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    Terahertz time-domain spectroscopy (TDS) can now determine refractive index without an air reference. This novel echo method reduces errors from laser fluctuations and improves real refractive index accuracy.

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    Area of Science:

    • Physics
    • Materials Science
    • Spectroscopy

    Background:

    • Terahertz time-domain spectroscopy (TDS) is crucial for determining the complex refractive index of materials.
    • Traditional TDS methods rely on an independent air reference scan, which can introduce errors.
    • Laser fluctuations, mechanical drift, and atmospheric absorption are common sources of error in conventional TDS.

    Purpose of the Study:

    • To develop a new method for complex refractive index determination in TDS that eliminates the need for an air reference scan.
    • To reduce experimental errors associated with traditional reference scans.
    • To improve the accuracy and reliability of refractive index measurements using TDS.

    Main Methods:

    • A novel echo reference method is proposed for TDS.
    • This method compares the first transmitted pulse through a sample against its internally reflected 'echo' pulse.
    • The complex refractive index is calculated without requiring a separate scan of air.

    Main Results:

    • The echo reference method was benchmarked against the traditional air reference method.
    • The proposed echo method demonstrated a reduction in variation for the real refractive index.
    • This indicates improved accuracy and stability in refractive index measurements.

    Conclusions:

    • The echo reference method offers a viable alternative to traditional air reference scans in TDS.
    • This technique enhances the robustness of complex refractive index determination.
    • The method shows potential for more accurate material characterization in the terahertz frequency range.