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    We developed a fast, compact Terahertz 3D imager using compressed sensing and an oscillating delay line. This technology enables rapid, high-resolution imaging for industrial, security, and biomedical applications.

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    Area of Science:

    • Optics and Photonics
    • Spectroscopy
    • Imaging Technology

    Background:

    • Terahertz (THz) imaging is valuable for nondestructive evaluation, security, and biomedical diagnostics due to its unique spectral fingerprinting and penetration capabilities.
    • Existing THz focal plane arrays are costly and lack resolution, while scanning-based THz-time-domain spectroscopy (TDS) systems are slow and bulky.

    Purpose of the Study:

    • To present a compact, high-speed single-pixel THz 3D imager (THZ-TOFSPI) that overcomes the limitations of current THz imaging technologies.
    • To demonstrate a novel system integrating a DMD-based spatial encoder and an ultra-stable voice-coil-motor-driven oscillating delay line (VCM-ODL).

    Main Methods:

    • Integration of a Digital Micromirror Device (DMD) for optically controlled THz spatial encoding.
    • Implementation of an ultra-stable voice-coil-motor-driven oscillating delay line (VCM-ODL) for rapid THz-TDS sampling.
    • Application of compressed sensing algorithms to reconstruct 3D images from sparse data.

    Main Results:

    • Achieved THz-TDS sampling rates of up to 120 Hz with high amplitude and phase stability.
    • Demonstrated 3D imaging of a 16x16 pixel target in 5.3 seconds, over 1000 times faster than traditional point-scanning THz-TDS.
    • Developed a lightweight and scalable THz imaging system.

    Conclusions:

    • The THZ-TOFSPI system offers a significant advancement in speed and compactness for THz 3D imaging.
    • The technology holds potential for large-area, high-resolution 3D imaging in industrial inspection, security screening, and biomedical applications.
    • Future integration into robotic, handheld, and wearable platforms is feasible.