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    Area of Science:

    • Optics and Photonics
    • Terahertz Technology
    • Imaging Systems

    Background:

    • Terahertz (THz) imaging offers unique capabilities for material analysis and security screening.
    • Existing THz systems often face limitations in speed, resolution, and 3D imaging capabilities.
    • The development of advanced THz imaging techniques is crucial for next-generation detection technologies.

    Purpose of the Study:

    • To present a novel terahertz (THz) fast line-scanning imaging system with 3D focus-steering.
    • To demonstrate a lens-less imaging approach for enhanced THz detection.
    • To provide a cost-effective and easily adjustable solution for THz imaging.

    Main Methods:

    • Development of a THz imaging system utilizing a 0.1 THz frequency.
    • Incorporation of a 3D-printed rotating multi-prism plate and a dual-device structure (negative ridge pyramid and column ridge pyramid).
    • Implementation of a line-scanning technique with 3D focus-steering capability.

    Main Results:

    • Generation of a sheet-shaped diffraction-free beam with projection and diffraction-free distances of approximately 175 mm and 200 mm, respectively.
    • Maintenance of a resolution greater than 4 mm within the diffraction-free range.
    • Achieved 3D scanning imaging within a ±22° range.

    Conclusions:

    • The proposed THz lens-less line-scanning system offers significant advantages in working distance and depth of field.
    • The system is a promising candidate for low-cost, easily fabricated, and adjustable THz fast detection and imaging.
    • The approach is adaptable to other THz frequencies by adjusting system parameters.