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    A new compact terahertz (THz) scanning setup uses two diffractive optical elements for reflective measurements. This design enables efficient focusing and collection of THz radiation, minimizing setup size and maximizing optical element apertures.

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    Area of Science:

    • Optics and Photonics
    • Terahertz (THz) Technology

    Background:

    • Compact optical setups are crucial for advanced imaging and spectroscopy.
    • Terahertz (THz) scanning microscopy requires efficient radiation focusing and collection.
    • Existing reflective THz setups can be bulky, limiting practical applications.

    Purpose of the Study:

    • To design a compact raster terahertz (THz) scanning setup in a reflective configuration.
    • To utilize diffractive optical elements for efficient focusing and collection of THz radiation.
    • To minimize the overall size of the THz scanning system while maintaining large optical apertures.

    Main Methods:

    • Employed two diffractive optical elements (DOEs) for focusing and collection.
    • Implemented an off-axis geometry for the DOEs to achieve a compact design and large apertures.
    • Developed an iterative algorithm to optimize the positioning and performance of the optical elements.

    Main Results:

    • Successfully created a compact raster THz scanning setup.
    • The first DOE focuses THz radiation onto a small spot on the sample.
    • The second DOE collects reflected THz radiation and focuses it onto the detector.
    • Off-axis geometry resulted in a focal spot 100 mm after and 60 mm below the optical axis for a 75 mm diameter element.
    • The iterative algorithm demonstrated potential for further minimization of these spatial parameters.

    Conclusions:

    • The proposed design effectively utilizes diffractive optics for compact THz scanning.
    • The off-axis configuration and iterative algorithm enable miniaturization without compromising optical performance.
    • This compact reflective THz setup is suitable for various material characterization and imaging applications.