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    Area of Science:

    • Optics and Photonics
    • Spectroscopy
    • Materials Science

    Background:

    • Conventional terahertz-time-domain-spectroscopy (THz-TDS) requires synchronized optical probe pulses.
    • Achieving high dynamic range (DR) in terahertz spectroscopy is crucial for detailed material analysis.
    • Existing methods often rely on complex setups or lock-in amplifiers to enhance DR.

    Purpose of the Study:

    • To develop a high dynamic range (DR) Fourier-transform-based terahertz (THz) spectrometer.
    • To demonstrate a novel THz-PMT based approach for direct electric field interferogram acquisition.
    • To eliminate the need for synchronized optical probe pulses in THz-TDS.

    Main Methods:

    • Integration of a terahertz photomultiplier tube (THz-PMT) with a metasurface and a Michelson interferometer.
    • Utilizing the Fowler-Nordheim equation to govern the THz-PMT's electric-field-dependent response.
    • Direct acquisition of electric field interferograms without external synchronization pulses.

    Main Results:

    • Achieved a dynamic range (DR) of 4.6 × 10^5 in the power spectrum.
    • Successfully obtained the complex refractive index of a quartz glass plate.
    • Demonstrated comparable accuracy to conventional THz-TDS without a lock-in amplifier.

    Conclusions:

    • The proposed THz spectrometer offers a high DR and simplified setup.
    • Direct electric field interferogram acquisition is feasible using THz-PMT technology.
    • This method provides a promising alternative for terahertz spectroscopy applications.