to study dynamic processes.
    • Existing methods may lack the speed or sensitivity for certain applications.

    Purpose of the Study:

    • To present a novel experimental apparatus for microsecond-resolved optical measurements.
    • To enable simultaneous ellipsometric and absorption measurements.
    • To demonstrate sensing of rapid refractive index variations.

    Main Methods:

    • Utilizing an optical cavity with a Dove prism for total internal reflection (TIR).
    • Implementing software-defined radio technology for data acquisition.

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  • Developing custom drivers for precise control and measurement.
  • Achieving high temporal resolution of at least 2 μs.

    • Main Results:

    • Demonstrated microsecond-resolved ellipsometric and absorption measurements.
    • Successfully sensed rapid variations in refractive index above the TIR interface.
    • Validated the apparatus's capability for long-term, high-resolution measurements.

    Conclusions:

    • The developed apparatus offers a powerful tool for studying fast optical phenomena.
    • The combination of TIR, advanced data acquisition, and optical techniques provides enhanced sensitivity.
    • This technology opens new avenues for real-time monitoring in various scientific fields.