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Related Experiment Videos

Periodic sampling errors in terahertz time-domain measurements.

Arno Rehn, David Jahn, Jan C Balzer

    Optics Express
    |April 7, 2017
    PubMed
    Summary
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    Periodic sampling errors in terahertz time-domain spectroscopy (THz-TDS) can significantly distort refractive index measurements. Our study details these errors and their impact, even affecting data beyond the primary bandwidth.

    Area of Science:

    • Physics
    • Spectroscopy
    • Metrology

    Background:

    • Terahertz time-domain spectroscopy (THz-TDS) is a powerful technique for material characterization.
    • Periodic sampling errors are a known, yet often underestimated, source of inaccuracy in THz-TDS measurements.
    • Accurate extraction of optical properties like refractive index is crucial for many THz applications.

    Purpose of the Study:

    • To investigate the origin and impact of periodic sampling errors in THz-TDS.
    • To develop a theoretical model for understanding these errors.
    • To quantify the effect of these errors on refractive index extraction.

    Main Methods:

    • Experimental measurements using a THz-TDS system.
    • Development of a theoretical model to describe periodic sampling errors.

    Related Experiment Videos

  • Comparison of experimental results with theoretical predictions.
  • Analysis of the influence on refractive index calculation.

    • Main Results:

    • Periodic sampling errors were experimentally observed and theoretically modeled.
    • These errors significantly impact the accuracy of the extracted refractive index.
    • Even spectral distortions outside the measurement bandwidth can affect results.

    Conclusions:

    • Understanding and mitigating periodic sampling errors is essential for reliable THz-TDS data.
    • The developed theoretical model provides a framework for error analysis.
    • Precise refractive index determination requires careful consideration of sampling fidelity in THz-TDS.