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THz holography in reflection using a high resolution microbolometer array.

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    We developed a digital holographic setup using a Terahertz laser for surface imaging. This technique achieves high resolution and depth sensitivity, showing potential for advanced surface profilometry and video-rate imaging applications.

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    Area of Science:

    • Optics and Photonics
    • Imaging Science
    • Terahertz Technology

    Background:

    • Traditional surface imaging methods face limitations in resolution and depth profiling.
    • Terahertz (THz) imaging offers non-ionizing and penetrating capabilities for various materials.
    • Digital holography provides a powerful framework for wavefront reconstruction and quantitative phase imaging.

    Purpose of the Study:

    • To demonstrate a novel digital holographic setup for Terahertz (THz) imaging of surfaces in reflection.
    • To evaluate the performance of synthetic aperture methods for resolution enhancement in THz holography.
    • To compare different phase retrieval techniques for reconstructing 3D surface information.

    Main Methods:

    • Utilized a high-power continuous wave (CW) THz laser source.
    • Employed a high-resolution (640 × 480 pixel) bolometer detector array.
    • Implemented wave propagation to non-parallel planes and synthetic aperture techniques for surface reconstruction and resolution enhancement.
    • Compared Fourier transform phase retrieval with phase stepping methods.

    Main Results:

    • Achieved a lateral resolution of 200 μm.
    • Demonstrated a relative phase sensitivity of approximately 0.4 radians, corresponding to a depth resolution of 6 μm.
    • Successfully reconstructed object surfaces rotated relative to the detector plane.

    Conclusions:

    • Digital THz holography is a viable technique for high-resolution surface profilometry.
    • The developed setup shows potential for video-rate imaging applications.
    • Synthetic aperture methods and phase retrieval comparisons offer pathways for further performance optimization.