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    Area of Science:

    • Terahertz (THz) imaging
    • Optical engineering
    • Signal processing

    Background:

    • Terahertz imaging offers unique capabilities for material analysis and security screening.
    • Existing terahertz imaging systems often face limitations in speed and resolution.
    • Advancements in single-pixel imaging techniques are crucial for overcoming these limitations.

    Purpose of the Study:

    • To develop and validate a high-speed terahertz single-pixel video imaging system.
    • To improve imaging speed, resolution, and computational efficiency compared to existing methods.
    • To demonstrate the system's potential for real-time imaging applications.

    Main Methods:

    • Utilized Hadamard and Fourier encoding schemes with a Si3N4/Si wafer modulator.
    • Achieved a modulation bandwidth of 6 kHz.
    • Implemented comprehensive theoretical modeling and experimental validation.

    Main Results:

    • Attained subwavelength resolution of 1 mm and signal-to-noise ratios exceeding 20.
    • The Fourier method enabled video-rate terahertz imaging with high peak SNR and structural similarity.
    • Successfully demonstrated real-time detection of metal targets within paper.

    Conclusions:

    • The developed terahertz single-pixel imaging system significantly enhances imaging speed and quality.
    • The system shows great promise for practical applications such as remote sensing and nondestructive evaluation.
    • Further optimization of sampling and reconstruction will improve frame rates and target recognition accuracy.