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Compact and stable THz vector spectroscopy using silicon photonics technology.

Jae-Young Kim, Hidetaka Nishi, Ho-Jin Song

    Optics Express
    |March 26, 2014
    PubMed
    Summary

    We developed a compact terahertz (THz) vector spectroscopy system using silicon photonics. This new system offers enhanced stability and a reduced footprint for THz wave analysis.

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    Area of Science:

    • Photonics and Spectroscopic Technology
    • Integrated Optics
    • Terahertz Science

    Background:

    • Traditional terahertz (THz) spectroscopy systems are often bulky and sensitive to environmental phase fluctuations.
    • Achieving precise phase control in THz spectroscopy is crucial for accurate vector measurements.
    • Silicon photonics offers a pathway to miniaturize and stabilize optical systems.

    Purpose of the Study:

    • To develop a compact and environmentally stable THz vector spectroscopy system.
    • To leverage silicon photonics for enhanced phase control and system miniaturization.
    • To demonstrate the performance of the integrated THz vector spectrometer.

    Main Methods:

    • Utilized silicon photonics to create an integrated phase control circuit.
    • Employed differential lightwave phase control with two carrier-injection electro-optic modulators.
    • Implemented fast and linear phase sweeps for THz-waves.
    • Demonstrated a THz vector spectrometer based on the silicon-photonic circuit.

    Main Results:

    • Achieved a significant reduction in the physical size of the continuous-wave THz spectroscopy system.
    • Enhanced environmental phase stability, with phase variation less than ± 10° without thermal packaging.
    • Demonstrated high dynamic ranges of 65 dB at 300 GHz and 35 dB at 1 THz with a 1-ms integration time.

    Conclusions:

    • The developed silicon-photonic THz vector spectroscopy system is compact and highly stable.
    • The integrated phase control circuit enables robust and precise THz vector measurements.
    • This technology paves the way for more accessible and portable THz spectroscopic applications.