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Interferometry-aided terahertz time-domain spectroscopy.

Daniel Molter, Manuel Trierweiler, Frank Ellrich

    Optics Express
    |April 7, 2017
    PubMed
    Summary

    Precise optical delay is crucial for terahertz time-domain spectroscopy. An interferometric technique directly measures this delay, improving terahertz spectra quality even in challenging environments.

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    Area of Science:

    • Optics and Spectroscopy
    • Materials Science

    Background:

    • Terahertz time-domain spectroscopy (THz-TDS) and optical pump-probe techniques require precise optical delay measurements.
    • Traditional methods use mechanical translation, leading to inaccuracies from imprecise mechanics or harsh environments.

    Purpose of the Study:

    • To investigate the impact of optical delay inaccuracies on THz spectra quality.
    • To introduce an interferometric method for direct, simultaneous optical delay acquisition.

    Main Methods:

    • Simulated the effects of delay inaccuracies on THz spectra.
    • Developed and implemented an interferometric technique for real-time optical delay measurement.
    • Integrated the interferometric method with a THz-TDS system.

    Main Results:

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    • Delay inaccuracies significantly degrade THz spectral quality.
    • The interferometric technique provides direct and accurate optical delay measurements.
    • High-precision THz spectroscopy is achievable even in non-ideal conditions.

    Conclusions:

    • Direct interferometric measurement of optical delay is essential for accurate THz-TDS.
    • This method enhances robustness and precision in challenging experimental settings.
    • Enables reliable THz spectroscopy applications in diverse and demanding environments.