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  1. Home
  3. Subwavelength 3d Terahertz Imaging With A Single-pixel Laser Transceiver.
  1. Home
  3. Subwavelength 3d Terahertz Imaging With A Single-pixel Laser Transceiver.

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Subwavelength 3D terahertz imaging with a single-pixel laser transceiver.

Jorge Silva, Martin Plöschner, Karl Bertling

    Optics Express
    |June 14, 2025

    View abstract on PubMed

    Summary
    This summary is machine-generated.

    This study introduces a novel single-pixel terahertz imaging system using laser feedback interferometry. It achieves significantly enhanced resolution for non-destructive material inspection, surpassing conventional methods.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Imaging Technology

    Background:

    • Terahertz (THz) imaging offers non-destructive material inspection capabilities.
    • Practical THz imaging is hindered by resolution limitations, particularly in lateral and axial dimensions.

    Purpose of the Study:

    • To develop a single-pixel THz imaging system with enhanced resolution beyond conventional limits.
    • To demonstrate the potential of laser feedback interferometry for high-fidelity THz imaging.

    Main Methods:

    • A single-pixel THz imaging system was designed using a confocal microscope architecture.
    • A quantum cascade laser served as both transmitter and phase-sensitive receiver.
    • Laser feedback interferometry was employed for phase-sensitive detection and imaging.

    Main Results:

    • Achieved a twofold improvement in lateral resolution (to λ/2) and a two-order-of-magnitude enhancement in axial resolution (to beyond λ/5).
    • Generated a 0.5 megapixel image in under three minutes, outperforming existing THz imagers.
    • Enabled simultaneous amplitude and phase image acquisition with a custom visualization method for enhanced material characterization.
    • 3D tomographic analysis revealed subwavelength features in a silicon chip.

    Conclusions:

    • The developed system overcomes diffraction limits for THz imaging.
    • Demonstrated rapid, high-fidelity imaging of subwavelength features, advancing non-destructive material analysis.
    • Laser feedback interferometry is a promising technique for next-generation THz imaging systems.