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    We adapted optical structured-illumination imaging for terahertz (THz) imaging. This technique uses moving THz fringes to reconstruct images, demonstrating a new method for THz sensing.

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    Area of Science:

    • Physics
    • Optical Engineering
    • Terahertz Technology

    Background:

    • Structured-illumination imaging (SII) is a powerful optical microscopy technique.
    • Migrating SII to other spectral domains like terahertz (THz) presents unique challenges.
    • Existing THz imaging methods often lack spatial resolution and flexibility.

    Purpose of the Study:

    • To demonstrate the feasibility of adapting structured-illumination imaging to the terahertz domain.
    • To develop a novel Fourier-basis THz imaging technique.
    • To showcase a proof-of-concept for THz Fourier-basis agile structured illumination sensing imaging.

    Main Methods:

    • Generated near-infrared (NIR) laser fringes using an acousto-optic Bragg cell.
    • Used a semiconductor wafer as an optically addressed spatiotemporal modulator for THz beams.
    • Created programmable THz diffraction gratings from optical fringes.
    • Collected scattered THz radiation in a light bucket receiver.
    • Reconstructed images using Fourier analysis of the detected signals.

    Main Results:

    • Successfully projected controllable sinusoidal THz fringes onto a target.
    • Demonstrated the semiconductor modulator's performance against a model.
    • Presented initial Fourier-reconstructed images of point targets in the THz domain.
    • Validated the concept of THz Fourier-basis agile structured illumination sensing imaging.

    Conclusions:

    • Structured-illumination imaging principles can be successfully translated to the terahertz spectral range.
    • The developed technique offers a new approach for THz imaging with potential for high spatial resolution and flexibility.
    • This work represents a significant step towards advanced THz sensing and imaging applications.